Current knowledge and future outlook on cytoplasmic genetic male sterility and fertility restoration in rice
1985
Virmani, S.S. | Raj, K.G. | Casal, C.
Cyto-sterile rice lines developed so far have been classified into four different groups. However, only one system (WA or S2) has been used mostly to develop rice hybrids. Identification and use of additional sources of cytosterility is considered very important to prevent potential vulnerability of hybrid rice to a disease and insect epidemic. Cyto-sterility systems in rice are known to be gametophytic or sporophytic in nature. Their pollen abortion pattern is different cyto-histologically. The pollen abortion factor is believed to be present within the pollen grains in gametophytic CMS lines. While in sporophytic CMS lines pollen abortion occurs due to tapetal cells persistence and hypertrophy. A number of effective restorers for some cyto-sterile lines are available. Fertility restoration appears to be under digenic control wherein one gene is stronger than the other. A sporophyte-gametophyte gene interaction model has been proposed to interpret some results obtained on genetics of fertility restoration
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