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Plant and Cell Physiology, 1992, Vol. 33, No. 6 811-814
© 1992

Short Communication

Self-Incompatibility-Related RNases in Styles of Japanese Pear (Pyrus serotina Rehd.)

Hidenori Sassa1, Hisashi Hirano2 and Hiroshi Ikehashi1

1 Plant Breeding Laboratory, Department of Horticulture, Chiba University Matsudo 648, Matsudo City, Chiba, 271 Japan
2 Growth-Regulating Gene Laboratory, Department of Molecular Biology, National Institute of Agrobiological Resources Kannondai 2-1-2, Tsukuba City, Ibaraki, 305 Japan

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.

(Received February 21, 1992; Accepted June 19, 1992)
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