期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 28, 期 8, 页码 1526-1541出版社
WILEY
DOI: 10.1111/jeb.12673
关键词
Chiloglottis aff; jeanesii; Chiloglottis valida; clonality; mating system; microsatellite; multiple paternity; outcrossing; paternity; pollen flow; sexually deceptive
资金
- Australian National University
- Australian Pacific Science Foundation [APSF 08/6]
- Australian Research Council [DP045137, DP1094453]
The majority of flowering plants rely on animals as pollen vectors. Thus, plant mating systems and pollen dispersal are strongly influenced by pollinator behaviour. In Australian sexually deceptive orchids pollinated by male thynnine wasps, outcrossing and extensive pollen flow is predicted due to floral deception, which minimizes multiple flower visitations within patches, and the movement of pollinators under mate-search rather than foraging behaviours. This hypothesis was tested using microsatellite markers to reconstruct and infer paternity in two clonal, self-compatible orchids. Offspring from naturally pollinated Chiloglottis valida and C.aff. jeanesii were acquired through symbiotic culture of seeds collected over three seasons. In both species, outcrossing was extensive (t(m)=0.924-1.00) despite clone sizes up to 11m wide. The median pollen flow distance based on paternity for both taxa combined was 14.5m (n=18, range 0-69m), being larger than typically found by paternity analyses in other herbaceous plants. Unexpectedly for orchids, some capsules were sired by more than one father, with an average of 1.35 pollen donors per fruit. This is the first genetic confirmation of polyandry in orchid capsules. Further, we report a possible link between multiple paternity and increased seed fitness. Together, these results demonstrate that deceptive pollination by mate-searching wasps enhances offspring fitness by promoting both outcrossing and within-fruit paternal diversity.
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