Breeding Sweet Pepper for Improvement in Yield Components and Fruit Quality Traits under Low Cost Protected Structure

Exploitation of heterosis is one of the potential means for improvement of sweet pepper (Capsicum annuum var. grossum L.) that can further be utilized for identification of desirable recombinants. Promising hybrids could be acceptable to growers of tropical and subtropical climates if it is a high yielder with attractive fruit colour and blocky shape. Seven diverse parents were selected through multivariate analysis and were crossed in half diallel mating design to determine the extent of heterosis, mode of gene action, combining ability effects, and dominance estimates for ۱۸ quantitative characters. Expression of fruit colour and shape at physiological maturity stage in the F۱ generation indicated the dominance of red coloured group over other fruit colour groups and dominance of blocky fruit shape over elongate and round fruit shape. Preponderance of non-additive gene action for most of the characters under study suggested the usefulness of exploitation of hybrid vigour. Three genotypes, ۸/۴, C/۴, and Baby Bell were found most promising donors. The hybrids, Arya×Baby Bell, ۸/۴×Baby Bell and C/۴×۸/۴ were identified as promising based on per se performance, heterosis manifested, and relevance of specific combining ability effects, for possible commercialization under low cost protected structure of tropical and subtropical climates after critical testing. Partial to over dominance response in inheritance of most traits contributed to the genetic basis of heterosis. Isolation of pure lines from the segregating generation of heterotic hybrids emerged as a promising approach to develop line-bred variety having improved fruit yield and quality.

Keywords:

Capsicum annuum var. grossum L. , Combining ability , Dominance effect , Heterosis.