Combining ability and gene action for yield improvement in kenaf (Hibiscus cannabinus L.) under tropical conditions through diallel mating design

Abstract

Nine morphologically distinct kenaf genotypes were hybridized to produce 36 hybrids following a half diallel mating design. The combining ability and gene action of 15 yield and yield components were assessed in hybrids and their parents across two environments. Except for the mid diameter and plant height traits, there were highly significant differences (p ≤ 0.01) between the environments and the interaction of genotype and environment. Additive gene effects were considerable for the inheritance of these traits, and the expression of these additive genes was heavily influenced by the environment. Significant differences were found for all studied traits for GCA except top diameter and SCA except plant height and top diameter, implying the presence of both additive and non-additive gene action for the inheritance of the concerned characters. For all features except top diameter and number of nodes, the magnitude of GCA variation was significantly higher than that of SCA variance, indicating the additive gene's predominance. The parental lines P1, P3 and P4 were outstanding general combiners for fiber yield and yield-related parameters. Considering combining ability and genetic analysis study, the crosses P1 × P4, P1 × P9, P2 × P3, P2 × P5, P4 × P6, P4 × P7, P4 × P9, P5 × P8, and P7 × P9 were found promising for their heterotic response to higher fiber yield, stick yield, seed yield and could be for future improvement in kenaf breeding programmes.

Combining Ability, Heritability, and Heterosis for Seed Weight and Oil Content Traits of Castor Bean (Ricinus communis L.)

“…On the other hand, the GCA/SCA for 100-seed weight was less than 1 (0.56), indicating that non-additive gene effects predominantly control this trait. Similar results were reported by others [32,35], where substantial differences between GCA and SCA allow the improvement of specific traits by selecting parents that pass on the desired traits to their offspring with additive genetic effects. Genetic analysis of fatty acid content in seed oil and studies on yield-forming traits have demonstrated significant differences between GCA and SCA in the F 1 generation, indicating the dominance of additive variability over non-additive variability [36].…”

Growth, Yield, and Fiber Morphology of Kenaf (Hibiscus Cannabinus L.) Varieties Influenced by Different Levels of Npk Fertilizers

“…However, results from this present study were confirmed by Ullah et al (2017), whose reported that the application of NPK resulted in greater growth and yield than the application of N, P, K, NP, NK, or PK. The results of growth parameters were also supported by other researchers, who reported that highly significant differences (p ≤ 0.01) between the environments and the interaction of genotype and environment were observed in kenaf genotypes on mid diameter and plant height traits (Al-Mamun et al, 2022).…”

Cultivation Strategies of Kenaf (Hibiscus cannabinus L.) as a Future Approach in Malaysian Agriculture Industry

“…Adequate irrigation has the potential to increase the kenaf yield volume twofold [49]. Kenaf grows in places with a relative humidity ratio of 68 to 82% and temperatures varying from 22.6 to 30.3 • C [31]. According to Zhang et al [42], one of the most important factors influencing fibre production and quality in kenaf is the flowering stage, which is influenced by photoperiodism.…”