By D S Brar; B Hardy
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The restoration of male fertility in the F1 is an important phenomenon by which the success of the hybrid ultimately depends. Therefore, studies on the genetics of fertility restoration can lead to proper understanding of this important phenomenon, especially when the search is for sodic-tolerant restorer lines. Materials and methods A total of 26 male sterile lines representing diverse cytoplasmic male sterility sources, such as wild abortive, O. 25 dS m–1 during the 1998 wet season. Sodicity tolerance was scored for phenotypic acceptability (PACP) immediately after sowing, that is, at germination (3–5 d after emergence), seedling, tillering, flowering, and harvest (maturity), using a 0–9 scale, with 9 being the most susceptible reaction in terms of poor germination, seedling vigor, tillering, flowering, and maturity (spikelet fertility) and 1 indicating that plants are sodic-tolerant.
P. Pandey Thermosensitive genic male sterility (TGMS) in rice is a critical trait for exploiting heterosis, especially of an intersubspecific nature, using the two-line system. In contrast to the reports of its simple and monogenic inheritance, the trait is complexly inherited. Hybrids of TGMS line UPRI 95-140TGMS with 44 normal male fertile lines offered evidence that the genetic background modified the segregation ratios and at least three pairs of major genes were involved in TGMS expression.
Preliminary studies on application of indica photo (thermo) sensitive genic male sterile 5460 S in hybrid rice breeding. Hybrid Rice 1:32-34. Notes References Ali J. 1996. ). PhD thesis. Indian Agricultural Research Institute, New Delhi, India. Authors’ addresses: A. E. Naina Mohammed, R. M. Vijayakumar, Directorate of Rice Research, Hyderabad 500 030, India. B. P. Pandey Thermosensitive genic male sterility (TGMS) in rice is a critical trait for exploiting heterosis, especially of an intersubspecific nature, using the two-line system.