DEVELOPMENT OF DOUBLE-CROSS HYBRIDS AS NEW SOURCES OF FAVOURABLE ALLELES IN FUTURE OKRA BREEDING
DOI:
https://doi.org/10.48165/abr.2025.27.01.49Keywords:
Breeding strategy, heterosis, MAGIC population, single cross, hybridAbstract
The present study in okra (Abelmoschus esculentus L.) assessed the magnitude of heterosis over mid- and better-parents and elucidated the nature of gene action governing yield, quality traits, and resistance to bhindi yellow vein mosaic virus (BYVMV). Six single-cross (SC) commercial hybrids were crossed in a 2 × 4 line × tester mating design to generate double-cross (DC) hybrids. Among the SC hybrids, ‘Radhika’ and ‘SVOK-1408’ emerged as promising candidates for BYVMV resistance and are recommended for cultivation in disease hot-spot regions. Most of the evaluated traits exhibited predominance of non-additive gene action, suggesting that heterosis breeding would be an effective strategy for trait improvement. Based on general combining ability effects and mean performance, two SC hybrids, ‘Radhika’ and ‘Anushri’, were identified as superior genitors for future breeding programmes. In DC hybrids, percent disease index of BYVMV showed the highest desirable heterotic response, followed by pod yield per plant, total dietary fibre content of pod, pod length, pod weight, number of pods per plant, and pod diameter. The DC hybrids ‘Radhika × Bindu’ and ‘SVOK-1408 × Anushri’ demonstrated high commercial potential and could be exploited after multilocational evaluation across tropical and subtropical environments. High-yielding, BYVMV-resistant DC hybrids may also be utilized in segregating generations, and suitable breeding strategies have been proposed for developing multiparent advanced generation intercross (MAGIC) populations.
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