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

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Abstract
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.