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Pattern of inheritance of a self-fertility gene in an autotetraploid perennial ryegrass (Lolium perenne) population
- Journal Article
A mutation causing self-fertility (SF) in perennial ryegrass was studied at the tetraploid level. The aim of this work was to determine a) whether SF remains functional in a tetraploid population and b) whether the SF mutation expresses dominance in heterozygous pollen grains. A tetraploidized plant carrying SF alleles was self-pollinated to create a segregating F-2 population. In the F-2 individuals, pollen compatibility ranged between 38% and 84% showing that SF remained functional. The SF locus genotype was the main determinant of pollen compatibility explaining 78% of the variation. The observed segregation was significantly different from the expected under both SF being dominant or recessive models (P-(chi 2)<= 0.001) and tended to be intermediate between them, indicating partial dominance or additive gene action. The frequency of the different genotypes suggested that pollen grains homozygous for the mutation have a competitive advantage over heterozygous pollen and that pollen compatibility is affected by the interaction with additional loci. The implications of our results for breeding polyploid grasses are discussed. Show more
Journal / seriesPlant Breeding
Pages / Article No.
Subjectperennial ryegrass; segregation; self-fertility; tetraploid
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