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The Genetics of Self-Incompatibility in the Genus Schlumbergera (Cactaceae)

1997; Oxford University Press; Volume: 88; Issue: 3 Linguagem: Inglês

10.1093/oxfordjournals.jhered.a023090

1465-7333

T. H. Boyle,

Plant Parasitism and Resistance

The genetics of self-incompatibility (SI) was studled in the genus Schlumbergera Lemaire. Nineteen F1 progeny were intercrossed in a full diallel and reciprocally backcrossed to both parents (Schlumbergera Rocket and Buckleyi, 2n = 2x = 22). Four intra-incompatible but reciprocally compatible classes were obtained in the diallel. All F1 progeny were reciprocally cross-compatible with both parents. Three F2 families were generated and 13 to 14 seedlings in each F2 family were tested for their incompatibility responses. Results of all crosses were consistent with a one-locus, multiallelic SI system under gametophytic control. Schiumbergera has tricellular pollen and dry stigmas with a papillate receptive surface and these features are typically associated with sporophytic SI systems. This is the first report on the inheritance of SI for the Cactaceae, a family of ≈1500 species that exhibits SI in at least 28 of its 98 genera (29%).