Author(s):

Mitadru Mukherjee, Barada Padhy, Ravindra Donde, Pradosh Mahadani, Sk Yasin Baksh, Lambodar Behera and Sushanta Kumar Dash

Abstract: The present study was carried out on 32 upland rice genotypes (including checks), which were analysed for grain yield (GY) and related traits under contrasting moisture regimes (irrigated and drought stress). Analysis of variance showed that all the characters studied were significantly different. Highest GCV and PCV values were recorded for GY and FLW under drought stress and non-stress conditions respectively. Five characters namely DTF, PH, FLW, FGPP and GY were recorded to have very high heritability as well as GAM under both stress and control conditions. GY, FGPP and ETN were observed to have high or very high GAM values under both conditions. Furthermore, these traits also recorded high to moderately-high heritability and thus, emerged as most promising traits for improvement through selection. Association study revealed that GY is positively and significantly correlated to PH, FGPP and SF% at both genotypic and phenotypic level. Path coefficient analysis revealed a very high positive effect of FGPP and ETN on GY under both control and stress conditions. Additionally, DTF showed negative and positive effects on GY under stress and non stress respectively. Sufficient diversity could be noticed as the genotypes were grouped in to 4 clusters. D² and PCA indicated blast tolerant upland genotype CRMAS2620-1 to be a unique one because of its positioning in a sporadic cluster and therefore, could be used as a potential parent for hybridization with highly drought tolerant upland varieties.

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