Vol. 12, Issue 11 (2023)

Author(s):
Ashwani Kumar Singh, Alok Kumar Singh, Tarkeshwar and Shiv Prasad Maurya

Abstract:
The present study investigated the metric features resulting from the combining ability and gene activity present in CMS lines of rice (Oryza sativa L.) and their hybrids. In Kharif 2020, the study was carried out at Pilikothi Farm of Tilak Dhari Degree College in Jaunpur (U.P.) using a randomized block design. The observations were conducted on five competitive plants of a specific genotype that were randomly selected from a plot for every replication of the twelve features. A total of twelve metric characters recorded for the study. The analysis of variance for combining ability revealed highly significant mean squares due to lines × tester interactions representing importance of specific combining ability and non-additive gene effects for most of the characters except seedling height, panicle length, spikelets fertility (%) and harvest index. None of the CMS lines used as females had significant positive gca effects for grain yield. Among the testers, six genotypes had significant positive gca effects for grain yield per plant to emerge as good general combiner. The top five performers were Sarjoo-52 followed by AT-401, NDRK 50063, NDRK 50060 and IR64. Parents with various combinations of general combiner parents, such as high × high (H × H), high × average (H × A), high × low (H × L), average × average (A × A), average × low (A × L), and low × low (L × L), were involved in the crosses that displayed a high order of significant and desirable sca effects for different characters.