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Please use this identifier to cite or link to this item: http://www.erepo.iihr.ernet.in/handle/123456789/213

Title: Studies on genetics of seed production in F1 hybrid and parents of onion (Allium cepa L.).
Authors: R, Veere Gowda
C S, Pathak
Keywords: Onion
Seed production
Issue Date: 2010
Citation: Veere Gowda R and C.S. Pathak. 2010. Studies on genetics of seed production in F1 hybrid and parents of onion (Allium cepa Lin.). National Conference on Production of quality seeds and planting material-Health Management in Horticultural crops, New Delhi p 45.
Abstract: At IIHR, Bangalore effort was made to develop superior genotypes of high seed yielding parents for development of F1 hybrids in onion. Studies on genetics of seed yield and traits related to seed yield were investigated. Combining ability studies helps in identifying superior genotypes of parents for high seed yielding ability .This method has the advantage of testing the inbred lines for both specific and general combining ability besides the type of gene action governing the seed producing characters at F1 stage itself. The partial diallel system is used for combining ability analysis. Eleven parents namely IHR 52-80, 60-94,378,400,121-26, 68, 399, 6, 397, 19-91 and 56-198 were crossed in all possible combination. Eleven parental lines and their 55 F1 hybrids of onion were evaluated for traits like plant height, earliness for flowering, flower stalk /plant, diameter of umbel stalk and umbel, seed yield /umbel/plant//hectare and 1000 seed weight. The results showed that the variance due to parents and hybrids were highly significant and combining ability analysis revealed that the variances due to SCA were greater than GCA for seed yield and related traits. Graphical analysis (Wr, Vr), genetic components, proportion of genetic components (H1/D)1/2 indicated that the predominance of dominance and over dominance and very little effect of additive gene action for seed yield and related traits. The gca effects indicated that the parent IHR 68, IHR 60-94 and IHR 6 were good general combiner and sca effects showed that the crosses IHR121-26 X IHR 397, IHR 52-80 X IHR56-198 and IHR121-26 XIHR 56-198 were good specific combiner for seed yield and related traits. Duplicate gene interaction, moderate heritability and control of more than one group of dominant genes were observed for seed yield and related traits. On the whole seed yield and its attributing traits in onion were governed by dominance and over dominance and little of other types of gene interaction. Hence heterosis breeding and recurrent selection may be useful for improvement of seed yield and its related traits in onion. The per se performance of parent, F1 and combining ability effects determine the choice of parents for hybridization. The parents IHR 68, IHR 60-94 and IHR 6 were identified as superior genotypes with high seed yielding ability which were utilized in the breeding programme.
URI: http://hdl.handle.net/123456789/213
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