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• Effect of Nitrogen on Growth and Yield of Quinoa Accessions

  Dinh Thai Hoang, Nguyen Tat Canh, Nguyen Viet Long

  Received: 29-10-2014 / Accepted: 09-03-2015

   Abstract PDF (VIETNAMESE)

  This study evaluated growth and yield of two quinoa genotypes in winter-spring and spring-summer growing seasons under different levels of nitrogen fertilizer applied to determine growing season and dressing dose for quinoa production in the Red River Delta, Vietnam. The field experiment was a split-plot design with three replications. The main factor consisted of four nitrogen levels: N1- 0kg N; N2- 30kg N; N3- 60kg N và N4- 90kg N/ha ( winter - spring season) and N1- 30kg N; N2- 60kg N; N3- 90kg N và N4- 120kg N/ha (spring - summer season). The sub-factor consisted of two quinoa genotypes of Chilean origin, Green and Red quinoa. Data were collected for growth duration, plant height, stem diameter, dry matter accumulation, chlorophyll index (SPAD meter), lodging tolerance, pests and diseases, number of panicles/plant, number of grains/panicle, 1000 grain weight and grain yield. Increased nitrogen levels prolonged crop duration in spring - summer season only but increased dry matter accumulation, number of grains/panicle, 1000 grain weight and grain yield of both quinoa varieties in both growing seasons. Application of 90kg N/ha appeared as optimal dose for growth, development and yield of quinoa varieties in both growing seasons. The results showed that winter - spring season was favorable for growth and grain yield in the Red River Delta.

• Detection and Identification of Virus Causing Mosaic onLettuce in SomeProvinces of the Red River Delta

  Nguyen Duc Huy, Nguyen Thi Thanh Hong, Bui Phuong Anh

  Received: 03-04-2018 / Accepted: 14-06-2018

   Abstract PDF (VIETNAMESE)

  The aim of this studywasto identify potyviruses from lettuce leaf samplesshowing virus-like symptom collected from sixprovinces in theRed River Delta. The leafsamples were inoculated onto indicator plants such as Chenopodium quinoa, C. amaranticolorand Nicotiana benthamianafor examining the presence of the viruses. Furthermore, total RNAs wereextracted from the leafsamples and amplified by RT-PCR using universal primer pairs, CI-For and CI-Rev, for the detection of potyvirus. After inoculation,indicator plants showed yellow spot and systemic infection on C. quinoa, C. amaranticolorand mosaic on N. benthamiana,indicatingthat lettuce the leaves were infected withvirus. RT-PCR amplificationof about 0.7 kb revealedthat the leaf samples were infected by genus potyvirus. Sequencingof RT-PCR products showed 99.0% nucleotide identiy of C terminus of the cylindrical inclusion (CI)withLettuce mosaic virus(LMV). LMV infectsGomphrena globose, Datura metel, Pisum sativumand Solanum lycopersicum in the pathogenicity test.This is the first report onLMV in Vietnam.

• EFFECTS OF SALINITY STRESS ON GROWTH AND YIELD OF QUINOA (Chenopodiumquinoa Willd.) AT FLOWER INITIATION STAGES

  Nguyen Viet Long

  Received: 08-01-2016 / Accepted: 12-04-2016

   Abstract PDF (VIETNAMESE)

  The objective of this study was to evaluate the growth and yield characteristics of quinoa genotypes grown under salinity stresses at different stages of development. The experiment was conducted in Vietnam National University of Agriculture. Two quinoa genotypes and four NaCl salt concentrations (0, 50, 150 and 300 mM) were laid out in factorial experiment in RCBD with three replications. Salinity stress was induced by irrigation with nutrient solution containing NaCl with corresponding concentrations to quinoa plants grown in sands for two weeks during flowering initiation (35 days after sowing). The results showed that salinity reduced plant height, number of leaves on main stem, number of branches on plant, root length, root dry weight, shoot dry weight, SPAD Chlorophyll Meter Reading (SCMR), panicle length, seed amount, the number of branches per panicle and 1000-seed weight. Quinoa genotypes with high potential for the number of leaves on main stem, the number of branches on plant, root length, root dry weight, SCMR and shoot dry weight under non-stress conditions performed well under salinity conditions.