Isoelectric focusing revealed that S-genotypes of Japanese pear varieties with gametophytic self-incompatibility were correlated with the isoforms of their stylar RNases. In a self-compatible mutant, the S-allele-related band was much less intense than in the original variety. These observations suggest that the RNase isoforms may be the stylar products of S-genes.
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Sassa et al. (1992) studied this question.