Elevated atmospheric CO2 differentially affects tobacco and rice defense against lepidopteran larvae via the jasmonic acid signaling pathway
Elevated atmospheric CO2 differentially affects tobacco and rice defense against lepidopteran larvae via the jasmonic acid signaling pathway
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大气中二氧化碳含量升高通过茉莉酸信号通路对烟草和水稻对鳞翅目幼虫的防御产生不同影响
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发表时间：
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影响因子：
11.4
通讯作者：
Jianqianig Wu
中科院分区：
文献类型：
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作者：
Chengkai Lu;Jinfeng Qi;Jianqianig Wu
由于人类活动，大气中的二氧化碳含量正在迅速增加。然而，CO2浓度升高（ECO2）对植物防御昆虫的影响及其机制仍然知之甚少。在这里，我们表明，ECO2增加了光合速率和生物量的烟草和水稻植物，和咀嚼鳞翅目昆虫斜纹夜蛾和粘虫分离烟草和水稻植物，获得越来越多的质量，分别。因此，在ECO2胁迫下，烟草和水稻植株中控制植物对鳞翅目昆虫防御的主要激素茉莉酸（JA）及其主要防御相关代谢产物的含量有升高和降低的趋势。重要的是，JA生物合成和感知沉默的烟草和水稻中防御相关代谢物的生物测定和定量表明，ECO2主要通过影响JA途径来改变植物抗性。我们进一步证明，防御代谢产物，而不是总氮或蛋白质，是主要因素，有助于改变防御水平下ECO2。这项研究表明，ECO2改变了植物和昆虫之间的相互作用，我们建议，作物应研究其对主要害虫在ECO2下的抗性，以预测ECO2对未来农业生态系统的影响。
Atmospheric CO2 levels are rapidly increasing due to human activities. However, the effects of elevated CO2 (ECO2) on plant defense against insects and the underlying mechanisms remain poorly understood. Here we show that ECO2 increased the photosynthetic rates and the biomass of tobacco and rice plants, and the chewing lepidopteran insects Spodoptera litura and Mythimna separata gained less and more mass on tobacco and rice plants, respectively. Consistently, under ECO2, the levels of jasmonic acid (JA), the main phytohormone controlling plant defense against these lepidopteran insects, as well as the main defense-related metabolites, were increased and decreased in insect-damaged tobacco and rice plants. Importantly, bioassays and quantification of defense-related metabolites in tobacco and rice silenced in JA biosynthesis and perception indicate that ECO2 changes plant resistance mainly by affecting the JA pathway. We further demonstrate that the defensive metabolites, but not total N or protein, are the main factor contributing to the altered defense levels under ECO2. This study illustrates that ECO2 changes the interplay between plants and insects, and we propose that crops should be studied for their resistance to the major pests under ECO2 to predict the impact of ECO2 on future agroecosystems.