Phenolics and condensed tannins of high altitude Pteridium arachnoideum in relation to sunlight exposure, elevation, and rain regime
Phenolics and condensed tannins of high altitude Pteridium arachnoideum in relation to sunlight exposure, elevation, and rain regime
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DOI：
10.1016/j.bse.2006.04.013
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发表时间：
2007-01-01
影响因子：
1.6
通讯作者：
Calcagno-Pisarelli, Maria Pia
中科院分区：
文献类型：
--
作者：
Alonso-Amelot, Miguel E.;Oliveros-Bastidas, Alberto;Calcagno-Pisarelli, Maria Pia
生长在高海拔地区的非适应植物，如蕨类植物蕨类植物，暴露在极端的环境中，可能会诱导化学适应反应。在此，我们发现生长在高海拔地区的蛛丝草叶片中低分子量(LMP)和高分子量(HMP)酚的分布是不均匀的。在干旱和雨季期间，在热带安第斯山脉2100-3190米的日照(E)和自遮荫(SS)羽片上测量了LMP-HMP的水平。在海拔2100m处，LMP的E和SS含量没有差异，但随着海拔的升高，E积累的LMP-HMP含量高于SS。这一差异在旱季期间增大。每片羽片相对于地面的位置与LMP-HMP在2570-3190m的样带上呈线性相关。旱季限水还导致了LMP和HMP的增加。我们的结论是，过量的UV-B辐射和水分可获得性是热带高山生境中非适应性植物对胁迫反应的重要模型。(C)2006爱思唯尔有限公司。保留所有权利。
Non-adapted plants growing in high altitude such as bracken fern Pteridium arachnoideum are exposed to environmental extremes that may induce a chemical adaptive response. Here we show that there is a non-uniform distribution of low (LMP) and high molecular weight (HMP) phenolics in the frond parts of P. arachnoideum growing at high elevation. LMP-HMP levels were measured in sun-exposed (E) and self shaded (SS) pinnae between 2100 and 3190 m in the tropical Andes, during dry and rainy seasons. While there was no difference in E vs. SS contents of LMP at 2100 m, E accumulated greater LMP-HMP concentrations relative to SS as altitude increased. This difference was increased during the dry season. Linear correlations between the position of each pinnae relative to the ground level and LMP-HMP occurred along a 2570-3190 m transect. Water restriction in the dry season also caused increase of LMP and HMP. We conclude that excess UV-B radiation and water availability are important modelers of the non-adapted plant acclimation response to stress in tropical high mountain habitats. (c) 2006 Elsevier Ltd. All rights reserved.