Diversification of cytoplasmic male sterility in hybrid rice
1989
Wan, Banghui (South China Agricultural Univ., Guangzhou, China)
Cytoplasmic male sterility (CMS) results from the interaction between the sterile gene in the cytoplasm and the corresponding recessive sterile genes in the nucleus. Diversification of CMS in hybrid rice is closely associated with high and stable yields. At present, the CMS belonging genetically to sporophyte or gametophyte possesses different properties. The CMS developed so far can be divided into 7 restoration-maintenance types, according to the relationship between its restorers and maintainers, which are controlled by the male sterile (MS) cytogene. Although hybrid rice yield is determined principally by nuclear background, trial results showed that yield was influenced directly or indirectly by MS cytoplasm. The cytoplasm and the nucleus affect outcrossing rates and agronomic traits of CMS lines. Hybrid indica rice with WA (wild rice with abortive pollen) cytoplasm and hybrid japonica rice with BT (Chinsurah Boro 11) demand for developing commercial hybrid rices. But the vulnerability of a single MS cytoplasm cannot be neglected in production, since a number of MS cytoplasm having uniform specificity with WA, BT cytoplasm have been developed. It should be easy to alter the status of a single MS cytoplasm if identification of CMS is speeded up.
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