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Exposure to water increased pollen longevity of pondweed (Potamogeton spp.) indicates different mechanisms ensuring pollination success of angiosperms in aquatic habitat
Zhang, Xiao-lin; Gituru, Robert W.; Yang, Chun-feng; Guo, You-hao; Yang, CF, Wuhan Univ, Coll Life Sci, Wuhan 430072, Peoples R China
2010
Source PublicationEVOLUTIONARY ECOLOGY
ISSN0269-7653
Volume24Issue:4Pages:939-953
AbstractPollen longevity in seven Potamogeton species representing different pollination systems (anemophily, epihydrophily and hydroautogamy) was assessed both under aerial condition and in contact with water to investigate how water impacts the sexual reproduction in these aquatic taxa. Stainability of pollen with MTT was considered as an indicator of pollen viability. The half-life of pollen longevity was calculated using exponential decay regression. Overall, pollen viability decreased relatively rapidly with time. Pollen grains of obligate anemophilic species had lower initial viability and shorter half-lives than those of facultative anemophilic species. Pollen in these latter species may take more time to reach the stigma. The pollen of Potamogeton may be categorized as partially hydrated pollen owing to its generally spherical shape and lack of furrows, rapid loss of viability, and fast pollen tube initiation. The half-life is positively correlated with pollen size. Smaller-sized grains are at greater risk of desiccation than larger grains. In contrast with the situation observed in most terrestrial angiosperms, contact with water increases pollen longevity in Potamogeton species. In our present study the half-lives of pollen longevity of Potamogeton species in which the pollen had come into contact with water (mean of 10.65 h) were markedly higher than those under aerial conditions (mean of 5.79 h, t = 2.622, P = 0.039). The results of our study contradict a widely held belief that water is detrimental to pollen viability in angiosperms and furthermore indicate that close proximity to water results in selection for wettability. The transition to a hydrated status together with its morphology, make Potamogeton pollen more adapted to the aquatic environment and thus serves to ensure reproductive process. Results of our present study may have direct implications for understanding the evolution of the sexual reproductive system in aquatic angiosperms.
KeywordPollen Longevity Half-life Selective Pressure Pondweed Potamogeton
Department[Zhang, Xiao-lin; Yang, Chun-feng; Guo, You-hao] Wuhan Univ, Coll Life Sci, Wuhan 430072, Peoples R China; [Zhang, Xiao-lin] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China; [Gituru, Robert W.] Jomo Kenyatta Univ Agr & Technol, Dept Bot, Nairobi 6200000200, Kenya; [Yang, Chun-feng] Chinese Acad Sci, Wuhan Bot Garden, Wuhan 430074, Peoples R China
Subject AreaEcology ; Evolutionary Biology ; Genetics & Heredity
Funding OrganizationNational Natural Science Foundation of China [30430050] ; National Natural Science Foundation of China [30430050] ; National Natural Science Foundation of China [30430050] ; National Natural Science Foundation of China [30430050]
Indexed BySCI
Language英语
WOS IDWOS:000278833400021
Funding OrganizationNational Natural Science Foundation of China [30430050] ; National Natural Science Foundation of China [30430050] ; National Natural Science Foundation of China [30430050] ; National Natural Science Foundation of China [30430050]
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/14392
Collection淡水生态学研究中心_期刊论文
Corresponding AuthorYang, CF, Wuhan Univ, Coll Life Sci, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xiao-lin,Gituru, Robert W.,Yang, Chun-feng,et al. Exposure to water increased pollen longevity of pondweed (Potamogeton spp.) indicates different mechanisms ensuring pollination success of angiosperms in aquatic habitat[J]. EVOLUTIONARY ECOLOGY,2010,24(4):939-953.
APA Zhang, Xiao-lin,Gituru, Robert W.,Yang, Chun-feng,Guo, You-hao,&Yang, CF, Wuhan Univ, Coll Life Sci, Wuhan 430072, Peoples R China.(2010).Exposure to water increased pollen longevity of pondweed (Potamogeton spp.) indicates different mechanisms ensuring pollination success of angiosperms in aquatic habitat.EVOLUTIONARY ECOLOGY,24(4),939-953.
MLA Zhang, Xiao-lin,et al."Exposure to water increased pollen longevity of pondweed (Potamogeton spp.) indicates different mechanisms ensuring pollination success of angiosperms in aquatic habitat".EVOLUTIONARY ECOLOGY 24.4(2010):939-953.
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