UV radiation is the primary factor driving the variation in leaf phenolics across Chinese grasslands.
UV radiation is the primary factor driving the variation in leaf phenolics across Chinese grasslands.
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DOI：
10.1002/ece3.862
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发表时间：
2013-11
影响因子：
2.6
通讯作者：
He JS
中科院分区：
文献类型：
--
作者：
Chen L;Niu K;Wu Y;Geng Y;Mi Z;Flynn DF;He JS
由于作用叶酚防御紫外线B（UVB）在以前控制的条件下，我们假设，紫外线辐射（UVR）可能是一个主要因素驱动的变化在植物叶酚在一个大的地理范围。我们测量了叶总酚，紫外线吸收化合物（UVAC），和相应的叶氮，磷，比叶面积（SLA）在151个常见的物种。这些物种来自中国青藏高原和内蒙古草原的84个地点，UVR（平均354对161 mW/cm 2）。总体而言，叶片酚类物质和紫外线乙酸都显着高于在西藏高原比在内蒙古草原，独立的物种之间的系统发育关系。回归分析表明，叶酚类物质的变化强烈影响气候因素，特别是紫外线辐射，和土壤属性在所有网站。结构方程模型（SEM）确定的主要作用，紫外线辐射在确定叶酚类物质的浓度，占colinearities与海拔高度，气候和土壤因素后。此外，酚类物质与UVAC和SLA呈正相关，与叶片N和N：P呈负相关。这些关系在低海拔内蒙古比在青藏高原草原更陡峭。我们的数据支持，叶片酚类化合物的变化主要是由紫外辐射控制，这意味着高的叶片酚类化合物通过其紫外屏蔽和/或抗氧化功能，促进植物适应强辐射，特别是在青藏高原。重要的是，我们的研究结果还表明，叶酚类物质可能会影响植被属性，并通过与叶功能性状的协变间接影响生态系统过程。
Due to the role leaf phenolics in defending against ultraviolet B (UVB) under previously controlled conditions, we hypothesize that ultraviolet radiation (UVR) could be a primary factor driving the variation in leaf phenolics in plants over a large geographic scale. We measured leaf total phenolics, ultraviolet-absorbing compounds (UVAC), and corresponding leaf N, P, and specific leaf area (SLA) in 151 common species. These species were from 84 sites across the Tibetan Plateau and Inner Mongolian grasslands of China with contrasting UVR (354 vs. 161 mW/cm2 on average). Overall, leaf phenolics and UVAC were all significantly higher on the Tibetan Plateau than in the Inner Mongolian grasslands, independent of phylogenetic relationships between species. Regression analyses showed that the variation in leaf phenolics was strongly affected by climatic factors, particularly UVR, and soil attributes across all sites. Structural equation modeling (SEM) identified the primary role of UVR in determining leaf phenolic concentrations, after accounting for colinearities with altitude, climatic, and edaphic factors. In addition, phenolics correlated positively with UVAC and SLA, and negatively with leaf N and N: P. These relationships were steeper in the lower-elevation Inner Mongolian than on the Tibetan Plateau grasslands. Our data support that the variation in leaf phenolics is controlled mainly by UV radiation, implying high leaf phenolics facilitates the adaptation of plants to strong irradiation via its UV-screening and/or antioxidation functions, particularly on the Tibetan Plateau. Importantly, our results also suggest that leaf phenolics may influence on vegetation attributes and indirectly affect ecosystem processes by covarying with leaf functional traits.
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影响因子：
10.1
作者：
Keesing, F
通讯作者：
Keesing, F
DOI：
10.1073/pnas.0802368105
发表时间：
2008-07-22
影响因子：
11.1
作者：
Agrawal, Anurag A.;Fishbein, Mark
通讯作者：
Fishbein, Mark
影响因子：
3.4
作者：
Close, DC;McArthur, C
通讯作者：
McArthur, C
影响因子：
9.4
作者：
He, JS;Wang, ZH;Fang, JY
通讯作者：
Fang, JY
影响因子：
4.3
作者：
Agati, Giovanni;Biricolti, Stefano;Tattini, Massimiliano
通讯作者：
Tattini, Massimiliano