The specificity of eavesdropping on sagebrush by other plants
The specificity of eavesdropping on sagebrush by other plants
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DOI：
10.1890/03-0593
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发表时间：
2004-07-01
期刊：
影响因子：
4.8
通讯作者：
McCall, AC
中科院分区：
文献类型：
--
作者：
Karban, R;Huntzinger, M;McCall, AC
在实验修剪的山艾树附近种植的野生烟草比在未修剪的山艾树附近种植的烟草对食草动物的抗性更强。在这里，我们询问窃听山艾树是否是一种普遍现象。另外三种生长在山艾树附近的草本植物，当它们的山艾树邻居在实验中被剪断时，它们的食草性会减少吗？同样地，我们问当同地域的邻居被修剪时，山艾树是否会变得更有抵抗力。我们发现，对骆马、羽扇豆和缬草叶片的损害程度不受邻近山艾树的实验修剪的影响。这三种草本植物与山艾树有许多共同的食草动物，野生烟草也是如此。与未修剪邻居的植物相比，修剪邻居附近的山艾树个体在夏季被食草动物吃掉的叶子损失约为一半。大多数食草动物是由多面手蚱蜢和哺乳动物引起的。一种专门捕食山艾树的金合体甲虫的成功不受修剪邻近山艾树的影响。这些结果表明，山艾树与烟草之间的交流并不是一种独特的现象，因为山艾树在邻居被修剪时也会做出反应。相比之下，其他植物物种对线索的反应通常不如烟草强烈，这表明并非所有物种都对环境中相对高水平的茉莉酸盐有反应。窃听可能仅限于那些具有强诱导性的物种，比如烟草，以及那些释放高浓度线索的物种，比如山艾树。
Wild tobacco growing in a field near experimentally clipped sagebrush became more resistant to herbivores than tobacco plants near unclipped sagebrush. Here, we asked whether eavesdropping on sagebrush is a common phenomenon. Do three other forb species that grow near sagebrush experience less herbivory when their sagebrush neighbors are clipped experimentally? Similarly, we asked if sagebrush becomes more resistant when conspecific neighbors are clipped. We found that levels of damage to leaves of lomatium, lupine, and valerian were unaffected by experimental clipping of neighboring sagebrush. These three forbs share many generalist herbivores with sagebrush, as does wild tobacco. Sagebrush individuals near clipped neighbors experienced approximately half the leaf loss to herbivores over the summer as plants with unclipped neighbors. Most of this herbivory was caused by generalist grasshoppers and mammals. Success of a chrysomelid beetle that specializes on sagebrush was unaffected by clipping neighboring sagebrush. These results indicate that communication between sagebrush and tobacco is not a unique phenomenon since sagebrush also responded when neighbors were clipped. In contrast, other plant species generally respond less strongly to cues than does tobacco, indicating that not all species respond to relatively high levels of jasmonate in their environments. Eavesdropping may be restricted to those species, like tobacco, that are strongly inducible and to those species, like sagebrush, that release high concentrations of cues.