Photosynthesis in Response to Different Salinities and Immersions of Two Native Rhizophoraceae Mangroves

文化大學機構典藏 CCUR > 環境規劃暨生物資源學院 > 農學院 > 園藝暨生物技術學系 > 期刊論文 > Item 987654321/50423

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题名:	Photosynthesis in Response to Different Salinities and Immersions of Two Native Rhizophoraceae Mangroves
作者:	Chen, Chung-I Lin, Kuan-Hung等
贡献者:	Department of Horticulture and Biotechnology
关键词:	chlorophyll fluorescence;energy quenching;immersion;mangroves;photosynthesis;stomatal conductance chlorophyll fluorescence energy quenching immersion mangroves photosynthesis stomatal conductance
日期:	2022-10
上传时间:	2022-11-22 15:52:18 (UTC+8)
出版者:	MDPI
摘要:	Mangrove ecosystems are vulnerable to rising sea levels as the plants are exposed to high salinity and tidal submergence. The ways in which these plants respond to varying salinities, immersion depths, and levels of light irradiation are poorly studied. To understand photosynthesis in response to salinity and submergence in mangroves acclimated to different tidal elevations, two-year-old seedlings of two native mangrove species, Kandelia obovata and Rhizophora stylosa, were treated at different salinity concentrations (0, 10, and 30 part per thousand, ppt) with and without immersion conditions under fifteen photosynthetic photon flux densities (PPFD μmol photon·m−2·s−1). The photosynthetic capacity and the chlorophyll fluorescence (ChlF) parameters of both species were measured. We found that under different PPFDs, electron transport rate (ETR) induction was much faster than photosynthetic rate (Pn) induction, and Pn was restricted by stomatal conductance (Gs). The Pn of the immersed K. obovata plants increased, indicating that this species is immersed-tolerant, whereas the Pn level of the R. stylosa plants is salt-tolerant with no immersion. All of the plants treated with 30 ppt salinity exhibited lower Pn but higher non-photochemical quenching (NPQ) and heat quenching (D) values, followed by increases in the excess energy and photoprotective effects. Since NPQ or D can be easily measured in the field, these values provide a useful ecological monitoring index that may provide a reference for mangrove restoration, habitat creation, and ecological monitoring.
關聯:	Cells 開放取用卷 11, 期 19 October 2022 論文號碼 3054
显示于类别:	[園藝暨生物技術學系] 期刊論文

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