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Title of Journal: Plant Syst Evol

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Abbravation: Plant Systematics and Evolution

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Springer Vienna

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DOI

10.1007/bf02735916

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ISSN

1615-6110

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Autogamous fruit set in a mycoheterotrophic orchid

Authors: Kenji Suetsugu
Publish Date: 2012/12/21
Volume: 299, Issue: 3, Pages: 481-486
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Abstract

Nonphotosynthetic mycorrhizal plants ie mycoheterotrophs have long attracted interest due to their bizarre morphological features Nonetheless few studies have reported on the reproductive biology of these mycoheterotrophs In the present study the pollination mechanism of the mycoheterotrophic orchid Cyrtosia septentrionalis Rchbf Garay in central Japan was investigated In spite of their showy appearance flowers of C septentrionalis failed to attract pollinators and possessed an effective selfpollination system in which the rostellum was poorly developed and lost the ability to physically separate the stigma and pollinia thus allowing contact between them Comparable fruit set ratio was also obtained in bagged plants and following induced autogamous and xenogamous pollinations These results indicate that the species is capable of outbreeding but selfcompatible and not pollinatorlimited for fruit set under natural condition These pollination mechanisms may be adaptations to survive the shaded and sparse herbaceous understory where insectpollinators are limited

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