Photosynthetic depression in relation to plant architecture in two alpine herbaceous species

NWIPB OpenIR

	Photosynthetic depression in relation to plant architecture in two alpine herbaceous species
	Cui, XY ; Tang, YH ; Gu, S ; Nishimura, S ; Shi, SB ; Zhao, XQ
	2003-10-01
发表期刊	ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷号	50 期号:2 页码:125-135
文章类型	Article
摘要	The Qinghai-Tibet Plateau is characterized by extremely high radiation, which may induce down-regulation of photosynthesis in plants living in this alpine ecosystem. To clarify whether photoinhibition occurs in the alpine environment and to discern its underlying mechanisms, we examined photosynthetic gas exchange and fluorescence emission in response to the changes in photosynthetic photon flux density (PPFD) and leaf temperature under natural regimes for two herbaceous species: prostrate Saussurea superba and erect-leaved Saussurea katochaete from altitude 3250 m on the Qinghai-Tibet Plateau. S. superba intercepted a higher maximum PPFD and experienced much higher leaf temperature than the erect-leaved S. katochaete. S. superba exhibited a much higher light saturation point for photosynthesis than S. katochaete. Under controlled conditions, the former species had higher CO2 uptake rates and neither species showed obvious photosynthetic down-regulation at high PPFD. Under natural environmental conditions, however, apparent photoinhibition, indicated by reduced electron transport rate (ETR), was evident at high PPFD for both species. After a night frost, the photochemistry of S. katochaete was depressed markedly in the early morning and recovered by mid-day. After a frost-free night, it was high in the morning and low at noon due to high radiation. S. superba did not respond to the night frost in terms of daytime photochemical pattern. In both species, photochemical depression was aggravated by high leaf temperature and the erect species was more sensitive to high temperature. This study suggests that the high radiation on the Qinghai-Tibet Plateau is likely to induce rapidly reversible photoinhibition, which is related closely to plant architecture. Photochemistry in the prostrate species seems able to tolerate higher PPFD, without obvious suppression, than the erect species. (C) 2003 Elsevier Science B.V. All rights reserved.; The Qinghai-Tibet Plateau is characterized by extremely high radiation, which may induce down-regulation of photosynthesis in plants living in this alpine ecosystem. To clarify whether photoinhibition occurs in the alpine environment and to discern its underlying mechanisms, we examined photosynthetic gas exchange and fluorescence emission in response to the changes in photosynthetic photon flux density (PPFD) and leaf temperature under natural regimes for two herbaceous species: prostrate Saussurea superba and erect-leaved Saussurea katochaete from altitude 3250 m on the Qinghai-Tibet Plateau. S. superba intercepted a higher maximum PPFD and experienced much higher leaf temperature than the erect-leaved S. katochaete. S. superba exhibited a much higher light saturation point for photosynthesis than S. katochaete. Under controlled conditions, the former species had higher CO2 uptake rates and neither species showed obvious photosynthetic down-regulation at high PPFD. Under natural environmental conditions, however, apparent photoinhibition, indicated by reduced electron transport rate (ETR), was evident at high PPFD for both species. After a night frost, the photochemistry of S. katochaete was depressed markedly in the early morning and recovered by mid-day. After a frost-free night, it was high in the morning and low at noon due to high radiation. S. superba did not respond to the night frost in terms of daytime photochemical pattern. In both species, photochemical depression was aggravated by high leaf temperature and the erect species was more sensitive to high temperature. This study suggests that the high radiation on the Qinghai-Tibet Plateau is likely to induce rapidly reversible photoinhibition, which is related closely to plant architecture. Photochemistry in the prostrate species seems able to tolerate higher PPFD, without obvious suppression, than the erect species. (C) 2003 Elsevier Science B.V. All rights reserved.
关键词	Qinghai-tibet Plateau Photosynthesis Psii Fluorescence Radiation Temperature
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
学科领域	植物学
关键词[WOS]	LOW-TEMPERATURE PHOTOINHIBITION ; DEPENDENT ENERGY-DISSIPATION ; HIGH-MOUNTAIN PLANTS ; PHOTOSYSTEM-II ; CARBON GAIN ; LIGHT ; STRESS ; PROTECTION ; PHOTORESPIRATION ; FLUORESCENCE
收录类别	SCI
语种	英语
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
WOS类目	Plant Sciences ; Environmental Sciences
WOS记录号	WOS:000186161800002
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1407
专题	中国科学院西北高原生物研究所
作者单位	1.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan 2.Natl Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan 3.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China
推荐引用方式 GB/T 7714	Cui, XY,Tang, YH,Gu, S,et al. Photosynthetic depression in relation to plant architecture in two alpine herbaceous species[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2003,50(2):125-135.
APA	Cui, XY,Tang, YH,Gu, S,Nishimura, S,Shi, SB,&Zhao, XQ.(2003).Photosynthetic depression in relation to plant architecture in two alpine herbaceous species.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,50(2),125-135.
MLA	Cui, XY,et al."Photosynthetic depression in relation to plant architecture in two alpine herbaceous species".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 50.2(2003):125-135.

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