Abstract
Though autotetraploid ryegrasses are as self-incompatible as the diploids from which they have been induced, hitherto it has not been known for certain whether only one S-Z pair in the pollen of tetraploids must 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). Having determined, in the previous investigation, the incompatibility genotypes of the members of two families of autotetraploid ryegrass (Fearon et al., 1984), it is now possible to decide which of these hypotheses is true by using pollen from each of these tetraploids on the stigmas of related diploids of known genotype.
The results of this part of the investigation of the inheritance and expression of self-incompatibility in autotetraploid ryegrass show with very little doubt that the first hypothesis is true; that is, only one S-Z pair of the pollen of tetraploids needs to be matched in the stigma for incompatibility to occur.
The effects of both aneuploidy and of double reduction on our ability to distinguish between the pattern of pollinations expected on each hypothesis are considered; it is shown that neither of these disturbances is likely to reduce our ability to discriminate between the two hypotheses.
These results thus confirm those of Lundqvist (1957, 1962), which were obtained from investigations on autotetraploid rye and Festuca pratensis.
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Fearon, C., Hayward, M. & Lawrence, M. Self-incompatibility in ryegrass VIII. the mode of action of S and Z alleles in the pollen of autotetraploids of Lolium perenne L.. Heredity 53, 415–422 (1984). https://doi.org/10.1038/hdy.1984.98
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DOI: https://doi.org/10.1038/hdy.1984.98
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