Diallel and stability analysis of kenaf (Hibiscus cannabinus L.) in South Africa

[摘要] English: Kenaf (Hibiscus cannabinus L.) is an important fiber crop world wide, and has a great potential for its multipurpose uses. It could play a significant role in future fiber supply in Southern Africa. Six diverse cultivars were selected from 14 genotypes as parental lines and crossed in a full-diallel method. The parental lines and 30 F1 hybrids were assessed and various traits were measured. General combining ability (GCA) was lower than specific combining ability (SCA). This indicated that non-additive genetic effects were more important for the inheritance of those characteristics. High heritability in the broad sense was recorded for the yield related characteristics (FPM, DPM, PH, BD, MD). Heterosis was widely expressed in the F1 generation. Many crosses showed both mid-parent and high-parent heterosis for the yield characteristics (FPM, DPM, PH, BD, MD). It can be concluded that a hybrid breeding program could effectively improve kenaf yield. Nine kenaf cultivars were evaluated for stability in two locations across two years. Highly significant differences were observed between the locations and years for fresh yield, defoliated yield and dry yield. The location under irrigated conditions had a higher yield value than under dry land conditions. Genotype x environment interaction was significant in this study. Four different types of stability parameters and correlation analyses were used to evaluate kenaf cultivar stability. In the combined analysis, El Salvador and Everglades 41 were the cultivars that tended to have highest dry yield in the various environments. Tainung 2 was the most unstable cultivar for the measured characteristics.

[发布机构] University of the Free State