Stability of cmsC cytoplasmic male sterility in maize and its interactions with genotype and environment
1989
Vidakovic, M. (Institute of Field and Vegetable crops, Novi Sad (Yugoslavia))
The stability of male sterility in 12 cmsC nonrestored genotypes (inbred lines and hybrids) was evaluated in two years and two locations. The degree of male sterility (fertility) was measured through three parameters: (1) fertility rating (1-5); (2) percentage of plants shedding pollen; and (3) fertility index (relative fertility of cmsC stocks compared with their isogenic counterparts in the N-cytoplasm). The results indicated that the interaction of cytoplasm and nuclear genes (genetic background) was of decisive importance for the stability of male sterility, while the interaction of cytoplasms and environment was of limited importance. In crosses between cmsC and nonrestorer inbreds, both positive and negative complementations for the rate of fertility were found. In one to the studied cases, the number of genes provoking late break of cmsC male sterility proved to be very low, probably one or several. The elimination of this "modifying gene(s)" resulted in complete and stable male sterility of the inbred itself and its inability to make any complementation, for the rate of fertility (sterility), in its crosses.
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