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Water mediates fertilization in a terrestrial flowering plant
Fan, Yong-Li; Barrett, Spencer C. H.; Yang, Ji-Qin; Zhao, Jian-Li; Xia, Yong-Mei; Li, Qing-Jun
2019
Source PublicationNEW PHYTOLOGIST
ISSN0028-646X
Volume224Issue:3Pages:1133-1141
Abstract

Water-mediated fertilization is ubiquitous in early land plants. This ancestral mode of fertilization has, however, generally been considered to have been lost during the evolutionary history of terrestrial flowering plants. We investigated reproductive mechanisms in the subtropical ginger Cautleya gracilis (Zingiberaceae), which has two pollen conditions - granular and filiform masses - depending on external conditions. We tested whether rain transformed granular pollen into filiform masses and whether this then promoted pollen-tube growth and fertilization of ovules. Using experimental manipulations in the field we investigated the contribution of water-mediated fertilization to seed production. Rain caused granular pollen to form filiform masses of germinating pollen tubes, which transported sperm to ovules, resulting in fertilization and seed set. Flowers exposed to rain produced significantly more seeds than those protected from the rain, which retained granular pollen. Insect pollination made only a limited contribution to seed set because rainy conditions limited pollinator service. Our results reveal a previously undescribed fertilization mechanism in flowering plants involving water-mediated fertilization stimulated by rain. Water-mediated fertilization is likely to be adaptive in the subtropical monsoon environments in which C. gracilis occurs by ensuring reproductive assurance when persistent rain prevents insect-mediated pollination.

Keywordautonomous self-pollination ginger pollen germination pollinator limitation rain adaptation reproductive assurance water-mediated fertilization
Subject AreaPlant Sciences
DOI10.1111/nph.15873
Indexed BySCI
Language英语
WOS IDWOS:000491130900015
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11552
Collection植物进化生态研究组
Affiliation1.[Fan, Yong-Li
2.Yang, Ji-Qin
3.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China
4.Chinese Acad Sci, Ctr Plant Ecol, Core Bot Gardens, Mengla 666303, Yunnan, Peoples R China
5.State Forestry & Grassland Adm, Kunming Survey & Design Inst, Kunming 650216, Yunnan, Peoples R China
6.[Barrett, Spencer C. H.] Univ Toronto, Dept Ecol & Evolutionary Biol, 25 Willcocks St, Toronto, ON M5S 3B2, Canada
7.[Zhao, Jian-Li
8.Yunnan Univ, Yunnan Key Lab Plant Reprod Adapt & Evolutionary, Kunming 650091, Yunnan, Peoples R China
9.State Key Lab Conservat & Utilizat Bioresources Y, Lab Ecol & Evolutionary Biol, Kunming 650216, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Fan, Yong-Li,Barrett, Spencer C. H.,Yang, Ji-Qin,et al. Water mediates fertilization in a terrestrial flowering plant[J]. NEW PHYTOLOGIST,2019,224(3):1133-1141.
APA Fan, Yong-Li,Barrett, Spencer C. H.,Yang, Ji-Qin,Zhao, Jian-Li,Xia, Yong-Mei,&Li, Qing-Jun.(2019).Water mediates fertilization in a terrestrial flowering plant.NEW PHYTOLOGIST,224(3),1133-1141.
MLA Fan, Yong-Li,et al."Water mediates fertilization in a terrestrial flowering plant".NEW PHYTOLOGIST 224.3(2019):1133-1141.
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