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首页> 外文期刊>The New Phytologist >Nicotiana attenuata MPK4 suppresses a novel jasmonic acid (JA)signaling-independent defense pathway against the specialistinsect Manduca sexta, but is not required for the resistance tothe generalist Spodoptera littoralis
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Nicotiana attenuata MPK4 suppresses a novel jasmonic acid (JA)signaling-independent defense pathway against the specialistinsect Manduca sexta, but is not required for the resistance tothe generalist Spodoptera littoralis

机译：弱毒烟草MPK4抑制了针对茉莉专性昆虫的新的茉莉酸（JA）信号独立防御途径，但对于抗性全面的斜纹夜蛾不需要

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How plants tailor their defense responses to attack from different insects remains largelyunknown. Here, we studied the role of a mitogen-activated protein kinase (MAPK), MPK4, inthe resistance of a wild tobacco Nicotiana attenuata to two herbivores, the specialistManduca sexta and the generalist Spodoptera littoralis. Stably transformed N. attenuata plants silenced in MPK4 (irMPK4) were generated andcharacterized for traits important for defense against herbivores. Only the oral secretions (OS) from M. sexta, but not the OS from S. littoralis or mechanicalwounding, induced elevated levels of jasmonic acid (JA) in irMPK4 plants relative to the wildtypeplants. Moreover, silencing of MPK4 strongly increased the resistance of N. attenuata toM. sexta in a fashion that was independent of COI1 (CORONATINE INSENSITIVE1)-mediatedJA signaling. Untargeted metabolomic screening identified several new MPK4-dependentputative defensive compounds against M. sexta. By contrast, silencing of MPK4 did notaffect the growth of the generalist insect S. littoralis, and we propose that this was because ofthe very low levels of fatty acid–amino acid conjugates (FACs) in S. littoralis OS. Thus, MPK4 is likely to be a key signaling element that enables plants to tailor defenseresponses to different attackers.
机译：植物如何调整防御反应以抵御来自不同昆虫的攻击仍然是未知的。在这里，我们研究了有丝分裂原激活的蛋白激酶（MAPK）MPK4在野生烟草弱毒烟草对两种食草动物，即曼杜卡六性uca虫和通才Spodoptera littoralis的抗性中的作用。产生并转化了在MPK4（irMPK4）中沉默的稳定转化的弱毒猪笼草植物，并表征了对防御食草动物具有重要作用的性状。相对于野生型植物，只有六分枝杆菌的口腔分泌物（OS），而不是沿海链球菌或机械伤口的OS诱导茉莉酸（JA）水平升高。此外，MPK4沉默大大增加了减毒猪笼草对M的抗性。以独立于COI1（CORONATINE INSENSITIVE1）介导的JA信号传导的方式进行六分体。非靶向代谢组学筛选确定了几种新的依赖MPK4的对抗性支原体的防御性化合物。相比之下，MPK4沉默不影响普通昆虫沿海链球菌的生长，我们认为这是因为沿海链球菌OS中的脂肪酸-氨基酸共轭物（FAC）含量非常低。因此，MPK4可能是使植物能够针对不同攻击者调整防御反应的关键信号元件。

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