Vol. 12, Issue 3 (2023)

Author(s):
Dinkar, Anand Kumar, Ravi Ranjan Kumar, Mankesh Kumar, SP Singh, Satyendra and Namrata Dwivedi

Abstract:
The presence of sufficient genetic variability, the knowledge of nature of association among different characters and relative contribution of different characters to yield is a prerequisite to any breeding programme. The aim of the present study was to estimate genetic parameters of thirty two yield, yield attributing and quality traits in 36 aromatic rice genotypes with a view to select better yield attributes in aromatic rice. The higher value of phenotypic co-efficient of variation (PCV) compared to the corresponding genotypic coefficient of variation (GCV) for all the studied traits indicated that there was an influence of the environment. High estimates of PCV and GCV were noticed for number of tillers per hill, leaf width of blade, stem length excluding panicle, panicle number per plant, total number of spikelet’s per panicle, number of fertile grain per panicle, thousand seed weight, biological yield, grain yield per plant, harvest index, ratio of grain length/width and ratio of kernel length/width. High heritability coupled with high genetic advance was observed in number of tillers per hill, plant height, leaf length of blade, leaf width of blade, stem length excluding panicle, panicle number per plant, total number of spikelet per panicle, number of fertile grain per panicle, thousand seed weight, biological yield, grain yield per plant, harvest index, grain length, grain width, kernel length, ratio of grain length/width, ratio of kernel length/width, cooked rice length, cooked rice width, cooked rice length/width ratio, length expansion ratio, volume expansion ratio and iron content. which reflected that the direct selection of these characters based on phenotypic expression by simple selection method for yield improvement would be more reliable. Grain yield per plant showed significant and positive association with numbers of tillers per hill, leaf length of blade, leaf width of blade, panicle length of main axis, panicle number per plant, total number of spikelet’s per panicle, number of fertile grain per panicle, 1000 seed weight, biological yield, harvest index % and cooked rice width indicating selection of these characters for yield improvement in aromatic may be rewarding. Path coefficient analysis revealed that biological yield, harvest index, grain length and width expansion ratio and cooked rice length/width ratio had a high direct positive effect on grain yield have moderate direct effect on yield had direct positive effect on yield per plant indicating their importance during selection in yield improvement programme. Moreover, the information generated from this study, can be exploited in future breeding programme of aromatic rice.