Authors: 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.
Keywords: Descriptors for Rice, Germplasm, Quantitative trait, Qualitative trait, Rice, Yield
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ARDC-Bajo. (2015). Rice (Annual Report 2013-2014) Bajo, Wangdue: ARDC-Bajo, Department of Agriculture, Bhutan.
ARDC-Bajo. (2016). Rice (Annual Report 2014-2015). Bajo, Wangdue: ARDC-Bajo, Department of Agriculture, Bhutan.
Aslam Sagar, M., Akram, M., & Ashraf, M. (1995). Agronomic and quality traits of some elite rice genotypes. Pakistan Journal of Scientific and Industrial Research, 38, 348-350.
Brennan, J. P., & Malabayabas, A. (2011). International Rice Research Institute’s contribution to rice varietal yield improvement in South-East Asia: Australian Centre for International Agricultural Research Canberra.
Chin, H.-s., Wu, Y.-p., Hour, A.-l., Hong, C.-y., & Lin, Y.-r. (2016). Genetic and evolutionary analysis of purple leaf sheath in Rice. Rice, 9(1), 8.
Ghimiray, M. (2012). An analysis of rice varietal improvement and adaptation rate by farmers in Bhutan. Journal of Renewable Natural Resources Bhutan, 8(1), 13-24.
Ghimiray, M., & Vernooy, R. (2017). The importance and challenges of crop germplasm interdependence: the case of Bhutan. Food Security, 9(2), 301-310.
Hussain, S., Fujii, T., McGoey, S., Yamada, M., Ramzan, M., & Akmal, M. (2014). Evaluation of different rice varieties for growth and yield characteristics. J Anim Plant Sci, 24(5), 1504-1510.
IRRI. (1980). Descriptors for rice, Oryza sativa L. Los Baños, Philippines International Rice Research Institute (IRRI).
IRRI. (1996). Standard evaluation system for rice (4th ed.). Los Baños, Philippines International Rice Research Institute (IRRI).
Khush, G. S. (2005). What it will take to feed 5.0 billion rice consumers in 2030. Plant molecular biology, 59(1), 1-6.
McKenzie, K. S., Rutger, J. N., & Peterson, M. L. (1980). Relation of Seedling Vigor to Semidwarfism, Early Maturity, and Pubescence in Closely Related Rice Lines 1. Crop Science, 20(2), 169-172.
NBC. (2008). Plant Genetic Resources of Bhutan Vol 1: Field Crops. Thimphu: National Biodiversity Centre (NBC), Ministry of Agriculture & Forests.
NSB. (2016). Statistical Yearbook of Bhutan 2016 Thimphu: National Statistics Bureau (NSB). Takeda, K. (1986). Gene symbols for grain size and shape. RGN, 3, 14-15.
Tanaka, T. (1976). Regulation of plant type carbon assimilation of rice. JARQ Japan Agriculture Research Quarterly, 133-138.
Thakur, R. (1981). Deep water rice yield in Bihar, India Proceeding of the 149-167. . Paper presented at the International deep water rice workshop., Bangkhen, Thailand.
Venkateswarlu, B., Vergara, B. S., Parao, F. T., & Visperas, R. M. (1986). Enhancing grain yield potentials in rice by increasing the number of high density grains. Philipp J Crop Sci, 11(3), 145-152.
Yoshida, S. (1996). Fundamentals of Rice Crop Science. . Los Baños, Philippines International Rice Research Institute (IRRI).