Summary
The cytoplasmic-genetic male sterile line, ‘Krishna-A’ with ‘Kalinga-I’ cytoplasm was developed in rice through repeated backcrossing the completely pollen sterile F1 of the cross ‘Kalinga-I/Krishna’ with the recurrent male parent cv. Krishna. The germination percentage and root-shoot length in ‘Krishna-A’ at 12°C and 9°C indicated a higher degree of tolerance to low temperature than the cold tolerant female parent ‘Kalinga-I’. The high yielding cold tolerant variety ‘Kalinga-I’ was developed from a cross involving the cold tolerant variety ‘Dunghansali’ and the high yielding variety ‘IR 8’. It is inferred that tolerance to low temperature during germination in ‘Krishna-A’ was inherited from the cytoplasm of cv. Dunghansali through ‘Kalinga-I’ besides male sterility. The cytoplasmic control of cold tolerance is reported here for the first time in rice literature. The male sterile line ‘Krishna-A’ because of its tolerance to low temperature would be suitable for the development of hybrid rice especially for areas where low temperature is a problem during germination.
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Ratho, S.N., Pradhan, S.B. Cytoplasmically controlled cold tolerance in a cytoplasmic-genetic male sterile line of rice. Euphytica 58, 241–244 (1991). https://doi.org/10.1007/BF00025255
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DOI: https://doi.org/10.1007/BF00025255