HomeInternational Rice Research Notesvol. 23 no. 1 (1998)

Fertility restoration studies in four WA CMS lines of rice

S L. Kumari | M. Mahadevappa | R. S. Kulkarni

Discipline: Agriculture, Genetics

 

Abstract:

Fertility restoration studies involving four wild abortive (WA) cytoplasmic male sterile (CMS) lines-V20A, IR58025A, IR62829A, and IR54752A- resulted in the identification of 20 restorers. We studied segregation for fertility in the F2 and backcross pro- genies of these CMS lines with four restorer lines-ARC11353, IR30864, IR13419-113-3, and IR9761-19-1. The results indicated that fertility restoration in WA CMS lines was controlled by two additive major genes. Their effect was sporophytic and they displayed differential gene interactions such as epistasis with complete dominance (12:3:1) or epistasis with incomplete dominance (9:6:1) depending on the parents involved in the cross.