Summary
Diallels and backcrosses among self-incompatible (SI) clones and progeny of Ageratum houstonianum Mill. could be organized into intra-incompatible classes. Four of 5 progenies segregated in expected ratios of S genotypes. Ageratum expressed a one-locus incompatibility system of the sporophytic type with a linear dominance series of multiple alleles and complete allelic dominance in both pollen and stigma. In the second part of the study, a high percentage of self-seed set was observed during the first flowering of a progeny from a pseudo-self compatible (PSC) seed source. Six progenies were derived from the PSC seed source. Five of the 6 segregated PSC ∶ SI plants, 4 of which fit a 3 ∶ 1 ratio of PSC ∶ SI plants. All plants of the sixth progeny were SI. Two F1 progenies with the same PSC pollen parent produced significantly different segregations of PSC ∶ SI plants. It appeared that PSC acted as a major gene when the most recessive S allele was also present, but PSC was not expressed when the most dominant S allele was present. Clones propagated from PSC plants were SI and cross incompatible with a related S-allele tester. Thus, PSC was transient in that it was apparent in seed-propagated plants but not in plants clonally propagated from the PSC individuals.
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Literature
Ascher, P.D. (1976): Self-incompatibility systems in floriculture crops. Acta Hortic. 63, 205–215
Brewer, J.G.; Parlevliet, J.E. (1969): Incompatibility as a new method for identification of pyrethrum clones. Euphytica 18, 320–325
Crowe, L.K. (1954): Incompatibility in Cosmos bipinnatus. Heredity 8, 1–11
Drewlow, L.W.; Ascher, P.D.; Widmer, R.E. (1973): Genetic studies of self incompatibiliy in the garden chrysanthemum. Theor. Appl. Genet. 43, 1–5
Eenink, A.H. (1981): Compatibility and incompatibility in witloofchicory (Cichorium intybus L.). 2: The incompatibility system. Euphytica 30, 77–85
Gerstel, D.U.; Riner, M.E. (1950): Self-incompatibility studies in guayule. 1: Pollen-tube behavior. J. Hered. 41, 49–55
Gerstel, D.U. (1950): Self-incompatibility studies in guayule. 2: Inheritance. Genetics 35, 482–506
Habura, E. (1957): Parasterilität bei Sonnenblumen. Z. Pflanzenzücht. 37, 280–298
Hughes, M.B.; Babcock, E.B. (1950): Self-incompatibility in Crepis foetida (L.) subsp. rhoedifolia. Genetics 35, 570–588
Imrie, B.C.; Knowles, P.F. (1971): Genetic studies of self incompatibility in Carthamus flavescens. Crop Sci. 11, 6–9
Reimann-Phillipp, R. (1965): The application of incompatibility in plant breeding. In: Genetics today 3, pp. 649–656. The Hague: XI. Int. Cong. Genet. 1963
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Communicated by H. F. Linskens
Scientific Journal Series Paper Number 12,299 of the Minnesota Agricultural Experiment Station
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Stephens, L.C., Ascher, P.D. & Widmer, R.E. Genetics of self incompatibility in diploid Ageratum houstonianum mill. Theoret. Appl. Genetics 63, 387–394 (1982). https://doi.org/10.1007/BF00303913
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DOI: https://doi.org/10.1007/BF00303913