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Self-Compatibility Studies with Diploid Alsike Clover, Trifolium hybridum L. IV. Inheritance of Type II Self-Compatibility in Different Genetic Backgrounds¹

Inheritance of a type of self-compatibility, possessing sporophytic and gametophytic characteristics, was studied in different genotypes of diploid alsike clover, Trifolium hybridum L. This type of self-compatibility was referred to as Type II. The original hypothesis stated that the A₁ allele of the A locus in a heterozygous condition suppressed the action of only the S₁ allele of the S locus in the pollen to give self-compatibility. Results from a series of crosses between self-compatible (SC) and self-incompatible (SI) plants showed that this postulate must be modified. In some crosses, the A₁ allele was found to suppress the action of other S alleles. In other crosses the A₁ allele did not suppress the action of any S alleles because all F₁ plants were SI. When four of these SI F₁ plants were backcrossed to a SC plant, only two of the 46 backcross plants were SC. Thus, the action of the A₁ allele was variable. The number of SI and SC plants obtained in some progenies agreed with those expected according to the hypothesis that the A₁ allele suppressed the action of only the S₁ allele. The frequency of SI and SC plants from two F₁ progenies with the same SC male parentage, differed from the frequency obtained in the progenies of the reciprocal crosses. The reason for the discrepancy is not known. In general, the deviation of the results obtained from those expected, and the complete absence of SC plants in some progenies, can be explained by the presence of modifying genes. Consequently, genetic background had considerable influence on the expression of Type II self-compatibility.

Key Words: Self-incompatibility • Sterility alleles

² Research Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture and Faculty Affiliate, Department of Agronomy, Colorado State University.

Received for publication November 4, 1968.

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