Journal
PLANT ECOLOGY
Volume 204, Issue 1, Pages 43-54Publisher
SPRINGER
DOI: 10.1007/s11258-008-9564-1
Keywords
Acer mono; Heterodichogamy; Microsatellite; Pollination; Disassortative mating; Paternity analysis
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Funding
- Ministry of Education, Science, Sports, and Culture
- Ministry of Agriculture, Forestry, and Fisheries
- Ministry of Environment
- Research Institute for Humanity and Nature, Japan
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Heterodichogamy is a form of sex expression in which protandrous and protogynous individuals coexist, and is considered to be a mechanism that avoids selfing and promotes disassortative mating. We examined mating patterns in a heterodichogamous maple, Acer mono, using microsatellite markers. Parentage analysis revealed a selfing rate of only 9.8%. Disassortative mating between flowering types significantly exceeded within-type mating, but the mating patterns were better explained by flowering phenology (i.e., the temporal overlap between the female and male stages). Heterodichogamy in A. mono thus appears to promote outcrossing without requiring obligate self- or cross-incompatibility systems, although it did not guarantee disassortative mating. Multiple-regression analysis suggested that successful reproduction of pollen parents significantly increased with increased flower production and reciprocal flowering synchrony, but decreased only marginally with mating distance, although the distribution of mating distances suggested leptokurtic dispersal of pollen.
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