Submitted to: Euphytica
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: December 31, 2000
Publication Date: N/A
Interpretive Summary: This brief paper gives the results of a series of four experiments designed to develop rice genetic male steriles that would be fertile in short-day conditions in winter nurseries, and sterile in long-day conditions in summer nurseries. Such reversible male steriles would be extremely valuable for producing hybrid rice. No steriles were found that met the above criteria, but two dominant genetic male steriles, as well as conventional recessive male steriles, were found.
Technical Abstract: The most notable photoperiod sensitive genetic male sterile in rice is the Nongken 58S line in China. Two sources of environmentally sensitive geneti male sterile mutants were found in California. The photoperiod-sensitive genetic male steriles (PGMS) have the potential for reducing hybrid rice breeding from the present 3-line system to a 2-line system. The long-range eobjectives of the present project were to induce an array of genetic male steriles in rice, and then to evaluate these at different day lengths in or to find steriles that become fertile in selected environments. Three genet male steriles were selected through progeny tests in M5 to M7 generations a through fertility characterization of pollen and spikelets. Seed set on steriles under open pollination ranged from a low of 8.1% for Cypress 1819 a high of 32.9% for Kaybonnet 1789.