Pollen flow and effects of population structure on selfing rates and female and male reproductive success in fragmented Magnolia stellata populations

Annals of Occupational and Environmental Medicine

Suzuki Setsuko²  Teruyoshi Nagamitsu²  Nobuhiro Tomaru¹ 

[1] Laboratory of Forest Ecology and Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan

[2] Department of Forest Genetics, Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan

关键词: Seed production;    Pollen dispersal;    Paternity analysis;    Magnoliaceae;    Landscape;    Insect pollination;    Geitonogamy;    Gene flow;    Fragmentation;    Conservation;   

Others  :  1085493
DOI  :  10.1186/1472-6785-13-10

 received in 2012-08-01, accepted in 2013-03-07,  发布年份 2013

【 摘 要 】

Background

Fragmentation of plant populations may affect mating patterns and female and male reproductive success. To improve understanding of fragmentation effects on plant reproduction, we investigated the pollen flow patterns in six adjacent local populations of Magnolia stellata, an insect-pollinated, threatened tree species in Japan, and assessed effects of maternal plant (genet) size, local genet density, population size and neighboring population size on female reproductive success (seed production rates), and effects of mating distance, paternal genet size, population size and separation of populations on male reproductive success.

Results

The seed production rate, i.e. the proportion of ovules that successfully turned into seeds, varied between 1.0 and 6.5%, and increased with increasing population size and neighboring population size, and with decreasing maternal genet size and local genet density. The selfing rate varied between 3.6 and 28.9%, and increased with increasing maternal genet size and with declining local genet density. Male reproductive success increased with increasing paternal genet size, and decreased with increasing mating distance and separation of population. Pollen flow between the populations was low (6.1%) and highly leptocurtic.

Conclusions

Our results indicate that habitat fragmentation, separation and reduced size of populations, affected mating patterns and reproductive success of M. stellata. Local competition for pollinators and plant display size were likely to alter the reproductive success.

【 授权许可】

   
2013 Setsuko et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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