Cyto-genic relationship among cytoplasmic-genetic male sterile, maintainer and restorer lines of rice

Abstract

The cyto-genic relationship was determined among six of the cytoplasmic-genetic male sterility (cms) rice lines: Zhen Shan 97A, V20A (possessing wild rice Oryza sativa f. spontanea or O. perennis cytoplasm?), Yar Ai Zhao A (possessing Gambiaca cytoplasm). Pankhari 203A (possessing Taichung Native 1 cytoplasm), Wu 10A (possessing Chinsurah Boro II or BT cytoplasm), and MS 577A (possessing O. sativa f. spontanea cytoplasm). Based on the results of detailed crosses, the six cms lines were classified into four different cyto-sterility systems as follows: Wu 10A and Pankhari 203A (S₁), Zhen Shan 97A/V20A (S₂), Yar Ai Azhao A (S₃) and MS577A (S₄). The corresponding nuclear genes interacting with a specific cytoplasm to induce sterility in these lines were designated as S₁-rf (for S₁), S₂-rf (for S₂), S₃-rf (for S₃) and S₄-rf (for S₄).