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THE PLANT CELL, Vol 2, Issue 8 815-826, Copyright © 1990 by American Society of Plant Biologists
Sequence Variability and Developmental Expression of S-Alleles in Self-Incompatible and Pseudo-Self-Compatible Petunia
K. R. Clark, J. J. Okuley, P. D. Collins and T. L. Sims
Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210
We investigated the structure and expression of three S-alleles of Petunia
hybrida in self-incompatible varieties and in a pseudo-self-compatible line
in which the self-incompatibility response is defective. Comparison of
derived amino acid sequences from different gametophytic S-alleles revealed
a pattern of sequence conservation and variability that was highly
nonrandom. In self-incompatible varieties, petunia S-locus mRNA accumulates
preferentially in styles during the transition from bud self-compatibility
to self-incompatibility. S-Allele sequences homologous to the cloned S1
allele were present in a pseudo-self-compatible variety, and were expressed
at levels indistinguishable from those observed in a self-incompatible line
homozygous for the S1, allele. Taken together, our data indicate that (1)
limited sequence differences may confer allelic specificity, (2) S-locus
mRNAs accumulate in a precise organ-specific pattern during floral
development, and (3) the ability to inhibit the growth of incompatible
pollen tubes appears to require a threshold accumulation of the stylar gene
product, along with the participation of as yet undefined pollen gene
products.
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