Abstract
Sharma, S., Upadhyaya, H. D., Gowda, C. L. L., Kumar, S. and Singh, S. 2013. Genetic analysis for seed size in three crosses of chickpea (Cicer arietinum L.). Can. J. Plant Sci. 93: 387–395. Seed size (determined by 100-seed weight) is an important component of trade and yield in chickpea (Cicer arietinum L.). The present investigation was undertaken to study the possibility of maternal inheritance for seed size and to estimate relative importance of additive and non-additive gene effects on seed size in three chickpea crosses involving two desi (ICC 5002 and ICC 7672) and two kabuli (ICC 11255 and ICC 17109) genotypes. The study included parents, F1, F2, backcross generations, and their reciprocals. Differences in the reciprocal mean 100-seed weight of F1, F2, and backcross generations were not detected in any cross. No definite major gene segregation pattern was observed in the F2generation, and the continuous variation observed indicated quantitative inheritance. Generation mean analysis indicated the presence of additive gene effects controlling seed size in three crosses. Additive×additive type of non-allelic interactions were found significant in desi×kabuli crosses, ICC 5002×ICC 17109 and ICC 7672×ICC 11255. The selection and breeding procedure may be modified for maximum exploitation of the fixable additive×additive epistasis by delaying selection in later generations and by maintaining large populations prior to selection for maximum recombination of genes to occur.
Highlights
Studies considering seed size as a quantitative trait showing polygenic inheritance have been reported by previous researchers (Kumar and Singh 1995; Malhotra et al 1997) and the genetic analysis has mainly been confined to estimating gene effects (Singh et al 1992, 1993; Kumar and Singh 1995) and heritability (Kumar and Singh 1995)
Chickpea genotypes having known major genes for seed size, ICC 11255 (Sd1Sd1sd2sd2) and ICC 5002 were included with large seeded types of unknown genetic constitution to study the inheritance of seed size in terms of maternal effect and the relative importance of additive and non-additive gene effects in three crosses
The reciprocal differences for mean 100-seed weight of F1, F2, and backcross generations were nonsignificant for all the crosses (Table 1)
Summary
Genetic analysis for seed size in three crosses of chickpea (Cicer arietinum L.). International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, PO, 502324, AP, India. The genetic analysis using molecular markers detected two quantitative trait loci (QTL) for seed size in intraspecific kabuli )desi (Cho et al 2002; Cobos et al 2007; Hossain et al 2010), desi )desi (Radhika et al 2007) and interspecific Cicer arietinum )C. reticulatum (Cobos et al 2007, 2009) recombinant inbred line populations in chickpea explaining up to 52% of the total phenotypic variation In most of these previous studies (e.g., Kumar and Singh 1995; Upadhyaya et al 2006; Upadhyaya et al 2011), parents utilized had a limited range of available variation for seed size. Chickpea genotypes having known major genes for seed size, ICC 11255 (Sd1Sd1sd2sd2) and ICC 5002 (sd1sd1Sd2Sd2) were included with large seeded types of unknown genetic constitution to study the inheritance of seed size in terms of maternal effect and the relative importance of additive and non-additive gene effects in three crosses
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