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• The Responses of Maize Inbred Lines to Flooding Condition at Seedling Stage

  Nguyen Van Loc, Nguyen Viet Long, Nguyen The Hung, Nguyen Van Cuong, Pham Quang Tuan

  Received: 02-10-2013 / Accepted: 20-11-2013

   Abstract PDF (VIETNAMESE)

  The effects of flooding on growth and biomass accumulation of maize at the seedling stage was studiedin pot experiment in greenhouse conditions. Seedlings of eleven maize inbred lines were subjected to flood and control treatment for a period of one week. Growth in terms of root system, leaf area, leaf number, leaf chlorophyll content (SPAD), plant height, and dry matter of the plant were significantly reduced in flood stressed conditions. There was clear genetic variation inresponse to flooding stress among themaize inbred lines. Three inbred lines: CLT-T10, CLT- T83 and TB23 showed better tolerance to flooding condions. These inbred lines were recommended to use in further study at molecular level of response to flooding or to use in gerplasm improvement for flooding tolerance. The current study pointed out that there is a relationship between root development and flooding tolerance in maize. Root traits might be important to consider in maize improvement for flooding tolerance.

• Development of Submergence Tolerant Rice Lines for the Northern Region of Vietnam

  Pham Van Tinh, Hoang Ba Tien, Tran Van Quang

  Received: 14-03-2019 / Accepted: 07-05-2019

   Abstract PDF (VIETNAMESE)

  This study was carried out to evaluate agronomical characteristics, yield and submergence tolerance of inbredrice lines thathave been selected fromcross combinations betwwen purerice line and cultivars with lines carrying submergence tolerance gene Sub1. The field experiments were conducted at Gia Loc district, Hai Duong province. Out of 24 inbred lines, 6 promising ones selected possessed good characteristics,such as short growth duration, medium plantheight, short flagleaves, slight pestinfestation, high yield as well as with the high milled rice tohead riceratio, and low to moderate amylose content. Basedon PCR amplificationusing twoSSR primers SC3 and ART5, the resultsshowed that all lines carried the submergence gene Sub1. The most promising line,U1080,selected from the cross between TL6/and Swarna-Sub1 haddesirable growth duration, slight pest infestation, high yield and good eating quality. Thus,for the improvement of submergence tolerance, therice cultivars should be crossedwith the materialscarrying submergence tolerancegeneandindividuals selectionbe practicedin the segregatingpopulationfor furtherevaluation ofagronomical characteristics in both normal and flooding conditions.

• Heterosis ofAgronomical and Physiological Characteristics Related to Flooding Tolerance in Maize (ZeamaysL.)

  Nguyen Van Loc, Nguyen Viet Long

  Received: 10-11-2014 / Accepted: 22-07-2015

   Abstract PDF (VIETNAMESE)

  This study was conducted to investigatethe heterosis of agronomical traits relating to flooding tolerance in 10 maize hybrids derived from 7 parental inbred lines. The flooding treatments were applied artificially at seedling stage (3 - 4 leaves) in field conditions for one week. There was positive relationship of root length, SPAD value, dry matter accumulation and flooding tolerance ability in maize plant. Positive heterosis was found for SPAD, dry matter accumulation and grain yield under flooding stress conditions. Better growth and higher SPAD value under flooding conditions of D1xD3, D1xD4 and D2xD5 might contribute to the higher yields of these hybrids compared with others.