Plasticity of the self-incompatibility phenotype in Brassica oleracea
Self-incompatibility (SI) is a mechanism adopted by many flowering plants to prevent selfing and promote outcrossing. In Brassicaceae, SI is under the control of a complex multiallelic S locus which contains at least three genes that co-segregate with the SI phenotype. This recognition system is associated with quantitative variation of the strength of the SI reaction. We analyzed the variability of the SI response in different lines of Brassica oleracea and in homozygous plants for three Class II haplotypes (S15S15, S5S5 and S2S2). We found a continuous phenotypic variation for SI response in plants with heterogeneous and plants with homogenous genetic backgrounds, from the strict SI reaction to self-compatibility. The self-incompatible response varies in each line but the variation is much greater in wild cabbage compared to the cultivated groups. The plants described in this study, constitute a material of choice to identify new mechanisms that could contribute to clarify the extent of phenotypic plasticity in SI.
Hadj-Arab, H., Chèvre, A.M. and Chable, V. (2019). Plasticity of the self-incompatibility phenotype in Brassica oleracea. Acta Hortic. 1231, 109-114
partial-self-compatibility, quantitative variation, pollen tube growth, Class II haplotypes, S-locus, cabbage