Selection of compatible restorer lines, maintainer lines and their application in hybrid wheat [Triticum aestivum (L.) em. Thell].

摘要

To identify maintainers and restorers, test crosses were made and evaluated, of which a very high frequency (87.17%) was male sterile and therefore classified as complete maintainers. Only two pollenizers, namely, 4099R and 4101R were able to restore complete fertility in the test crosses. PWR 4099R restored complete fertility in T. araraticum. The seed set on the covered main spike in the test cross progenies ranged from 0-77. Among all the crosses attempted, only two exotic genotypes, PWR 4099R and PWR 4101R used as pollen parents produced seeds in covered spike which indicated that the exotics possessed fertility restorer gene(s). The highest spike fertility was observed in two F1 hybrids in which the number of seed set ranged from 46 to 77. However, two F1 hybrids involving CMS line with T. timopheevii and Aegilops speltoides cytoplasm did not produce any seed upon selfing when crossed with PWR: 4099R and PWR 4101R. A very high frequency (87.14%) of test crosses was male sterile and was accordingly classified as complete maintainers. The intermediate category (partial maintainers and partial restorers) accounted for 10%, while the frequency of complete restorers was only 2.31%..