Jasmonate-induced responses are costly but benefit plants under attack in native populations
Jasmonate-induced responses are costly but benefit plants under attack in native populations
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DOI：
10.1073/pnas.95.14.8113
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发表时间：
1998-07-07
影响因子：
11.1
通讯作者：
Baldwin, IT
中科院分区：
文献类型：
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作者：
Baldwin, IT
众所周知，食草动物的攻击会降低食物质量，增加化学防御和其他负责食草动物抗性的性状。诱导防御通常被认为允许植物在不需要时放弃防御的成本;然而，它们的防御功能（增加植物的适应性）和它们的成本节约功能都没有在自然界中得到证明。根产生的毒素尼古丁增加后，草食动物的攻击，在本地，火灾后一年生烟草衰减，是由内部激活的伤口激素，茉莉酸，我处理的植物根与甲基酯的这种激素（MeJA）引起的反应，在每一个成员的745对匹配的植物生长在本地人口与不同的攻击可能性，从草食动物，并测量了活种子的寿命生产。在群体中的攻击率中等，诱导植物的草食动物攻击较少，并存活下来，以产生更多的种子比他们的未诱导的同行，以前的诱导没有显着增加的健身植物遭受高利率的攻击。然而，如果植物没有受到攻击，诱导植物产生的种子比他们的未诱导的同行。茉莉酸诱导的反应具有防御功能，但代价高昂，而诱导性反应允许这种物种在防御不必要时放弃这些代价。
Herbivore attack is widely known to reduce food quality and to increase chemical defenses and other traits responsible for herbivore resistance. Inducible defenses are commonly thought to allow plants to forgo the costs of defense when not needed; however, neither their defensive function (increasing a plant's fitness) nor their cost-savings function have been demonstrated in nature. The root-produced toxin nicotine increases after herbivore attack in the native, postfire annual Nicotiana attenuata and is internally activated by the wound hormone, jasmonic acid, I treated the roots of plants with the methyl ester of this hormone (MeJA) to elicit a response in one member of each of 745 matched pairs of plants growing in native populations with different probabilities of attack from herbivores, and measured the lifetime production of viable seed. In populations with intermediate rates of attack, induced plants were attacked less often by herbivores and survived to produce more seed than did their uninduced counterparts, Previous induction did not significantly increase the fitness of plants suffering high rates of attack. However, if plants had not been attacked, induced plants produced less seed than did their uninduced counterparts. Jasmonate-induced responses function as defenses but are costly, and inducibility allows this species to forgo these costs when the defenses are unnecessary.