The role of UV-B radiation in the invasion of Hieracium pilosella-A comparison of German and New Zealand plants
The role of UV-B radiation in the invasion of Hieracium pilosella-A comparison of German and New Zealand plants
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DOI：
10.1016/j.envexpbot.2011.09.010
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发表时间：
2012-01-01
影响因子：
5.7
通讯作者：
Erfmeier, Alexandra
中科院分区：
文献类型：
--
作者：
Beckmann, Michael;Hock, Maria;Erfmeier, Alexandra
紫外线-B辐射的强度在北方和南半球之间不同。因此，来自北方半球的外来植物物种提供了一个机会，研究UV-B对植物生理和生长的影响，以及它们在南半球植物入侵过程中的适应作用和表型可塑性。它是侵入性的。我们检验了以下假设：（i）H. pilosella植物对UV-B的响应具有很高的表型可塑性，表明其对UV-B变化的反应能力，以及（ii）新西兰植物比德国植物更好地适应UV-B，这是定向选择适应良好的表型的结果。pilosella植物的可塑性反应，以产生较长的叶毛和较高的叶干物质含量（LDMC），当他们与UV-B处理，无论其来源。此外，不考虑处理，来自新西兰的植物显示出更高的LDMC，并且比德国植物生长更少但更长的叶。植物表现出典型的胁迫反应和UV-B处理引起的生长减少：地下生物量和分株生产减少时，植物与UV-B处理。H.我们的研究结果表明，在未来研究高UV-B辐射地区的入侵机制时，有必要考虑UV-B辐射。能够直接对UV-B作出反应的物种可能具有入侵这些地区的优势。由于臭氧层持续消耗，未来紫外线-B的强度可能会发生变化，因此研究植物入侵期间紫外线-B的影响越来越重要。(C)2011 Elsevier B. V.保留所有权利。
Intensity of ultraviolet-B radiation (UV-B)differs between northern and southern hemispheres. Therefore, exotic plants species that originate from the northern hemisphere provide an opportunity to study the effects of UV-B on plant physiology and growth, and their implications for the role of adaptation and phenotypic plasticity during plant invasion on the southern hemisphere.We conducted a growth-chamber experiment with and without UV-B on Hieracium pilosella plants from Germany, where the species occurs natively and New Zealand (NZ), where it is invasive. We tested the hypothesis that: (i) H. pilosella plants respond to UV-B with high phenotypic plasticity, demonstrating the ability to react to changes in UV-B, and (ii) NZ plants are better adapted to UV-B than German plants as a result of directional selection of well adapted phenotypes.Consistent with our first hypothesis H. pilosella plants reacted plastically to UV-B by producing longer foliar hairs and a higher leaf dry matter content (LDMC) when they were treated with UV-B regardless of their origin. Additionally, irrespective of the treatment, plants from NZ displayed a higher LDMC and grew less but longer leaves than German plants. Plants showed typical stress responses and a reduction in growth caused by the UV-B treatment: below-ground biomass and production of ramets were reduced when plants were treated with UV-B. H. pilosella proved to be particularly well predisposed to grow in areas of high UV-B radiation.Our findings hint at the necessity to consider UV-B radiation in future research on mechanisms of invasions in regions with high UV-B irradiation. Species that provide the ability to respond directly to UV-B might have an advantage to invade these areas. As UV-B intensity is likely to change in the future due to ongoing ozone depletion, research addressing the effects of UV-B during plant invasions is of increasing importance. (C) 2011 Elsevier B.V. All rights reserved.