Abstract
The two locus gametophytic self-incompatibility system of the grasses entails a maximum of four different S-Z specificities in the diploid pollen of tetra-ploid individuals. It is not known for certain whether only one S-Z pair in such pollen needs to be matched by the same pair in the stigma for incompatibility to occur (hypothesis 1) or whether all such pairs have to be matched (hypothesis 2).
This paper, the first of three, concerns the results obtained from the application of the first stage of a three-stage procedure for the analysis of self-incompatibility in tetraploids. Pollen from diploids of known genotype is applied to the stigmas of related tetraploids in order to determine the incompatibility genotypes of the latter.
The results obtained from two families of tetraploid perennial ryegrass show that the 35 legitimate plants examined fell into 18 of the expected 81 different incompatibility classes, and that the gametic segregation ratios of the parents of these families were consistent with the assumption that the chromosomes segregate at random with respect to the incompatibility loci in tetraploid ryegrass. Furthermore, since it was possible to recognise plants of genotype S3456Z3456 and S3356Z3356, the alleles must act independently in the stigmas of tetraploids with no dosage effects.
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Fearon, C., Hayward, M. & Lawrence, M. Self-incompatibility in ryegrass VII. the determination of incompatibility genotypes in autotetraploid families of Lolium perenne L.. Heredity 53, 403–413 (1984). https://doi.org/10.1038/hdy.1984.97
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DOI: https://doi.org/10.1038/hdy.1984.97
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