Hybrid rice research in Egypt
1994
Maximos, M.A. | Aidy, I.R. (Rice Research and Training Center, Sakha (Egypt))
Hybrid rice research in Egypt started in 1982. Test-crosses to determine natural fertility restoration of Egyptian varieties on two Chinese cytoplasmic male sterile (CMS) lines, V20A and Zhen Shan 97A, were made. The work was extended to include evaluation of certain CMS lines introduced from the International Rice Research Institute and elsewhere. Yield tests were also conducted to evaluate yields and agronomic characteristics of some F1 hybrids received from different sources. Seed production studies in isolated areas were conducted to evaluate yields and seed setting percentage of CMS lines planted with restorers or maintainer lines in a row ratio of 8A:2R or B. Studies revealed that Egyptian japonica varieties have little or no fertility-restoring ability on the wild abortive CMS source. Sterility of most CMS lines examined under Egyptian conditions was almost complete, according to microscopic tests of the pollen grains, and seed setting percent under bagged panicle ranged from 0.00 to 1.63 percent. In yield tests of F1 hybrids, some gave yields comparable with the best commercial varieties. Seed yields of the hybrids in the isolated plots with row ratio of 8A:2R or B ranged from 1.0 to 1.2 t/ha
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