High CO2 Primes Plant Biotic Stress Defences through Redox-Linked Pathways
High CO2 Primes Plant Biotic Stress Defences through Redox-Linked Pathways
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DOI：
10.1104/pp.16.01129
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发表时间：
2016-10-01
期刊：
影响因子：
7.4
通讯作者：
Noctor, Graham
中科院分区：
文献类型：
--
作者：
Mhamdi, Amna;Noctor, Graham
过去两个世纪里，工业活动导致对流层二氧化碳浓度增加，预计这一趋势至少将持续几十年。在这里，我们报告说，植物在富含二氧化碳的环境中生长会激活对于防御病原体攻击至关重要的反应。拟南芥（Arabidopsis thaliana）和菜豆（Phaseolus vulgaris）等其他植物中高生长的二氧化碳引发了水杨酸的积累。对拟南芥的详细分析表明，二氧化碳浓度升高会启动多种防御途径，从而增强对细菌和真菌挑战的抵抗力。对基因特异性突变体的分析没有提供证据表明高二氧化碳激活植物防御途径是由气孔关闭引起的。相反，这种激活部分与涉及氧化还原信号传导的代谢效应有关。为了支持这一点，氧化还原成分（谷胱甘肽含量和 NADPH 生成酶）的基因改造可防止水杨酸途径的完全启动以及高 CO2 引起的相关抵抗。数据表明，非磷酸化甘油醛-3-磷酸脱氢酶具有特别重要的作用，这种胞质酶在植物中的作用尚不清楚。我们的观察增加了关于高二氧化碳和氧化信号之间关系的新信息，并为高二氧化碳条件下植物的应激反应提供了新的见解。
Industrial activities have caused tropospheric CO2 concentrations to increase over the last two centuries, a trend that is predicted to continue for at least the next several decades. Here, we report that growth of plants in a CO2-enriched environment activates responses that are central to defense against pathogenic attack. Salicylic acid accumulation was triggered by high-growth CO2 in Arabidopsis (Arabidopsis thaliana) and other plants such as bean (Phaseolus vulgaris). A detailed analysis in Arabidopsis revealed that elevated CO2 primes multiple defense pathways, leading to increased resistance to bacterial and fungal challenge. Analysis of gene-specific mutants provided no evidence that activation of plant defense pathways by high CO2 was caused by stomatal closure. Rather, the activation is partly linked to metabolic effects involving redox signaling. In support of this, genetic modification of redox components (glutathione contents and NADPH-generating enzymes) prevents full priming of the salicylic acid pathway and associated resistance by high CO2. The data point to a particularly influential role for the nonphosphorylating glyceraldehyde-3-phosphate dehydrogenase, a cytosolic enzyme whose role in plants remains unclear. Our observations add new information on relationships between high CO2 and oxidative signaling and provide novel insight into plant stress responses in conditions of increased CO2.