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Variability of the self-incompatibility reaction in Brassica oleracea L. with S15 haplotype

Abstract : Self-incompatibility (SI) is thought to have played a key role in the evolution of species as it promotes their outcrossing through the recognition and rejection of self-pollen grains. In most species, SI is under the control of a complex, multiallelic S-locus. The recognition system is associated with quantitative variations of the strength of the SI reaction; the origin of these variations is still not elucidated. To define the genetic regulations involved, we studied the variability of the SI response in homozygous S15S15 plants in cauliflower. These plants were obtained from a self-progeny of a self-compatible (SC) plant heterozygous for S15, which was generated after five selfing generations from one strongly self-incompatible initial plant. We found a continuous phenotypic variation for SI response in the offspring plants homozygous for the S15 haplotype, from the strict SI reaction to self-compatibility,with a great proportion of the plants being partially selfcompatible (PSC). Decrease in SI levels was also observed during the life of the flower. The number of pollen tubes passing through the stigma barrier was higher when counted 3 or 5 days after pollination than one day after pollination. Analysis of the expression of the two key genes regulating self-pollen recognition in cauliflower, the S-locus receptor kinase (SRK) and S-locus cysteine-rich (SCR/SP11) genes, revealed that self-compatibility or PSC was associated with decreased SRK or SCR/SP11 expression.Our work shows the particularly high level of phenotypic plasticity of the SI response associated with certain S-haplotypes in cauliflower.
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Houria Hadj-Arab, Anne-Marie Chèvre, T. Gaude, Veronique Chable. Variability of the self-incompatibility reaction in Brassica oleracea L. with S15 haplotype. Sexual Plant Reproduction, Springer Verlag, 2009, 23 (2), pp.141-151. ⟨10.1007/s00497-009-0119-y⟩. ⟨hal-02665311⟩



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