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Self-Compatibility Response to Temperature and the Inheritance of the Response in Tetraploid Alsike Clover, Trifolium hybridum L.¹

The compatibility reaction of a self-incompatible clone of tetraploid alsike clover was temperature sensitive in controlled environmental chambers. One to 2 days of constant 90 F or 90 day- 80 F night temperature treatments changed the incompatibility reaction; by the 4th day of treatments, approximately 50% of the selfed florets were setting seed. The 90 day- 70 F night and constant 80 F temperature treatments also affected the incompatibility reaction in 1 to 2 days, but no more than 20% of the selfed florets set seed. After the incompatibility reaction was changed at the 90 to 80 F treatment, propagules were removed and placed at constant 70 F. It took 24 hours to change the compatibility reaction from one of self-compatibility to one of self-incompatibility. S₁ and F₁ progeny data showed that the inheritance of the self-compatibility response to temperature was due to a gene designated as T. The genotype of the temperature-sensitive clone was TTtt, with sensitivity being dominant. The genotype of the nonsensitive parents of the F₁ progenies was tttt. One dose of the T gene was sufficient to give the response. The S genotype of the clone was believed to be triallelic (S₁S₁S₂S₃). No association was observed between temperature sensitivity and S locus genotype.

² Geneticist, Crops Research Division, ARS, USDA, and Special Lecturer. Department of Agronomy, Colorado State University.

Received for publication March 24, 1966.