Consequences of the overproduction of methyl jasmonate on seed production, tolerance to defoliation and competitive effect and response of Arabidopsis thaliana
Consequences of the overproduction of methyl jasmonate on seed production, tolerance to defoliation and competitive effect and response of Arabidopsis thaliana
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DOI：
10.1111/j.1469-8137.2006.01882.x
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发表时间：
2007-01-01
期刊：
影响因子：
9.4
通讯作者：
Cipollini, Don
中科院分区：
文献类型：
--
作者：
Cipollini, Don
植物在害虫攻击后茉莉酸甲酯（MeJA）的积累与防御的诱导有关，这些防御可以有益于适应性，但表达成本很高;在这里，我探讨了MeJA过表达对种子生产、对落叶的耐受性以及竞争效应和反应的影响，使用过表达茉莉酸羧基甲基转移酶（JMT）并含有比野生型植物高三倍水平的MeJA的拟南芥基因型。没有竞争，MAT植物产生的总种子质量比载体对照或野生型植物少37-40%，并且具有降低的种子萌发。落叶降低高度更强烈的野生型比JMT植物，但同样减少总种子产量。在竞争实验中，邻居的存在减少健身更强烈地在野生型比在JMT植物，但JMT植物表现出抑制的机会成本和利益的诱导与茉莉酸本身或其邻居。这可能与较高的组成型表达，但减少诱导茉莉酸介导的防御，包括胰蛋白酶抑制剂，表现出JMT plants.In自然植物种群，过表达的MeJA介导的反应应该是有益的，以抵抗草食动物，病原体和竞争对手，但直接昂贵的健身，并可能限制可塑性，在不断变化的环境条件。
Accumulation of methyl jasmonate (MeJA) after herbivore attack in plants is associated with the induction of defenses that can benefit fitness, but are costly to express; effects often explored using exogenous application of jasmonates.Here I explored the consequences of the overexpression of MeJA on seed production, tolerance to defoliation and competitive effect and response, using a genotype of Arabidopsis thaliana that overexpresses jasmonic acid carboxyl methyltransferase (JMT) and contains threefold higher levels of MeJA than wild-type plants.Without competition, MAT plants produced 37-40% less total seed mass than vector controls or wild-type plants, and had reduced seed germination. Defoliation reduced height more strongly in wild-type than in JMT plants, but reduced total seed production equally. In a competition experiment, the presence of a neighbor reduced fitness more strongly in wild-type than in JMT plants, but JMT plants exhibited dampened opportunity costs and benefits of induction with jasmonic acid of itself or its neighbor. This may have related to the higher constitutive expression but reduced inducibility of jasmonate-mediated defenses, including trypsin inhibitors, exhibited by JMT plants.In natural plant populations, overexpression of MeJA-mediated responses should be beneficial to resistance to herbivores, pathogens and competitors, but is directly costly to fitness and probably constrains plasticity in response to changing environmental conditions.