Effect of population density of compatible neighbours on inbreeding level within a Primula sieboldii population |
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Authors: | N Kitamoto S Ueno Y Tsumura I Washitani R Ohsawa |
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Institution: | (1) Laboratory of Plant Breeding, Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba Ibaraki, 305-8572, Japan;(2) Genome Analysis Laboratory, Department of Forest Genetics, Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan;(3) Laboratory of Conservation Ecology, Department of Ecosystem Studies, Institute of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 311-8657, Japan |
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Abstract: | We investigated the effect of population density of compatible neighbours on inbreeding level of Primula sieboldii, a heterostylous clonal herb. Pollinator availability, seed set, selfing rate, diversity of pollen donors, and fitness of
progenies were compared between less and more isolated genets, which differed in the number of compatible opposite-morph genets
within 20 m, the range at which most pollen flow occurred. Although pollinator availability did not differ between the two
groups, seed set and diversity of pollen donors in more isolated genets were significantly lower than in less isolated genets.
Additionally, the mean selfing rates of less and more isolated genets were 1.3 and 36.7%, respectively, and the mean leaf
area of the self-fertilized seedlings was 70 to 40% smaller than that of outcrossed seedlings of the same mother genet. Due
to this large inbreeding depression, it is unlikely that self-fertilized seedlings could successfully establish in natural
habitats and hence the inbreeding level in the next generation around the more isolated genet would not increase rapidly.
However, the possibility of mating between full-sibs would increase because the diversity of pollen donors was low and both
pollen and seed dispersal were spatially restricted. Thus the inbreeding level of the next generations would gradually increase
around the more isolated genets owing to biparental inbreeding. This study suggested that the population density of compatible
neighbours has a critical impact on the future inbreeding level within P. sieboldii populations. |
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Keywords: | Heterostyly Inbreeding depression Paternity analysis Spatial structure SSR |
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