Genetics of fertility restoration of wild abortive cytoplasmic male sterile lines in rice
1994
Singh, P.K. | Thakur, R. | Chaudhary, V.K. (Rajendra Agricultural Univ., Bihar, Pusa, Samastipur 848125 (India). Plant Breeding Dept.)
Two fertility restoration genes, Rf1, and Rf2, are known in rice. Two independent dominant genes govern seed fertility restoration ability of Pankaj and Rajshree; a single dominant gene governs restoration in Pusa 33. The mode of action of the two genes varied in the four crosses. The F2 population of V20A/Rajshree, IR58025 A/Rajshree, and IR58025/Pankaj segregated into a 9-6-1 ratio, revealing epistasis with incomplete dominance. V20A/Pankaj showed dominant epistasis (12:3:1). V20A/Pusa 33 and IR58025 A/Pusa 33 showed monogenic segregation. In Pankaj and Rajshree, Rf1, had a stronger effect on fertility restoration than did Rf2. Fertility restoration was high when both dominant alleles (Rf1, and Rf2) were present. It was less pronounced when only Rf1 was present, and was further reduced (partial fertility) when only Rf2 was present. The double recessive genotype (rf1rf1rf2rf2) did not restore fertility. Only one dominant restorer gene (RfRf) was found in Pusa 33. Variation in seed fertility restoration indicates these genes have different penetrance and are affected by modifiers
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