Contrasting altitudinal patterns of leaf UV reflectance and absorbance in four herbaceous species on the Qinghai–Tibetan Plateau
Contrasting altitudinal patterns of leaf UV reflectance and absorbance in four herbaceous species on the Qinghai–Tibetan Plateau
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青藏高原四种草本植物叶片紫外反射率和吸收率的海拔格局对比
DOI：
10.1093/jpe/rty016
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发表时间：
2019-03
影响因子：
2.7
通讯作者：
唐艳鸿
中科院分区：
文献类型：
--
作者：
李欣;柯心然;周华坤;唐艳鸿
AIM SAS ALPINE植物必须应对强烈的紫外线（UV）辐射及其海拔变化。有人认为，叶紫外线反射率和吸光度应该在适应和适应紫外线变化的核心作用，但
Aims Alpine plants have to cope with intense ultraviolet (UV) radiation and its altitudinal changes. It has been argued that leaf UV reflectance and absorbance should play a central role in acclimation and adaptation to changes in UV radiation, but evidence is limited from high altitudinal ecosystems. In this study, we assessed whether leaf UV reflectance and leaf pigments jointly vary with altitude in alpine broadleaved herbaceous species. The primary hypothesis is that leaves with higher UV reflectance should have lower UV absorbance and/or lower contents of photosynthetic pigments. Methods Leaf UV reflectance, leaf UV absorbance and photosynthetic pigments (chlorophyll a and b, carotenoids) were examined in four broadleaved herbaceous species in relation to their habitat altitudes. The leaf surface reflectance and leaf extract absorbance at wavelengths of 305 and 360 nm were measured to examine the leaf optical and photochemical characteristics in the UV-B and UV-A bands, respectively. The species included Saussurea katochaete Maxim., Saussurea pulchra Lipsch., Anaphalis lactea Maxim. and Rheum pumilum Maxim., which are distributed along the same slope from 3 200 to 4 200 m in the Qilian Mountains, Qinghai–Tibetan Plateau. Important Findings The leaf UV absorbance was approximately twice as high at 305 nm (UV-B) than at 360 nm (UV-A) for all species except R. pumilum. Among the four species, the leaf UV absorbance was the highest and almost all values were within 2–6 Abs cm−2 (absorbance cm−2) in S. pulchra, but the lowest (frequently <1 Abs cm−2) were observed in R. pumilum. Only R. pumilum showed significantly higher values at higher elevations. Leaf UV reflectance was generally higher at higher elevations for all species except for A. lactea, and exhibited much larger altitudinal variations compared to leaf UV absorbance. Anaphalis lactea showed a very high UV reflectance even at low altitudes. Among the four species, photosynthetic pigments tended to decrease with an increase in leaf UV reflectance but increased with leaf UV absorbance. The study suggests that leaf UV reflectance, rather than leaf UV absorbance, plays a more active role in acclimation to altitudinal changes in UV radiation, and a high investment in leaf UV reflectance may limit the accumulation of photosynthetic pigments in alpine plants.
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DOI：
10.1002/9781119143611.ch12
发表时间：
2017-02
期刊：
--
影响因子：
--
作者：
S. Gupta;Marisha Sharma;F. Deeba;V. Pandey
通讯作者：
S. Gupta;Marisha Sharma;F. Deeba;V. Pandey
影响因子：
1.7
作者：
J. Rozema;A. Chardonnens;M. Tosserams;R. Hafkenscheid;S. Bruijnzeel
通讯作者：
J. Rozema;A. Chardonnens;M. Tosserams;R. Hafkenscheid;S. Bruijnzeel
影响因子：
2.7
作者：
R. Robberecht;M. Caldwell
通讯作者：
R. Robberecht;M. Caldwell
影响因子：
6.5
作者：
Barnes, Paul W.;Flint, Stephan D.;Wargent, Jason J.
通讯作者：
Wargent, Jason J.
影响因子：
6.5
作者：
Bernal, M.;Llorens, L.;Verdaguer, D.
通讯作者：
Verdaguer, D.