| Autor: |
Stephens, L. C., Ascher, P. D., Widmer, R. E. |
| Zdroj: |
TAG Theoretical and Applied Genetics; December 1982, Vol. 63 Issue: 4 p387-394, 8p |
| Abstrakt: |
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. |
| Databáze: |
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