Hayman’s graphical analysis of yield, quality and their components traits in rice (Oryza sativa L.) under coastal agro ecosystem

Abstract

Six × six full diallel mating involving six parents viz., (P1) ADT 37, (P2) ADT 43, (P3) ADT 45, (P4) ASD 16, (P5) CO51 and (P6) CO47 was effected to evolve 30 hybrids in rice crop. The six parents along with their 30 F 1 hybrids were evaluated for ten agronomic traits viz days to 50 per cent flowering, plant height at maturity, the number of productive tillers per plant, panicle length, the number of filled seeds per panicle, seed length, seed breadth, seed L/B ratio, hundred seed weight and seed yield per plant. The traits viz., seed length and seed L/B ratio were controlled by complete dominance. Incomplete dominance was found to operating in the expression of the traits viz., the number of filled seeds per panicle and seed yield per plant. Partial dominance can be had as semi additivity. On the other hand, the traits viz., days to 50 per cent flowering, plant height at maturity, panicle length, seed breadth and hundred seed weight were controlled by over dominance. Apart from this amphi directional dominance was well evidenced from the correlation coefficient of Yr and Wr -Vr as well as Vr -Wr graph. It is earnestly advised to inter-cross among the parents to evolve high heterotic lines and/or improved populations.

Assessment of genetic components and heterotic potential for panicle and yield related traits in rice (Oryza sativa L.)

“…Hayman's diallel analysis provides all the valuable genetic information viz., additive and dominance variances, over dominance effect, the proportion of dominant and recessive alleles in parents, group of genes governing a trait, heritability and presents graphical visualization using variance-covariance (Vr-Wr) graph. Hayman's diallel analysis was previously applied for yield related traits (Satheeshkumar et al, 2021), flag leaf characters (Bassuony and Zsembeli, 2021), biotic stress tolerance (Gunasekaran et al, 2020), rice quality parameters (Bano and Singh, 2019;Hasanalideh et al, 2019) and salinity tolerance (Souleymane et al, 2017) in rice. Grain number per panicle and other panicle and yield related traits need more valuation using Hayman's diallel approach for understanding about the influence of various genetic parameters which will in turn increase the grain yield.…”