DEVELOPMENT OF A DIVERSIFIED SET OF Triticum timopheevi BASED FERTILITY RESTORERS IN WHEAT
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
The study was based on 2100 backcross progenies derived from crosses of fertility restorers with 9 European winter wheat lines. BC1F6 progenies were evaluated at PAU, Ludhiana in 2017-18 for key traits of fertility restoration and anther extrusion, along with preliminary agronomic performance. On the scale of 1-9 for anther extrusion, about 75% progenies exhibited score of 7 and above as high anther extrusion winter wheat lines were used as parents. The range for fertility restoration varied from 12% - 80% in the backcross derivatives. Mean yield of the diversified restorer set was found to be higher than the R-parents. In the restorer evaluation trial, two top yielding lines were line no. 6 (R-1//AMORAK/R-19) and 78 (RS-534//HURLEY/R-4). A total of 26 restorer lines surpassed the highest yielding R-parent. The back cross derivatives involving Amorak as winter parent proved to be superior, followed by Exotic and Maxyl based restorers. R-1//AMORAK/R-19 came out to be best performing in terms of mean yield as well as fertility restoration, whereas R-1//AMORAK/R-1 and RW-17//EXOTIC/R-1, both proved to be best performing for pollen viability and anther size characters. RS-317//HURLEY/R-4 and RS-534//MAXYL/R-28 displayed superiority in terms of tiller number and thousand grain weight, respectively. In the preliminary evaluation of test hybrids, 11.1% F1s showed significant heterosis over commercial checks. The best hybrid from the restorer set was TH 32 (CMS BWL 3275 X R-4//HURLEY/R-1), exhibiting standard heterosis of 29.5%, 21.5%, 25.4% and 28.5%, over checks HD 2967, HD 3086, PBW 725 and PBW 723 respectively. In F2 populations derived from fully fertile F1s, significant association was observed between fertility restoring Rf8 gene with fertility restoration trait.
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