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Further Studies on the Inheritance of a Self-Compatibility Response to Temperature and the Segregation of S Alleles in Diploid Alsike Clover¹

Inheritance of a self-compatibility response to a 32-C temperature and segregation of S alleles were studied in the F₁ and F₂ progenies of a cross between two temperature-sensitive I₁ clones of diploid alsike clover (Trifolium hybridum L.). Temperature sensitivity (T) was inherited on a digenic banffs in the F₁ progeny and was dominant to temperature insensitivity (t). The same two loci controlled temperalure sensitivity in both clones. The S alleles segregated in a l:l:l:l ratio. However, all temperature-insensitive plants were of one S genotype.

Of 10 F₂ progenies evaluated, segregation for temperature sensitivity was 3 T:I t in three progenies, 15 T:I t in five progenies, and 9 T:7 t in one progeny. One progeny with a very high frequency of temperature-insensitive plants did not fit any acceptable ratio. Segregation ratios for the S allele genotypes were influenced by S allele combinations and individual F₁ parents.

The data confirm the previously proposed two.gene model for the inheritance of temperature sensitivity in these two parent clones with an interaction between S allele genotype and temperature sensitivity.

Key Words: Self-incompatibility • Selective fertilization • Temperature sensitivity • Epistasis

² Inheritance of a self-compatibility response to a 32-C temperature and segregation of S alleles were studied in the F₁ and F₂ progenies of a cross between two temperature-sensitive I₁ clones of diploid alsike clover (Trifolium hybridum L.). Temperature sensitivity (T) was inherited on a digenic banffs in the F1 progeny and was dominant to temperature insensitivity (t). The same two loci controlled temperalure sensitivity in both clones. The S alleles segregated in a l:l:l:l ratio. However, all temperature-insensitive plants were of one S genotype.

Of 10 F₂ progenies evaluated, segregation for temperature sensitivity was 3 T:I t in three progenies, 15 T:I t in five progenies, and 9 T:7 t in one progeny. One progeny with a very high frequency of temperature-insensitive plants did not fit any acceptable ratio. Segregation ratios for the S allele genotypes were influenced by S allele combinations and individual F₁ parents.

The data confirm the previously proposed two.gene model for the inheritance of temperature sensitivity in these two parent clones with an interaction between S allele genotype and temperature sensitivity.

Received for publication April 8, 1971.