Search

Search Results

##search.searchResults.foundPlural##

FarmHouseholds’ Adaptation StrategiestoClimate Change in the Northwest Mountainous Region, Vietnam

Dang Nam Phuong, Vu Tien Vuong, To The Nguyen

Received: 06-12-2021 / Accepted: 15-08-2022
The study was carried out to determine the level of application of adaptation measures and analyse the factors affecting farmers’choice fordifferent levels of adaptation measures to climate change in the Northwest region. The study site is one of the areas most vulnerable to climate change because most people have the main sourceof income from agricultural production. Primary data werecollected by direct interviewon 438 farmer households through questionnaires. The multivariable logit regression model was used to estimate the influence of the household's socio-economic factors on the level of application of 3 mainsolutionsthat are most frequently applied by surveyed households. The results show that the education level, number of members, agricultural land area and total income from agriculture of the household were the main factors affecting the household's application of adaptation measures. Therefore, the study recommends solutions to raise people's awareness and diversify incomes to minimise impacts of climate change.
Adaptation to Climate Change in Agricultural Production of Farmer Householdsin Moc Chau District, Son La Povince

Bui Thi Khanh Hoa, Nguyen Dang Hoc

Received: 06-04-2023 / Accepted: 21-06-2023
This study aimed to reflect the situation of climate change and adaptation measures to climate change of farmer households in agricultural production in Moc Chau district.Primary data were collected through questionaires interviewing with 120 farmer households directly involved in agricultural production activities and in-depth interviews with 10 local staffs. The research results showed that to adapt many changes in local climate such as temperature and humidity raising, rainfall, sunshine hours reduction... as well as extreme weather phenomena such as chilling cold, biting cold, storms, floods, hails, hoarfrost..., Moc Chau farmer households have also taken several adaptationmeasures. These measures included shifting structure of crops and livestock, applying new varieties, adjusting farming techniques, repairing barns, moving cages, dredging mud, applying advanced technology to production, diversifying livelihoods... However, there were low application rate and non-homogeneous among households. The study also proposed some recommendations to improve adaptation to climate change in agricultural production of farmer households in Moc Chau in the near future.
Adaptation to Climate Change in Agricultural Production of Local People in Coastal Giao Thuy District, Nam Dinh Province

Dang Thi Hoa, Quyen Dinh Ha

Received: 18-06-2014 / Accepted: 01-09-2014
Climate change is one of the phenomena that has a strong impact on the nature and human life in many countries, including Vietnam. The extreme weather phenomenon such as prolonged heat, coldness, floods, droughts, sea level rise...have impacted negatively on agricultural production activities, particularly in coastal areas. Giao Thuy district is one of Nam Dinh province's coastal areas, which has abundant and various resources and good conditions to facilitate development of agricultural production. However, the district at the same time faces withseveralthreats and risks caused by storms, floods, tides, sea level rise..., causing tremendous damage to infrastructure and human lives. To respond to climate change, local governments and citizens in Giao Thuy district have takencertain actions to adapt with the climate change to develop agricultural production. This articleprovidesthe first impact assessment of climate changein Giao Thuy district, with emphasison agricultural production and adaptation measures used in agricultural production in Giao Thuy district, Nam Dinh province. Some measures to enhance adaptive capacity of communities to prevent and minimize harm, stability and development of agriculture in climate change conditionswere also recommended.
Evaluation of Some Agrobiological Characteristics and Drought Tolerance of Imported Rice Lines in Thua Thien Hue province

Tran Minh Quang, Tran Dang Hoa, Truong Thi Hong Hai, Dinh Ho Anh, Tran Thi Phuong Nhung

Received: 05-11-2018 / Accepted: 25-12-2018
This study assesseddrought tolerance and some agro-biological characteristics of rice lines imported from International Rice Research Institute (IRRI) in Thua Thien Hue province with experiments conducted in laboratory induced drought condition and on rice field with non-active irrigation. The results of laboratory induced drought experiment showedthat introduced rice lines from IRRI hadthe germination rate in the range of 39,57-89,67% when KClO3 2% solution was used, the radicle length variedfrom 0,64cm to 3,07cm. Some of varieties showedsignificant drought tolerance when there was no watering during seedling stage and branching stage. The results of experiments on field with no irrigation showedthat the introduced rice lines from IRRI hadgrowth duration varying from 111 to127 days and belonged to medium and long-day plant group; plant heights varyiedfrom 73,5 to 122,3cm; vegetative tiller was in the range of 9,2-21,2 tillers; effective tiller was 6-17tilers. The productivity factors and theoretical productivity were relatively high in some rice varieties. Most of the rice varieties showedgood adaptation to drought in the condition of non-active irrigation in Winter-Spring crop in Thua Thien Hue province.
Impacts ofClimate Change on Gender Role in Agricultural Production: ACase Study in Giao Lac, Giao Thuy, Nam Dinh

Nguyen Tat Thang, Nguyen Thi Huong Giang, Ngo The An

Received: 31-01-2015 / Accepted: 17-05-2015
Using gender analysis approach and participatory methodologies, thestudy aims to find out impacts of climate changeon gender rolesin agricultural production to propose appropriate solutions for gender equity in climate change (CC) adaptation and disaster mitigation policy at local level. The study found, CC and disasters produced high pressure for Giao Lac commune. Due to gender role, the impacts of CC on men and women were different. Study results pointed out the positive change of society perception in the role of women. They participatedin decision making of nearly 70% solutions for CC adaption in horticulture and livestock, and100%in financial solutions. However, improving the role of women in production and CC adaptation activities, accompanying with burden of housework and other gender gap might increase gender inequality in Giao Lac Commune. Thus, this study proposed thatlocal government and other stakeholdersshould take gender equality into account for any CC adaption or mitigation policy or plan which is being or will be implemented in this commune.
Identification of Drought-tolerant Lines and Local Cultivars for Development Genetic Material and Rice Breeding for Rainfed Environment

Nguyen Thi Hao, Dam Van Hung, Pham My Linh, Vu Quoc Dai, Le Thi Hau, Dong Huy Gioi, Vu Van Liet

Received: 02-02-2013 / Accepted: 18-04-2013
Drought is a major constraint affecting rice production, especially in rainfed areas of mountainous regions of Vietnam. Development of drought tolerant varieties will improve rainfed rice production. Identification of drought-tolerance of the lines and local cultivars is useful for the development of genetic material and rice breeding for adaptation to rainfed environments. Forty two rice accessions were evaluated for germination and seedling characteristics by treatment of rice seed with KClO3. The plants were planted in PVC pipe to evaluate root length and root growth under well-watered and water-stressed environments. In addition, QTLs associated with root lengthen and root growth were analyzed using SSR markers. We have identified 11 accessiopns (lines and local cultivars) with drought tolerance. Three best drought tolerant accessions, 455 (Khau li on/Q5), 464 (Mua chua, Dien Bien) and 487 (Khẩu lếch, Bak Kan) are recommended for rice breeding program for rainfed environment.
Effects of Drought on Growth and Dry Matter Accumulation of Barley (Hordeum vulgare L.) at Seedling Stage

Nguyen Viet Long, Vu Thi Hong, Nguyen Van Loc, Nguyen The Hung, Dinh Thai Hoang

Received: 28-03-2014 / Accepted: 22-05-2014
This study was conducted to determine the effect of drought on several physiological and morphological traits of barley at seedling stage. Factorial experiment including 9 barley genotypes with constrasting salinity tolerance capacity at seedling stage, and 3 water regimes was laid out in a completely randomized design with 3 replications. Drought was imitated by maintaining the soil moisture contents during 2 weeks since 14 days after sowing. The data were collected for plant height, the number of leaves, the number of tillers, leaf area and dry matter accumulation. The results showed that drought at seedling stage significantly reduced plant height, number of leaves, leaf area, number of tillers and dry matter accumulation of barley genotypes. BCC884 and BCC438 were best genotypes for drought adaptation. Using the characterized salt tolerance varieties, the results in the current study was used to discuss the relationship between drought and salinity tolerance ability at seedling stage. This could be useful information to research on physiological and molecular mechanisms of tolerance to osmotic stress found in drought and salinity stress.
Intake, Digestibility and Feed Conversion of Some Protein-Rich Forages in New Zealand White Rabbits

Nguyen Van Dat, Tran Hiep, Nguyen Xuan Trach

Received: 06-01-2015 / Accepted: 18-04-2015
Afeeding trial was carried out to evaluate feed intake, digestibility and feed utilisation of some protein-rich forages by New Zealand White growing rabbits. A total of 24 growingmale rabbits at 8 weeks of age (1.53± 0,13 kg) wereused for a 4x4 latin square experiment repeated twice, using 4 feeds (Trichanthera gigantea, Ipomoea aquatica, Ipomoea batatas and concentrate pellet) in 4 experimental periods (each period lasted 14 days with 7 first days for adaptation and 7 last days for data collection). Results show that the protein-rich forages were ingested in equal amount(5.66-5.87%BW), buthigher than that of the concentrate pellet (5.27%BW). The highest intakes of ME and CPwere the concentrate pellet and Ipomoea aquatica, respectively. Digestibility was also highest for concentrate pellet, followed by Ipomoea aquatica, Trichanthera gigantea and Ipomoea batatas. Among the protein-rich forages, Trichanthera gigantea gave the highest ADG (23.5g) and and best FCR (4.6 kg DM/kg weight gain), Ipomoea aquatic andIpomoea batatasgave similar ADGs (20g) and FCRs (5.1-5.2 kg DM/kg weight gain).
Selection of Three Line Hybrids ofRice Introducedfrom China

To Huu Sy, Tran Van Quang, Nguyen Thi Hao

Received: 12-08-2014 / Accepted: 21-04-2015
The three line hybrid rice combinations introducedfrom China which were evaluated in 2012 springand summerseason. Thehybrids hadgood plantype, high tillers, acceptable yieldand goodquality. The selection ofpromissing combination(s)was based on agronomical traits and morphological traits, such as growth period, yieldattributingcharactersand actual yield. As a result,Vinh uu 366(33F1)was selected for itsshort growth duration (115 days in the season), high yield (6,8tons/ha), and good quality. Thispromissing hybridshould be further tested for the ecological adaptation in other areas in order to release as new variety.
Effects of Tea Tannin on Performance and Methane Emissions from Lactating Dairy Cows

Tran Hiep, Pham Kim Dang, Nguyen Ngoc Bang, Chu Manh Thang

Received: 13-10-2015 / Accepted: 03-05-2016
The effects oftannin from tea residueon the nutrient intake, milk yield, feed utilization efficiency, and the level and intensityof methane emissions (CH4) of lactatingdairy cows were investigatedin two experimental periods (from Feb to May and from Jun to September 2015), each period lasted 105 days (including: 15 days for adaptation + 90 days for data collection). In each experimental period, 12lactating Holstein Friesian cows with an average body weight of 557.27 kg at 3-5thlactating months, 2-6th lactation cycles and milk yield of 22.13 l/head/day were randomly allocated into a randomized complete block design comprising 4 treatments. Thecontrol group receivedbasal diet)and, three other experiment groups were added with three different levels of tannin (% DM, i.e.Group T0.3: basal diet + 0,3% tannin,group T0.5 : basal diet + 0.5% tannin,and group T0.7 : basal diet + 0.7% tannin. The basal diet composed of corn silage (14 kg/d) + tender corm stove (29 kg/d) + TMR feed (5 kg/d) + alfafa (5 kg/d) + concentrate ((milk yield - 5) x 0.5 kg/d) + natural grass (ad libitum). Tannin was directly supplemented from tea residue based on its tannin level. Results showed that tea tannin supplement increased ME intake (by 1.15%, 1.96% and 5.7%) and CP intake (by 1.49%, 2.99% and 7.09%) corresponding to T0.3, T0.5 and T0.7 diets, compared with the control. Tannin supplements at 0.3% and 0.5% levelshad no effect on digestibility but reduced digestibility at 0.7% level (by 5-10% depending on different nutrients). Tannin supplement increased milk yield (by 4.59%, 8.93% and 8.74% corresponding to T0.3, T0.5 and T0.7 diets) (P<0.05). In contrast, tannin supplement reduced total methane emissions (by 7.47%, 22.77% and 8.62%) and methane emissions intensity calculated as L/kgdry matter intake (DMI) by 8.40%, 24.06%, 17.50% or as L/kgfat corrected milk (FCM) by 20.70%, 31.58%, and 18.36% (P<0.05). As a result, tannin supplement at 0,5% DMI improved animal performance and environment efficiency.
Assessing Ecological Adaptation of Soil - Geomorphology Landscape for Development of Red Flesh Dragon Fruit Long Dinh No.1 on the Basement of Ba ViMountainous Area, Ba Vi District, Hanoi

Received: 08-08-2016 / Accepted: 20-11-2016
By assessing the relationship between the geomorphological process and soil process and comprehensive assessment of natural conditions at the basement of Ba Vi mountainous area, the study has indentified suitable areas for developing red flesh dragon fruit cv. Long Dinh No.1. The obtained results showed that five soil - geomorphology landscape units covering a total area up to 6,645.3 ha are suitable for planting cv. Long Dinh No.1, accounting for 33,32% of the total natural area in Ba Vi district, of which, the most suitable area occupied 5,691 ha (CQ20, CQ22, CQ23, CQ26).
Appication of Decision Tree Technique in Land Suitability Classification for Rubber in Dau Tieng District, Binh Duong Province

Nguyen Huu Cuong

Received: 15-11-2017 / Accepted: 16-01-2018
Decision tree is a powerful and effective tool in classifying and forecasting. The decision tree method gives quantitative bases for land suitability classification. The analysis of survey data indicated several factor combinations according to plant average productivity and based on productivity, the adaptation level for each factor combination. Was assessed. Regression model of decision tree in this study included two kinds of variables: the target variable was the productivity (t/ha) and the predictor variables consisted of soil types, soil depth, slope and texture. This study was applied for rubber trees and conducted in Dau Tieng district, Binh Duong province. The study showed that the interpretation level of the predictive variables was 97.58%. The moderately suitable area was 60,850.65 hectares, and marginally suitableare was 6,332.97 ha.
Gross and Microscopic Morphology of Salt Glands in Sea Duck 15 Dai Xuyen

Vuong Lan Anh, Nguyen Van Duy, Hoang Van Tieu, Nguyen Thi Minh Phuong, Nguyen Ba Tiep

Received: 11-06-2018 / Accepted: 11-03-2019
Gross and histological structures of the salt glands of the sea duck 15 (VB15) and the F1(VB15 x mallards) ducklingswere investigated in this study. The ducks hadbilateral crescent salt glands under the skin in the supraorbital depression of the frontal bone. The measurements of the gland length, width and weight showed that the gland development wasfaster from post-hatching to 6 weeks of age. There were no differences of the three values among three duck groups raised in fresh water. The salt glandsof VB15 raised in sea water had higher weight than that of the counterparts in fresh water. The glands of VB15 consistedof concentric polygonal lobes arranged in rows and separated by interlobular connective tissuesthat contain vasculature system. Each lobe hadbranched striated secretory tubules lining with single layer of cuboidal cells. Connective tissue was underneath the cuboidal cellepithelia. Thebranchedductsopenedinto the central canal that drain in a main duct leads to the anterior of the nasal cavity. This is the first study on salt glands of Vietnam marine animals, especially of VB15breedand can be considered as the basisfor further studies on age-dependent functions of the salt glands and theoptimal age of VB15 for shifting from fresh water to salty water as well as appropriate salinity for VB15.
Maize Root Development under Hypoxia and Waterlogging Conditions

Nguyen Van Loc, Pham Quang Tuan, Nguyen Viet Long

Received: 27-12-2018 / Accepted: 21-03-2019
Waterlogging is a major environmental stress limiting maize yield in the monsoonal areas of Asia, as well as in other parts of the world. The objective of this study was to evaluate thephenotypic variation in root development under hypoxia condition at the seedling stageofdiverse maize inbred lines in 0.1% agar-hydroponic culture. The root length (RLD), root surface area (RSAD) and root volume (RVD) under hypoxia wereinvestigated by means of WinRHIZO analysis before and after the treatment. Based on the evaluation results of 30 lines under hypoxia, root development of15 selected lines was also evaluated in soil culture. Significant phenotypic variation in hypoxia tolerance in roots was observed among studiedmaize lines. Root developmentin hydroponic and soil culture wassignificantly correlated. The results suggested that nine potential lines (VNT2, VNT3, VNT7, VNT9, VNT12, VNT13, VNT14, VNT24 và VNT25)hada high ability to develop roots under hypoxia. These resultsprovide insights into the mechanisms of waterlogging adaptation and the hypoxia tolerant materials can be usedto improve the waterlogging tolerance of modernmaizecultivars at the seedling stage.
Prediction ofWater Requirementsfor Land Use Types in Srepok River Basinin the Context of Climate Change

Nguyen Thi Ngoc Quyen

Received: 30-11-2018 / Accepted: 11-04-2019
In agricultural production, irrigation water is at the forefront, especially in the context of climate change. The objective of this study wasto predictthe irrigation waterrequirementsfor the major land use types in the Srepok basin and to propose agricultural land-use planning to support decision makers in integrated river basin management towards sustainable development. The modeling approach under thesupport ofCROPWAT 8.0and assessment of natural land adaptation process were applied in the study. Irrigation demand for coffee, pepper, cashew, rubber, tea, rice, maize and cassava were calculated in 2015with highest value of 7.746 m3.ha-1.crop-1forwinter-spring rice. Theirrigation water wasforecast for the future (2045) with decreasing trend in three scenarios (11.7% for low scenario, 18.59% for average scenario and 4.25% in the high scenario) compared to the presentperiod. Furthermore, three maps for agricultural land-use thatdefine suitable areasand spatial allocation of land use plans, were proposed with climatechange scenarios as a response solution.
The Impacts OfEconomic Recession On Enterprises In The North Of Vietnam

Nguyen Quoc Chinh, Nguyen Hai Nui

Received: 09-01-2013 / Accepted: 20-04-2013
Economic Recession (ER) is an essential phase of economic cycle. The 2008 - 2009 economic recession had a strong impacts on the economy in general and the business activities of enterprises in particular. The main objective of this study was to analyze the effect of ER on business activities and workers’ life of some representative enterprises in the North of Vietnam, and propose some key sulutions to minimize the negative impacts of ER and improve the adaptability of enterprises to recession conditions. The systematical and participatory approaches were used. Data collection and analysis used in this study were data synthesis, direct survey of representive companies in the North using questionaire, consultancy, and comparision methods. The study showed that enterprises have been clearly impacted by the ER in all production and business processes. The main impacts were high input prices, limited resources, difficulties in labor and loans, instability in production and consumption and decline in the enterprise performance. To minimize these negative impacts, enterprises should apply multiple solutions and at the same time with the government supports.
Examining the Climate Change Policy Coherence in Can Tho City

Nguyen Minh Quang

Received: 03-07-2020 / Accepted: 12-10-2020
The proliferation of climate change policies and actions in Vietnam in recent years highlights a need to reconsider policy coherence for better climate governance. This paper aimed to explore the climate policy coherence in Can Tho City, whereby, to understand the climate policy coherence and provide science-based evidence for policy reforms in neighboring provinces that share many of the same policy issues. Based on the intensive literature review, the paper firstly proposes criteria for examining climate policy coherence from policy and development perspectives. This analytical toolbox was used to examine climate policies and actions in Can Tho. Results from Quantitative Document Analysis reveals that coherence in climate actions and inter-sectorial coherence are limited. Policy content analysis and in-depth expert interviews provided insights about some issues impeding the policy coherence. These include overlapping policy objectives and actions (i.e., 94.1% and 52.9% respectively), imbalance between adaptation and mitigation policies, limited inter-sectorial information sharing and cooperation, and a lack of policy accountability.
Variation in Morphometric Characteristics of Glossogobius aureusDistributed from Can Tho to Ca Mau

Phan Hoang Gieo, Dinh Minh Quang, Truong Trong Ngon, Nguyen Huu Duc Ton

Received: 19-02-2021 / Accepted: 12-03-2021
This study aimed to provide information on the morphometric variations of Glossogobius aureus, a commercial fish species in the Mekong Delta. A total of 742 individuals (282 males and 360 females) were collected during the dry and wet seasons (January 2020 to December 2020) at four studied sites (Cai Rang, Can Tho; Long Phu, Soc Trang; Hoa Binh, Bac Lieu; and Dam Doi, Ca Mau). The results showed that total length and body weight of this species varied along with seasons and studied sites, but not genders. There were no significant differences in all morphological characteristics were not significant difference except the body length and weight variations of the immature and mature fish. The studied site and season variables influenced the total length and body weight of this species. The results of the present study have provided useful information for this species identification and understanding of the ecological adaptation of the fish in the study locations.
Assessment of Vulnerability to Climate Change at District Level in Northwest of Vietnam: Case Study in Son La Province

Nguyen Anh Tuan, Nguyen Thi Bich Yen

Received: 04-10-2021 / Accepted: 01-03-2022
This study aimed to assess climate change vulnerability at the district level in Son La province. Vulnerability was definedbased on IPCC's conceptual framework, in which vulnerability is a function of components of exposure, sensitivity and adaptability. A total of 32 indicators belonging to these three components were selected and given weights based on the method of hierarchical analysis. The values of these indicators werecollected based on secondary data. Research results showedthat 5 out of 12 districts of Son La province werevulnerable to climate change at a high to very high levels. In which, Phu Yen district wasthe most vulnerable due to its both very high exposure and susceptibility to climate change, while its adaptability wasonly moderate. Son La city and Moc Chau district werethe lowest vulnerable to climate change.Factors that influence vulnerability were also identifiedThese results have implications for policy makers in developing appropriate and effective climate change adaptation strategies for Son La province.
Multi-label Classification and its Application for Vietnamese SMS classification

Hoang Thi Ha, Dao Xuan Duong, Le Thi Nhung

Received: 24-02-2022 / Accepted: 20-12-2022
Today, most of the users of mobile devices are regularly bothered by a large number of scam messages, advertising messages in different fields such as entertainment, shopping, finance, and real estate. Among these, each SMS message can belong to one or more different message types at the same time. Therefore, using single-label classification methods to classify messages would be inappropriate. In this study, we have summarized multi-label classification techniques, collected a dataset of 2,000 Vietnamese SMS messages (SMSVN), and improved the accuracy of the methods for multi-label classification by using the preprocessing techniques to normalize and clean data. Moreover, we have also applied the well-known multiple classifiers to test classification on this dataset. The results show that, after applying the preprocessing techniques, most of the multi-label classification techniques had higher accuracy and lower classification error. The Classifier Chains technique using Naïve Bayes model was suitable for the Vietnamese SMS data classification issues.
Effect of Salt and Arbuscular Mycorrhizal Fungus (AMF) on Anatomical Structuresof Talinum paniculatum(Jacq.) Gaertn.

Nguyen Phuong Mai, Dinh Thai Hoang, Doan Thi Thanh Nhan, Ninh Thi Phip, Pham Thi Huyen Trang, Phung Thi Thu Ha, Nguyen Thi Thanh Hai

Received: 15-12-2021 / Accepted: 22-05-2023
This study aimed to evaluate the changes in the anatomical structure of Talinum paniculatum(Jacq.) Gaertn. under saline condition, and the role of the arbuscular mycorrhizal fungus (AMF) in reducing the harmful effects of salinity on T. paniculatum.Experiments were carried out in a greenhouse in a completely randomized design with 6 irrigation treatments (water (control); 4g AMF; 0.2% NaCl; 0.4% NaCl; 0.2% NaCl + 4g AMF;0.4% NaCl + 4g AMF). The result showed that salt stress has changed the anatomical structure of the stem, leaves, and roots of T. paniculatum. Irrigation with 0.2-0.4% NaCl solution reduced the size of all observation parameters, thereby reducing the absorption and transport of water and minerals in the plant. At a mild salinity level (0.2% NaCl irrigation), there were changes in anatomical structures such as decrease in density and size of stomata, increase in midrib thickness and stem diameter for plant adaptation. In addition, the anatomical changes with AMF addition help the plants exchange water favorably under normal condition and reduce the damage of salinity to the T. paniculatum.
Impacts Of Covid-19 Pandemic on Young Female Migrant Workers in the Coastal area of Thua Thien Hue Province

Tran Thi Anh Nguyet, Le Thi Hoa Sen, Hoang Dung Ha, Tsutsui Kazunobu, Bui Thi Thu, Do Thi Viet Huong

Received: 17-04-2023 / Accepted: 04-08-2023
The Covid-19 pandemic has seriously affected all aspects of people's life. Migrant workers returning to the locality during the outbreak, were most vulnerable to the impact of the Covid-19 pandemic. Young female migrant workers, particullarly, had a lot of vulnerability and risks when returning to their hometowns. Therefore, thisresearch focused on understanding the impacts of the Covid-19 pandemic on employment, income, quality of life and psychology of young female migrant workers through a survey of 110 households with young female migrant workers who had to return to their localities in 6 communes in the coastal area of Thua Thien Hue province. Research results showed a significant decrease in income, employment, quality of life and anxiety during the Covid-19 pandemic occurence. Young female migrant workers were difficult to access and receive the supports of the government, as well as how to choose adaptation solutions when the Covid-19 pandemic is under control. Research recommended policies regarding employment, vocational trainings, physical and mental health care to support young female migrant workers tobuild their adaptive capacity to socio-economic, environmental and pandemic shocks.
DEVELOPMENT OF RICE LINES (Oryza sativaL.) TOLERANT TO SUBMERGENCE VIA Sub1GENE INTRODUCTION INTO LANDRACES AND ELITE BREEDING LINES

Nguyen Thi Lang, Nguyen Thanh Hoa, Pham Thi Thu Ha, Nguyen Van Hieu, Nguyen Ngoc Huong, Bui Chi Buu, Russell Reinke, Tran Bao Toan, Abdelbagi M Ismail, Reiner Wassmann

Received: 08-10-2015 / Accepted: 11-03-2016
Development of rice genotypes tolerant to complete submergence in the Mekong Delta was carried out for three continuous years by CLUES Project fund. Eighty five high-yielding cultivars and eighty four progenies from backcrossing population (BC3F3) of OM1490/IR64 Sub1were used to study the yield components and submergence tolerance. Phenotyping was implemented at three stages: seedling, tillering and heading. Different segregation ratio and phenotypical variation indicated the complex genetic background. All genotypes have been evaluated under both submergence and non-submergence treatments. Correlation coefficient between the survival rate (%) and tiller number /10 hills was positively significant of 0.8880**. Marker-assisted backcrossing (MAB) was exploited on chromosomes 9 to address ten molecular markers (SSRs). Of them, only three polymorphic SSRs really linked to the target QTLs. Marker-assisted selection helped identify elite lines, which would be breeding materials via three molecular markers on the target region viz. RM3269, RM5304 and RM1367 on chromosome 9. Three selected offspring lines from BC3F3population of OM1490/IR64 Sub1as 26, 38 and 50 exhibited good adaptation to submergence.
Introgression of Xa7 for Bacterial Blight Resistance to Restorer Linefor Development of Two-line Hybrid

Duong Duc Huy, Nguyen Van Hoan

Received: 07-09-2016 / Accepted: 16-12-2016
Two-line hybrid rice variety LC212 is valuable variety with high yielding potential, short growing duration, widely adaptation to environment but susceptible to Bacterial Leaf Blight (BLB). Backcross breeding method was conducted for transferring Xa7gene to restorer R212 which is male of hybrid rice variety LC212. The plants which have phenotype similar of R212, high resistance to three typical BLB races, carrying homogenous Xa7gene of BC2 and BC3 generation were selected by Pedigree selection. The selected plants were inoculated, similar phenotype was selected and MAS technicque were used to identify Xa7gene. The 25 lines R212BB of BC2F4 and the 8 lines R212BB of BC3F3 were selected. They are using for father step breeding of R212 restorer resistance to BLB as announced improved rice lines LC212.
Analysis of Genetic Diversity of Citrus Genotypes Collected in Ha Giangby RAPD and ISSR Markers

Nguyen Thi Phuong Thao, Vu Van Hieu, Nong Thi Hue, Nguyen Thi Oanh, Ninh Thi Thao, Vu Quang Sang

Received: 24-03-2015 / Accepted: 15-09-2015
Oranges grown in Ha Giang areone of the most common citrus products in northern Viet Nam. However,vegetative propagation and selection for adaptation to various growing environments led to deviation from original genotype.Assessinggenetic diversity of indigenous citrus maycontribute to the collection, classification, evaluation and conservation as well as provide genetic information among citrus germplasm, which could be used for the breeding program. RAPD and ISSR analysis combined with the construction of phylogenetic tree revealed the genetic relationship among researched citruses. The results showed that 25 RAPD and 5 ISSR primers generated polymorphic patterns of PCR products (100%), however,the numbers of polymorphic bands detected on each genotype were significant in range. A total of 2157 DNA bands were foundwith an average of 1.80 DNA bands per genotype. RAPD markers (OPAW19andOPAE15)and ISSR markers (T1andT5)yielded highest polymorphism, with 4.48, 4.23 and 3.25, 3.45 bandsper genotype, respectively. The resultsalso indicated that the similarity coefficient of 39 samples ranged from 0.33 to 0.98 and 5 genetic groups were obtained.

1 - 25 of 26 items 1 2 > >>

Search

Advanced filters

Search Results