Evaluation of CMS lines for different allogamic traits that influence out crossing in Rice (Oryza sativa L.)

Abstract. 24 CMS lines of rice derived from wild abortive male sterility source were evaluated for various agronomical and floral traits. Out of 24 CMS lines IR68897A, IR68628A, IR68886A, IR68896A, IR68280A, APMS6A, DRR6A were completely pollen sterile. For all other CMS lines spikelet fertility ranged from 0.1%-3.6%. The CMS lines IR69617A, IR68275A, IR68893A, IR58025A, IR68628A, IR68902A, DRR6A, PUSA6A, IR68897A, IR62829A, IR68280A, IR68896A, IR75603A and IR68886A were exhibited more than 70 % panicle exertion. Stigma exertion of more than 30 % was observed in the CMS lines IR75601A, IR62829A, IR68897A, IR69617A, IR64608A, IR68899A, IR58025A, IR68886A, IR68280A, IR68275A, IR68893A, IR64607A and DRR6A. Natural out crossing ranged from 14.8% - 51% and 14 CMS lines had more than 35 % out-crossing. CMS lines IR58025A, IR62829A, IR68897A, IR68886A, IR68896A, IR69617A (Basmati type), and IR75601A were found promising CMS lines for good phenotypic acceptability characters viz., pollen sterility, panicle exertion, stigma exertion, natural out-crossing and medium duration which offer better scope for utilizing these CMS lines for the development of high yielding rice hybrids