AUTHOR: Yeshey Dema, Sonam Tashi, Mahesh Ghimiray, Ngawang Chhogyel
Extensive use of high yielding varieties has greatly reduced the genetic diversity in breeding germplasm of major food crops in the world. It is necessary to evaluate new rice germplasm to select superior lines of early maturing, high yielding, and resistance to biotic and abiotic stress breeding materials as strategy for rice improvement. This study was carried out to evaluate the morpho-agronomic characters of new rice germplasm and to compare the grain yield between 18 different rice germplasm, including the standard check BajoKaap 2. The experiment was conducted at the Agriculture Research and Development Centre, Bajo, Wangduephordang from April to October 2016. It followed a Randomized Complete Block Design with 18 treatments and three replications per treatment. The germplasm were evaluated based on 12 qualitative and 12 quantitative traits following the Descriptor for Rice Oryza sativa L and the standard evaluation systems during the different growth stages of the rice plant. Differences between the germplasm were observed in characters such as awning and flag leaf angle. Out of 18 treatments, eight had erect flag leaf angle while the rest exhibited intermediate type and only four had awns. Significant differences were observed between the treatments (P<0.05) in terms of plant height, leaf length, leaf width, number of tillers per hill, 50% flowering, panicle length, grain length, grain width and 1,000 grain weight. However, there was no significant difference in yield. Sinice these new rice germplasm are in the initial evaluation phase, further assessment may be required to ascertain their overall performance.
Descriptors for Rice, Germplasm, Quantitative trait, Qualitative trait, Rice, Yield
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