Summary
S-alleles of self-incompatibility were isolated from a wild population of Brassica campestris growing at Balcesme, Turkey. Out of 88 plants observed, 73 were self-incompatible and 4 were self-compatible. In certain families, selfed progenies from a self-incompatible plant segregated into fewer than three incompatibility classes, which is consistent with a one-locus sporophytic genetic control of self-incompatibility. Out of 25 combinations of S-alleles tested, dominance interactions were observed in 6 of them on the pollen side and on 5 of them on the stigma side. The 35 S-homozygotes thus isolated consisted of 18 independent S-alleles. The number of S-alleles in this population was estimated to be more than 30. The S-locus glycoproteins (SLGs) corresponding to the respective S-alleles were identified by iso-electric focusing (IEF)-gel immunoblotting with a polyclonal antiserum against SLG8. SLGs in a stigma were generally composed of several bands, one major and a few minor ones, whose molecular weight was similar to each other, and the major and minor bands were heritable in correlation with each other. SDS-PAGE analysis of SLGs differentiated a few juxtaposed bands between 50 and 60 kDa, and the variations in these bands were considered to be due to differences in the number of polysaccharide residues. General features of the variation of S-genes and their SLGs between the populations in Balcesme, Turkey and Oguni, Japan, were comparatively similar to one another, despite the different surroundings and history of these populations.
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Sup Nou, I., Watanabe, M., Isuzugawa, K. et al. Isolation of S-alleles from a wild population of Brassica campestris L. at Balcesme, Turkey and their characterization by S-glycoproteins. Sexual Plant Reprod 6, 71–78 (1993). https://doi.org/10.1007/BF00227586
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DOI: https://doi.org/10.1007/BF00227586