Pollination Systems Inferred from Pollen-Ovule Ratios of Some Species of Podostemaceae
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概要
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Members of the Podostemaceae grow submerged in rapidly flowing water in the rainy season, but are exposed and flower and eventually die in the dry season. Pollen-ovule ratios (P/O) of 20 species in 15 genera in the family were calculated and pollination in some species was observed. We observed that autogamous species have low values of log P/O, while allogamous species have high values. We therefore conclude that species with values of log P/O higher than 2.5 are allogamous, while those with a ratio lower than 2.0 are autogamous. The species of the subfamilies Weddellinoideae and Tristichoideae are inferred to be autogamous. The subfamily Podostemoideae consists of species with various pollination types ranging from allogamy to autogamy and cleistogamy. The ancestor of the family that invaded the specialized aquatic habitat may have been autogamous.
- 日本植物分類学会の論文
- 2002-06-29
著者
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Okada Hiroshi
Botanical Gardens Faculty Of Science Osaka City University
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Kato Masahiro
Department Of Analytical Chemistry Meiji College Of Pharmacy:faculty Of Pharmaceutical Sciences Chib
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