Sporadic self-compatibility, the occasional fruit formation after otherwise incompatible pollinations, has been observed in some S 12-containing genotypes of Solanum chacoense but not in others. We have sequenced this S 12 allele and analyzed its expression in four different genotypes. The S12-RNase levels were generally less abundant than those of other S-RNases present in the same plants. In addition, two-fold and five-fold differences in the amount of S12-RNase and S 12 RNA, respectively, were observed among the genotypes analyzed. A comparison with the genetic data showed that genotypes with the highest levels were fully and permanently self-incompatible, whereas those with the lowest levels were those in which sporadic self-compatibility had been observed. The mature protein contains four potential glycosylation sites and genotype-specific differences in the pattern of glycosylation are also observed. Our results suggest the presence of modifier genes which affect, in a genotype-dependent manner, the level of expression and the post-translational modification of the S12-RNase.
Plant Molecular Biology – Springer Journals
Published: Oct 4, 2004
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