期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 22, 期 9, 页码 1967-1973出版社
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1420-9101.2009.01806.x
关键词
inbreeding depression; inbreeding load; leaky self-incompatibility; mate limitation; mating system; polyploidy; Ranunculaceae; reproductive assurance; S-locus
资金
- Swiss National Science Foundation [3100-056809, 3100-067876, 3100-116270]
Theory of plant mating system evolution predicts the spread of self-compatibility (SC) in a predominantly self-incompatible population when inbreeding depression (ID; the decline in fitness because of selfing) is small and when compatible mates are limited. I tested these two predictions by measuring the occurrence of SC in 13 natural populations of Ranunculus reptans L. that varied in ID and frequency of cross-incompatible mates. Enforced selfing experiments were conducted in 2 years. In the first year, self-pollination was applied at two flower ages to investigate the occurrence of delayed SC. I found that SC was not uncommon across all populations, but self-compatible plants usually produced few seeds. There was no evidence for delayed SC. The occurrence of SC was not associated with population-level ID, but populations with more limited availability of compatible mates had a significantly higher frequency of plants that were at least partially self-compatible. The results indicate that, in R. reptans, a shortage of available mates in small populations may cause the evolution of partial SC and mixed mating.
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