Evaluation of pre-harvest germination resistance and initial analysis of genetic diversity of some popular rice varieties grown in Binh Dinh province based on morphological characteristics
Abstract
Research on the morphological characteristics, agronomics, pre-harvest germination resistance, and genetic diversity of some popular rice varieties grown in Binh Dinh province is essential in assessing material resources for selecting and developing new rice varieties that can adapt to climate change. The results show that there is one extra short-day variety, five short-day varieties, and three medium-day varieties . Among these three varieties , there is an average pre-harvest germination percentage of over 50%, and three under 15%. The plant height ranged from 94.98 to 110.80 cm, effective tiller number per plant from 5.48 to 8.07, flag leaf length from 25.93 to 32.05 cm, and flag leaf width from 1.17 to 1.51 cm. The panicle length ranged from 26.53 to 31.98 cm, grain length from 5.91 to 8.41 mm, grain width from 2.31 to 3.60 mm, L/W ratio from 2.15 to 3.32, 1000-grain weight from 19.85-24.23 g, number of panicle/m 2 from 279.83 to 351.66, and filled spikelet per panicle from 108.50 to 154.33. The theoretical and actual yield of the varieties ranged from 76.76-109.02 and 54.74-77.55 quintals/ha, respectively. Based on 13 phenotypic traits, the rice varieties studied were classified into 4 groups of genetic diversity with a coefficient of 0.03. The information obtained from this study is critical for breeding rice varieties that can adapt to climate change in Binh Dinh province in particular and South Central Region in general.