Summary
Nemesia strumosa plants were discovered which had styles capable of discriminating among incompatible pollen tubes from different pollinators, allowing growth of some but not others. All but 3 of 26 families tested had at least some members with discriminating styles (DS). Presence and level of DS was independent of S genotype. Plants with pseudo-self-compatiblity (PSC) levels greater than 10% had the trait, though many plants with strong DS had PSC levels less than 10%. Self pollination of highly DS plants produced mostly DS offspring, but of differing sensitivities. Some progenies from crosses between a family of highly DS plants and unrelated, probably low DS plants segregated half DS and half non-DS, while others consisted of mostly DS or mostly non-DS. The DS phenomenon is probably caused by PSC genes.
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Literature
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Communicated by H.F. Linskens
Scientific Journal Series Paper No. 11,677 of the Minnesota Agricultural Experiment Station
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Robacker, C.D., Ascher, P.D. Discriminating styles (DS) and pollen-mediated pseudo-self-compatibility (PMPSC) in Nemesia strumosa Benth.. Theoret. Appl. Genetics 60, 297–302 (1981). https://doi.org/10.1007/BF00263722
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DOI: https://doi.org/10.1007/BF00263722