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Annals of Botany 85 (Supplement A): 95-103, 2000
© 2000 Annals of Botany Company

Mutational Approaches to the Study of Self-incompatibility: Revisiting the Pollen-part Mutants

J. F. Golz 1, A. E. Clarke 2, and E. Newbigin 2

1 Institute of Cell and Molecular Biology, Rutherford Building, Kings Building's, Mayfield Road, Edinburgh, EH9 3JH, UK
2 Plant Cell Biology Research Centre, School of Botany, The University of Melbourne, Victoria, 3010 Australia

Fax +613-9347-1071, e.newbigin{at}botany.unimelb.edu.au

We present a review of literature on the genetics of pollen-part mutations created in plants with a gametophytic self-incompatibility system. Plants carrying a pollen-part mutation produce pollen with an altered self-incompatibility response but have styles that display a normal response. Pollen-part mutants in the Fabaceae and Onagraceae have a simple loss-of-function mutation at the S locus and this is also believed to be true of pollen-part mutants from the Rosaceae. In the Solanaceae, pollen-part mutations are more complex and are frequently associated with a duplicated S allele. This suggests that pollen-part mutations, at least in the Solanaceae, can also result from gain-of-function mutations. Some solanaceous plants with a pollen-part mutation apparently lack duplicated S alleles suggesting that the mutant phenotypes arise from lesions at the S locus. These studies are discussed in the context of current self-incompatibility models.

Self-incompatibility, pollen-part mutants, S-RNases, pollen-S, tetraploids, competitive interaction, S-RNase inhibitor

Submitted on August 9, 1999
Revised on September 14, 1999
Accepted on November 19, 1999


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