Mechanical leaf damage causes localized, but not systemic, changes in leaf movement behavior of the Sensitive Plant, Mimosa pudica (Fabaceae) L.
Mechanical leaf damage causes localized, but not systemic, changes in leaf movement behavior of the Sensitive Plant, Mimosa pudica (Fabaceae) L.
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DOI：
10.1139/cjb-2012-0131
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发表时间：
2013-01-01
期刊：
影响因子：
--
通讯作者：
Kolenosky, Carina
中科院分区：
文献类型：
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作者：
Cahill, James F., Jr.;Bao, Tan;Kolenosky, Carina
少数物种，包括含羞草，使用快速叶片运动作为一种假定的防御策略。基于运动的防御系统如何响应机械损伤而改变，以及这些变化是局部的还是系统性的尚不清楚。这与描述机械性叶片损伤如何在多种植物物种内引起形态学和化学反应的大量文献相反。根据物种和刺激，这些化学和形态学反应可以定位于受损的组织或系统性地遍及植物体。在这里，我们报告了一个小型实验的结果，旨在测试以下内容：（i）机械叶片损伤是否影响随后的叶片关闭行为，以及（ii）变化是否是系统性的或局部的。为了做到这一点，我们使用行为测定法（在随后的触摸刺激之后重新打开叶子的时间）对机械损伤之前和之后的几天的叶子进行评分。在受损和未受损的植物上观察受损叶片上方和下方的叶片，使我们能够评估任何变化是否是系统性的。我们发现叶片损伤引起强烈的局部效应，大大增加了时间重新开放的损坏，但不是相邻的，叶。这种行为转变的生理原因和健康后果都不清楚。有趣的是，这种改变的行为导致受损的叶子比未受损的叶子保持“隐藏”的时间更长。如果叶片关闭减少了草食动物的风险，可能有适应价值，类似于诱导化学和形态防御。
A small number of species, including Mimosa pudica, use rapid leaf movement as a presumptive defensive strategy. How movement-based defenses change in response to mechanical damage and whether changes are localized or systemic is unknown. This is in contrast to a substantial literature describing how mechanical leaf damage can cause morphological and chemical responses within a diversity of plant species. Depending on the species and the stimuli, these chemical and morphological responses can be localized to the tissues damaged or systemic throughout the plant body. Here we report the results of a small experiment designed to test the following: (i) whether mechanical leaf damage influences subsequent leaf closure behavior, and (ii) whether changes were systemic or localized. To do this, we scored leaves using a behavioral assay (time-to-reopen leaves following a subsequent touch stimuli) for several days before and following mechanical damage. Leaves above and below the damaged leaf were observed, on damaged and undamaged plants, allowing us to assess whether any change was systemic. We found leaf damage caused strong localized effects, greatly increasing the time-to-reopen of the damaged, but not adjacent, leaves. Neither the physiological cause nor fitness consequences of this behavioral shift are known. Interestingly, this altered behavior resulted in damaged leaves remaining "hidden" longer than undamaged leaves. If leaf closure reduces risk of herbivory, there could be adaptive value, analogous to inducible chemical and morphological defenses.