Reproductive biology of an alpine orchid Phaius delavayi

Li, P.; Zheng, Guiling; Dafni, Amots; Luo, Yi‐Bo

doi:10.1007/s00606-010-0296-z

Cited by 19 publications

(11 citation statements)

References 27 publications

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“…However, in the study, D. wangliangii lacked nectar and odors. The loss of attraction and reward for D. wangliangii may lead to a deficiency of effective pollinators under natural conditions, which was coincident with previous findings demonstrating a common trend of pollinator scarcity in drought conditions and high mountains (Blionis & Vokou, ; Li, Zheng, Dafni, & Luo, ; Liu et al, ; Totland, ). Pollinator scarcity may drive evolutionary shift from cross‐pollination to self‐pollination (Xiong, Fang, & Huang, ).…”

Section: Discussionsupporting

confidence: 87%

A novel case of autogamy and cleistogamy in Dendrobium wangliangii: A rare orchid distributed in the dry‐hot valley

Wang

Shao

et al. 2019

Ecology and Evolution

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Dendrobium wangliangii is an epiphytic orchid distributed in the Jinshajiang dry‐hot valley in Luquan County, Yunnan Province, China. Most Dendrobium spp. typically have a low fruit set, but this orchid shows a higher fruit set under natural conditions despite the lack of effective pollinators. The pollination biology of the critically endangered D. wangliangii was investigated in this study. A fruit set rate of 33.33 ± 4.71% was observed after bagging treatment in 2017 and a high fruit set rate (65.72 ± 4.44% in 2011; 50.79 ± 5.44% in 2017) was observed under natural conditions, indicating that D. wangliangii is characterized by spontaneous self‐pollination. The anther cap blocked the growing pollinium; thus, the pollinium slid down and reached the stigmatic cavity, leading to autogamous self‐pollination. Specifically, 51.50% of 162 unopened flowers (total 257 flowers) of this Dendrobium species under extreme water‐deficit conditions developed into fruits, suggesting the presence of cleistogamy in D. wangliangii. Here, cleistogamy may represent the primary mode of pollination for this orchid. Spontaneous self‐pollination and specific cleistogamous autogamy could represent major adaptions to the drought and pollinator‐scarce habitat in the Jinshajiang dry‐hot valley.

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Section: Discussionsupporting

confidence: 87%

A novel case of autogamy and cleistogamy in Dendrobium wangliangii: A rare orchid distributed in the dry‐hot valley

Wang

Shao

et al. 2019

Ecology and Evolution

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“…To examine whether C. dayanum is self‐compatible and whether it is pollinator dependent, 33 intact flowers were selected randomly on October 21, 2016 at site K. Each flower was subjected to one of the following treatments: (a) self‐pollination with one pollinarium from the same flower; (b) cross‐pollination with one pollinarium from a flower of a different plant; or (c) no pollination. The perianth segments of all the treated flowers were then trimmed off to prevent natural pollination (Li, Zheng, Dafni, & Luo, ; Sugiura, ; Sugiura, ). On January 18, 2017, the flowers were checked to determine whether their ovaries had developed into swollen green capsules.…”

Section: Methodsmentioning

confidence: 99%

Specialized pollination by honeybees inCymbidium dayanum, a fall–winter flowering orchid

Matsuda

Sugiura

2019

Plant Species Biology

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Floral biology and pollination mechanisms of Cymbidium dayanum, an endangered epiphytic orchid, were investigated in south Kyushu, Japan. The flowering period spanned approximately 4 months from fall to winter, with the inflorescences often blooming asynchronously on each plant and individual flowers commonly lasting for a month. The nectarless flowers are self‐compatible but cannot autonomously self‐pollinate; the orchid needs to attract pollinators by deceit for capsule production. The field observations showed that the flowers were pollinated exclusively by the Japanese honeybee Apis cerana japonica, despite its long flowering period. The worker bees pollinated flowers and/or received the pollinarium on the thorax, while escaping from the labellum chamber. The natural fruit‐set ratios at the population level, an estimate of pollination success, varied interannually but were generally low, as the result of infrequent flower visits by honeybee workers owing to the cold winter climate and the lack of a nectar reward. Because most flowers that were artificially pollinated in the winter successfully developed into capsules, the coldness was not considered a direct cause of the low fruit‐set ratios. Our results explicitly indicate that the bee pollination niche could be available to temperate plant species even during mid‐winter. We inferred advantages for the winter flowering of C. dayanum.

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“…The single flower of three Cypripedium species has two anthers with pollinaria or pollen mass and each flower of the two multiple‐flowered species has two pollinaria (four pollinia per pollinarium in P. delavayi , and one pollinium per pollinarium in P. chusua ) that lie above the spur entrance (Figures and ). All species are self‐compatible, but fruit production depends on pollinators (Li, ; Li, Luo, Bernhardt, Yang, & Kou, ; Li, Zheng, Dafni, & Luo, ; Sun et al., ; Zheng, Li, Pemberton, & Luo, ; Table ).…”

Section: Methodsmentioning

confidence: 99%

Pollen limitation, reproductive success and flowering frequency in single‐flowered plants

Hui

Bao-qiang

et al. 2017

Journal of Ecology

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Reproductive biology of an alpine orchid Phaius delavayi

Cited by 19 publications

References 27 publications

A novel case of autogamy and cleistogamy in Dendrobium wangliangii: A rare orchid distributed in the dry‐hot valley

A novel case of autogamy and cleistogamy in Dendrobium wangliangii: A rare orchid distributed in the dry‐hot valley

Specialized pollination by honeybees inCymbidium dayanum, a fall–winter flowering orchid

Pollen limitation, reproductive success and flowering frequency in single‐flowered plants

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