Pattern of inheritance of a self‐fertility gene in an autotetraploid perennial ryegrass (Lolium perenne) population
A mutation causing self‐fertility (SF) in perennial ryegrass (Lolium perenne L.) 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) if the SF mutation expresses dominance in heterozygous pollen grains. A tetraploidized plant carrying SF alleles was self‐pollinated to create a segregating F2 population. In the F2 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(χ2)≤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.
This is the peer reviewed version of the following article: Do Canto, Javier, Bruno Studer, Ursula Frei, and Thomas Lübberstedt. "Pattern of inheritance of a self‐fertility gene in an autotetraploid perennial ryegrass (Lolium perenne) population." Plant Breeding (2019), which has been published in final form at doi: 10.1111/pbr.12765. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.