Impacts of Herbivory on Photosynthesis of Four Common Wisconsin Plant Species
Impacts of Herbivory on Photosynthesis of Four Common Wisconsin Plant Species
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DOI：
10.1674/0003-0031-187.1.14
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
N. Lemoine;M. Budny
中科院分区：
文献类型：
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作者：
N. Lemoine;M. Budny
抽象。对植食性的过度补偿在植物物种中普遍存在。然而，我们还没有完全理解为什么植物物种的补偿能力不同。过度补偿极有可能是由植物响应草食动物而提高光合作用的能力决定的，而草食动物则是由进化暴露于放牧所决定的。在这里，我们测试的假设，光合过度补偿应该是可预测的植物生命形式的基础上，通过模拟草食动物的损害四种植物：两种常见的范围草长期进化暴露于放牧（Andropogon gerardii，Bouteloua curtipendula）和两种常见的林下杂类草是耐，因此经验很少，放牧（Alliaria petiolata，Symplocarpus foetidus）。我们在整个生长季节的高分辨率时间序列中测量了叶片水平的气体交换。我们没有发现证据的光合补偿的四种植物中的三种。有趣的是，只有A。petiolata，一个高度入侵的物种，表现出增加光合作用和气孔导度后修剪。此外，影响是短暂的，因为光合作用和气孔导度在24小时内恢复到基线水平。我们的研究结果表明，光合作用的草食动物可能不是一个普遍的机制，植物抵抗或容忍草食动物。
Abstract. Overcompensation to herbivory is prevalent among plant species. However, we do not yet fully understand why plant species vary in their compensatory abilities. It is highly likely that overcompensation is determined by the ability of plants to elevate photosynthesis in response to herbivory, which is dictated by evolutionary exposure to grazing. Here, we tested the hypothesis that photosynthetic overcompensation should be predictable based on plant life form by simulating herbivore damage on four plant species: two common range grasses with long evolutionary exposure to grazing (Andropogon gerardii, Bouteloua curtipendula) and two common understory forbs that are resistant to, and therefore experience little, grazing (Alliaria petiolata, Symplocarpus foetidus). We measured leaf-level gas exchange in a high-resolution time series that extended throughout the growing season. We found no evidence of photosynthetic compensation for three of the four plant species. Interestingly, only A. petiolata, a highly invasive species, demonstrated increased photosynthesis and stomatal conductance following clipping. Further, the effects were short-lived, as both photosynthesis and stomatal conductance returned to baseline levels within 24 h. Our results suggest that elevated photosynthesis to herbivory might not be a general mechanism by which plants either resist or tolerate herbivory.