Genetic variation in root morphology and microsatellite marker loci in upland rice (Oryza sativa L.)
Thanh, Nguyen D., Texas Tech Univ., Lubbock (USA). Dept. of Plant and Soil Science. Plant Molecular Genetics Laboratory
Upland rice occupied about 15 percent of the world's rice plantation. The yield of upland rice is very low, average about t/ha. Drought is a common constraint of productivity in upland rice. In Vietnam, upland rice is the major food crop for ethnic groups in upland rice is poorly investigated so far. Most current varieties are traditional, unimproved type with low yields ranging from 0.5 to 1 t/ha. The long term goal of this research is to use molecular marker technology for selection and development of drought resistant upland rice as one of the strategies for increasing upland rice productivity. In this poster we present redults on genetic variability of several root traits which are most related to drought avoidance mechanism in upland rice and the use of microsatellite markers to study genetic diversity in Vietnamese upland rice germplasm. Thirty three traditional upland rice accessions representing different ecotypes from the Northern provinces of Vietnam and thirteen upland rices from other countries were used in the experiment. Maximum root length (MRL), root thickness (RT), deep root dry weight to shoot (DR/SR) and total root to shoot (TR/SR) ratios are considered as more important for drought avoidance in upland rice. Analysis of variance indicated significant genetic variation of these traits among investigated varieties. Correlation analysis showed MRL is significantly correlated with RT (r=0.57, P0.01), deep root weight (DRDW, r
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