title: Discriminating styles (DS) and pollen-mediated pseudo-self-compatibility (PMPSC) in Nemesia strumosa Benth. : Part 1: Characteristics and inheritance of DS.
abstract: 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.
authors.affiliation: Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, Minn., USA.
authors.forename: C D
authors.initials: CD
authors.lastname: Robacker
authors.forename: P D
authors.initials: PD
authors.lastname: Ascher