Balancing trade-offs between biotic and abiotic stress responses through leaf age-dependent variation in stress hormone cross-talk
Balancing trade-offs between biotic and abiotic stress responses through leaf age-dependent variation in stress hormone cross-talk
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DOI：
10.1073/pnas.1817233116
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发表时间：
2019-02-05
影响因子：
11.1
通讯作者：
Tsuda, Kenichi
中科院分区：
文献类型：
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作者：
Berens, Matthias L.;Wolinska, Katarzyna W.;Tsuda, Kenichi
在自然界中，植物必须同时对多种压力做出反应，这可能需要压力反应途径之间的串扰，以最大限度地减少适应成本。在这里，我们提供的遗传证据表明，生物和非生物胁迫反应的差异优先在不同年龄的拟南芥叶片，以维持生物和非生物胁迫下的生长和繁殖。非生物胁迫，如高盐度和干旱，钝化的免疫反应，在老莲座叶通过植物激素脱落酸信号，而这种拮抗作用被阻断在年轻的莲座叶PBS3，防御植物激素水杨酸的信号成分。植物缺乏PBS3表现出增强的非生物胁迫的耐受性，在生物和非生物胁迫下，以降低适合度为代价。与此同时，PBS3也是建立盐胁迫和叶龄依赖性叶际细菌群落所不可或缺的。总的来说，我们的工作揭示了一种机制，在生物体水平上平衡冲突压力的权衡，并确定了植物免疫力，叶微生物群和非生物胁迫耐受性之间的遗传交叉点。
In nature, plants must respond to multiple stresses simultaneously, which likely demands cross-talk between stress-response pathways to minimize fitness costs. Here we provide genetic evidence that biotic and abiotic stress responses are differentially prioritized in Arabidopsis thaliana leaves of different ages to maintain growth and reproduction under combined biotic and abiotic stresses. Abiotic stresses, such as high salinity and drought, blunted immune responses in older rosette leaves through the phytohormone abscisic acid signaling, whereas this antagonistic effect was blocked in younger rosette leaves by PBS3, a signaling component of the defense phytohormone salicylic acid. Plants lacking PBS3 exhibited enhanced abiotic stress tolerance at the cost of decreased fitness under combined biotic and abiotic stresses. Together with this role, PBS3 is also indispensable for the establishment of salt stress-and leaf age-dependent phyllosphere bacterial communities. Collectively, our work reveals a mechanism that balances trade-offs upon conflicting stresses at the organism level and identifies a genetic intersection among plant immunity, leaf microbiota, and abiotic stress tolerance.