National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Improvement in sunflower emphasizes the urgency of generating heterotic hybrids that is achieved by tapping the excellent combining ability and heterotic vigour available in the genetically divergent material. Concomitant with major diseases prevailing largely and most of the sunflower experimental hybrids and cultivars being based on single cytoplasm, large scale cultivation of the crop finds itself in greater threat as evident by susceptibility tonew emerging diseases and declining yield levels over the decades. However, efforts are being made to diversify both cytoplasm and the restorers, but with very limited success. To augment resistance breeding and improve yield levels, fertility restoration in three different CMS lines of sunflower was studied using sixteen recombinant inbred lines derived from an exotic line TX 16Rthrough introgression breeding as well as chemical mutagenesis. The new inbreds behaved as either maintainer/restorer on different CMS lines. Among the sixteen new inbreds tested, eight inbreds (DSR-121, DSR-122, DSR-124, DSR-128, DSR-131, DSR-132, DSR-134 and DSR-136) behaved as restorers, while the inbred DSR-125 behaved as a maintainer on CMS 103A. However, none of the restorer lines completely restored fertility on the female lines CMS-302A and CMS-PET27A. The study identified several effective restorers derived from an exotic line TX16R, which can be utilized in production of highly heterotic and resistant sunflower hybrids.
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