Changes in photosynthesis of alpine plant Saussurea superba during leaf expansion

doi:10.1007/s11738-015-1987-4

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	Changes in photosynthesis of alpine plant Saussurea superba during leaf expansion
	Shi, Sheng-Bo 1; Shi, Rui 2; Li, Miao 1
	2015-11-01
发表期刊	ACTA PHYSIOLOGIAE PLANTARUM
卷号	37 期号:11
文章类型	Article
摘要	The native alpine plant Saussurea superba is widely distributed in Qinghai-Tibetan Plateau regions. The leaves of S. superba grow in whorled rosettes, and are horizontally oriented to maximize sunlight exposure. Experiments were conducted in an alpine Kobresia humilis meadow near Haibei Alpine Meadow Ecosystem Research Station (37 degrees 29'-37 degrees 45'N, 101 degrees 12'-101 degrees 33'E; alt. 3200 m). Leaf growth, photosynthetic pigments and chlorophyll fluorescence parameters were measured in expanding leaves of S. superba. The results indicate that leaf area increased progressively from inner younger leaves to outside fully expanded ones, and then slightly decreased in nearly senescent leaves, due to early unfavorable environmental conditions, deviating from the ordinary growth pattern. The specific leaf area decreased before leaves were fully expanded, and the leaf thickness was largest in mature leaves. There were no significant changes in the content of chlorophylls (Chl) and carotenoids (Car), but the ratios of Chl a/b and Car/Chl declined after full expansion of the leaves. The variation of Chl a/b coincided well with changes in photochemical quenching (q(P)) and the fraction of open PSII reaction centers (q(L)). The maximum quantum efficiency of PSII photochemistry after 5 min dark relaxation (F-(v)/F-(m)) continuously increased from younger leaves to fully mature leaves, suggesting that mature leaves could recover more quickly from photoinhibition than younger leaves. The light-harvesting capacity was relatively steady during leaf expansion, as indicated by the maximum quantum efficiency of open PSII centers (F-v(')/F-m(')). UV-absorbing compounds could effectively screen harmful solar radiation, and are a main protection way on the photosynthetic apparatus. The decline of q(P) and q(L) during maturation, together with limitation of quantum efficiency of PSII reaction centers (L-(PFD)), shows a decrease of oxidation state of Q(A) in PSII reaction centers under natural sunlight. Furthermore, light-induced (UNPQ) and non-light-induced quenching (Phi(NO)) were consistent with variation of L-(PFD). It is concluded that the leaves of S. superba could be classified into four functional groups: young, fully expanded, mature, and senescent. Quick recovery from photoinhibition was correlated with protection by screening pigments, and high level of light energy trapping was correlated with preservation of photosynthetic pigments. Increasing of Phi(NPQ) and Phi(NO) during leaves maturation indicates that both thermal dissipation of excessive excitation energy in safety and potential threat to photosynthetic apparatus were strengthened due to the declination of q(P) and q(L), and enhancement of L-(PFD).
关键词	Alpine Plant Chlorophyll Fluorescence Parameters Leaf Growth Photosynthetic Pigments Qinghai-tibetan Plateau Saussurea Superba
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
DOI	10.1007/s11738-015-1987-4
关键词[WOS]	CHLOROPHYLL-A FLUORESCENCE ; UV-B RADIATION ; LIGHT ENERGY ; PHOTOPROTECTION ; PHOTOINHIBITION ; LEAVES ; MANAGEMENT ; RESPONSES ; CYCLE
收录类别	SCI
语种	英语
项目资助者	National Natural Science Foundation of China(30670307) ; Key Plan of International Cooperation Research in Sciences and Techniques(2002CB714006) ; Natural Science Foundation of Qinghai Province(2013-Z-915)
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000365020200016
引用统计	被引频次：1[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/363003/6522
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China 2.Sun Yat Sen Univ, Sch Life Sci, Guangzhou 510275, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Shi, Sheng-Bo,Shi, Rui,Li, Miao. Changes in photosynthesis of alpine plant Saussurea superba during leaf expansion[J]. ACTA PHYSIOLOGIAE PLANTARUM,2015,37(11).
APA	Shi, Sheng-Bo,Shi, Rui,&Li, Miao.(2015).Changes in photosynthesis of alpine plant Saussurea superba during leaf expansion.ACTA PHYSIOLOGIAE PLANTARUM,37(11).
MLA	Shi, Sheng-Bo,et al."Changes in photosynthesis of alpine plant Saussurea superba during leaf expansion".ACTA PHYSIOLOGIAE PLANTARUM 37.11(2015).

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