| A common feature of the R-lines, selected for the cytoplasm of T.
timopheevi, is their ability to restore male fertility against the
cytoplasms of Ae. speltoides and T. dicoccoides
var. spontaneovillosum. These three cytoplasms belong to the same
plasma type (G) and our results are an evidence in proof of their common
origin and the similarity of their male fertility restoration mechanisms.
Our data show that lines R-17127 and R-3206-143 restore male fertility against the cytoplasm of Ae.triuncialis in combination with the nucleus of Aurora but not with the nucleus of Roussalka. This means that the ability of one R-line to restore male fertility against some source of CMS should be understood in terms of the specific combination between alien cytoplasm, restorer genes and specific genetic background. Luhe et al. (1982) also showed that the common wheat cultivar Prof. Marchal, which carries Rf-genes for the cytoplasm of T. timopheevi can restore male fertility against the cyioplasm of Ae. triuncialis. The data in Table 2 reveal that the restorers for the cytoplasm of T. timopheevi are not effective against the CMS, induced by the cytoplasms of Ae. mutica and Ae. comosa. Conclusions The comparison between the male fertility-restoration abilities of 3 groups of lines, i.e. truebred cultivars, R-lines derived from fertile plants which were found in the course of the backcross procedure, and fertility restorers selected in the hybrid wheat breeding programme proved that the third group shows the highest efficiency. Our study revealed that effective restorer lines against the cytoplasm of T. timopheevi had already been produced in the Institute for Wheat and Sunflower, Bulgaria and they can be used as a basis for further improvement and breeding of R-lines against the cytoplasms of T. dicoccoides var. spontaneovillosum and Ae. speltoides. Referances LUHE. H., G. WURL, I. PANAYOTOV & W. LUHE. 1983. Restoration von zytoplasmatisch mannlich sterilem Winterweizen "Aurora" in zwolf vershiedenen Zytoplasmen von Triticum- and Aegilops-Arten durch sechs T. timopheevi-Restorer. Arch. Zuchtungs-forsch. 12, 6: 353-358. MUKAI, Y., S.S. MAAN, I. PANAYOTOV & K. TSUNEWAKI. 1978. Comparative studies of the nucleuscytoplasm hybrids of wheat produced by three research groups. Proc. 5th. Int. Wheat Genet. Symp., New Delhi: 282-292. PANAYOTOV, I. 1980. New cytoplasmic male sterility sources in common wheat: Their genetical and breeding considerations. Theor. Appl. Genet. 50: 153-160. TSUNEWAKI, K. (Ed.) 1980. Genetic diversity of the cytoplasm in Triticum and Aegilops. pp. 117-119. Jap. Soc. Prom. Sci. WILSON, J. A. & W. M. Ross. 1962. Male sterility interaction of the Triticum aestivum nucleus and Triticum timopheevi cytoplasm. Wheat Inf. Serv. 14: 29-30. |
| <-- Back |