Evaluation of whole-plant architecture of aerobic rice (Oryza sativa) for yield attributes
Publication Date : 29/07/2018
Rice (Oryza sativa L.) is the staple food of Asia and this warrants a high production across the region. Breeding for drought tolerance has immense value to the farmers as their livelihood depends on the harvest. The present investigation was conducted to study the whole-plant architecture of aerobic rice by analyzing root and shoot characters for improving the grain yield. In this study, ten genotypes which were highly contrasting in phenotypic characters were grown in field as well as in PVC pipes. Analysis of variance for root morphological traits, yield and yield attributed traits under aerobic condition revealed significant differences among the genotypes for all traits. GCV, PCV, h2 and genetic advance were high in genotypes for all the traits recorded. For root traits, GCV ranged from 14.42 % for root growth rate by length (RGRL) to 44.76 % for root-shoot weight ratio (RSWR) while vegetative traits recorded relatively lower GCV which ranged from 6.68 % for days to maturity (DTM) to 34.09 % for shoot biomass (SBM). Grain yield showed significant positive correlation with plant height (0.458), panicle length (0.549), shoot biomass (0.771), shoot growth rate by length (0.408) and total plant length (0.446). Path analysis revealed that root length (RL) had the highest positive direct effect on grain yield per plant whereas plant growth rate by wt. (TGRW) had the lowest positive direct effect. The root-shoot ratios were higher for improved accessions as compared to traditional genotypes.
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