Leaf orientation, incident sunlight, and photosynthesis in the alpine species Suassurea superba and Gentiana straminea on the Qinghai-Tibet Plateau

	Leaf orientation, incident sunlight, and photosynthesis in the alpine species Suassurea superba and Gentiana straminea on the Qinghai-Tibet Plateau
	Cui, XY ; Tang, YH ; Gu, S ; Shi, SB ; Nishimura, S ; Zhao, XQ
刊名	arctic antarctic and alpine research
	2004-05-01
卷号	36 期号:2 页码:219-228
关键词	LOW-TEMPERATURE PHOTOINHIBITION
合作状况	其它
中文摘要	the extremely high level of solar radiation on the qinghai-tibet plateau may induce photoinhibition and thus limit leaf carbon gain. to assess the effect of high light, we examined gas exchange and chlorophyll fluorescence for two species differing in light interception: the prostrate saussurea superba and the erect-leaved gentiana straminea. in controlled conditions with favorable water and temperature, neither species showed apparent photoinhibition in gas exchange measurements. in natural environment, however, their photosynthetic rate decreased remarkably at high light. photosynthesis depression was aggravated under high leaf temperature or soil water stress. relative stomatal limitation was much higher in s. superba than in g. straminea and it remarkably increased in the later species at midday when soil was dry. f-v/f-m as an indicator for photoinhibition was generally higher in s. superba than in the other species. f-v/f-m decreased significantly under high light at midday in both species, even when soil moisture was high. f-0 linearly elevated with the increment of leaf temperature in g. straminea, but remained almost constant in s. superba. electron transport rate (etr) increased with photosynthetically active photon flux density (ppfd) in s. superba, but declined when ppfd was high than about 1000 mumol m(-2) s(-1) in g. straminea. compared to favorable environment, the estimated daily leaf carbon gain at ppfd above 800 mumol m(-2) s(-1) was reduced by 32% in s. superba and by 17% in g. straminea when soil was moist, and by 43% and 53%, respectively, when soil was dry. our results suggest that the high radiation induces photoinhibition and significantly limits photosynthetic carbon gain, and the limitation may further increase at higher temperature and in dry soil.
英文摘要	the extremely high level of solar radiation on the qinghai-tibet plateau may induce photoinhibition and thus limit leaf carbon gain. to assess the effect of high light, we examined gas exchange and chlorophyll fluorescence for two species differing in light interception: the prostrate saussurea superba and the erect-leaved gentiana straminea. in controlled conditions with favorable water and temperature, neither species showed apparent photoinhibition in gas exchange measurements. in natural environment, however, their photosynthetic rate decreased remarkably at high light. photosynthesis depression was aggravated under high leaf temperature or soil water stress. relative stomatal limitation was much higher in s. superba than in g. straminea and it remarkably increased in the later species at midday when soil was dry. f-v/f-m as an indicator for photoinhibition was generally higher in s. superba than in the other species. f-v/f-m decreased significantly under high light at midday in both species, even when soil moisture was high. f-0 linearly elevated with the increment of leaf temperature in g. straminea, but remained almost constant in s. superba. electron transport rate (etr) increased with photosynthetically active photon flux density (ppfd) in s. superba, but declined when ppfd was high than about 1000 mumol m(-2) s(-1) in g. straminea. compared to favorable environment, the estimated daily leaf carbon gain at ppfd above 800 mumol m(-2) s(-1) was reduced by 32% in s. superba and by 17% in g. straminea when soil was moist, and by 43% and 53%, respectively, when soil was dry. our results suggest that the high radiation induces photoinhibition and significantly limits photosynthetic carbon gain, and the limitation may further increase at higher temperature and in dry soil.
学科主题	生物科学
WOS标题词	science & technology ; life sciences & biomedicine ; physical sciences
类目[WOS]	environmental sciences ; geography, physical
研究领域[WOS]	environmental sciences & ecology ; physical geography
关键词[WOS]	low-temperature photoinhibition ; photosystem-ii ; elevated co2 ; water-stress ; plant form ; light ; acclimation ; conductance ; drought ; forest
收录类别	SCI
语种	英语
WOS记录号	WOS:000225548300009
公开日期	2009-12-09
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/1384]
专题	西北高原生物研究所_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.Chinese Acad Sci, Grad Sch, Beijing 100091, Peoples R China 3.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China 4.Natl Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan
推荐引用方式 GB/T 7714	Cui, XY,Tang, YH,Gu, S,et al. Leaf orientation, incident sunlight, and photosynthesis in the alpine species Suassurea superba and Gentiana straminea on the Qinghai-Tibet Plateau[J]. arctic antarctic and alpine research,2004,36(2):219-228.
APA	Cui, XY,Tang, YH,Gu, S,Shi, SB,Nishimura, S,&Zhao, XQ.(2004).Leaf orientation, incident sunlight, and photosynthesis in the alpine species Suassurea superba and Gentiana straminea on the Qinghai-Tibet Plateau.arctic antarctic and alpine research,36(2),219-228.
MLA	Cui, XY,et al."Leaf orientation, incident sunlight, and photosynthesis in the alpine species Suassurea superba and Gentiana straminea on the Qinghai-Tibet Plateau".arctic antarctic and alpine research 36.2(2004):219-228.