The PGPR strain Phyllobacterium brassicacearum STM196 induces a reproductive delay and physiological changes that result in improved drought tolerance in Arabidopsis
The PGPR strain Phyllobacterium brassicacearum STM196 induces a reproductive delay and physiological changes that result in improved drought tolerance in Arabidopsis
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DOI：
10.1111/nph.12383
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发表时间：
2013-10-01
期刊：
影响因子：
9.4
通讯作者：
Vile, Denis
中科院分区：
文献类型：
--
作者：
Bresson, Justine;Varoquaux, Fabrice;Vile, Denis
了解生物相互作用如何提高植物对干旱的耐受性是农学和生态学的一个具有挑战性的前景。促进植物生长的根瘤菌（PGPR）是很有前途的候选者，但PGPR在干旱条件下引起的表型变化仍有待阐明。研究了从油菜根际分离的一株芽孢杆菌（Phyllobacterium brassicacearum STM196）对不同开花时间拟南芥（Arabidopsis thaliana）的影响。我们测量了与植物生长发育相关的多种形态生理性状，以量化细菌在土壤条件下对拟南芥干旱响应策略的附加值。由细菌引起的生殖发育延迟导致生物量的增加，这与加入和浇水制度无关。接种植株蒸腾、ABA含量、光合作用和发育的协调变化导致植株水分利用效率提高，抗旱能力增强。我们的研究结果为PGPR赋予植物抗逆性的生态生理基础提供了新的见解。根际细菌诱导的开花时间延迟可能是提高生物量产量的一种有价值的策略，而根际细菌诱导的水利用改善在多种水可用性情况下具有特别的意义。
Understanding how biotic interactions can improve plant tolerance to drought is a challenging prospect for agronomy and ecology. Plant growth-promoting rhizobacteria (PGPR) are promising candidates but the phenotypic changes induced by PGPR under drought remain to be elucidated. We investigated the effects of Phyllobacterium brassicacearum STM196 strain, a PGPR isolated from the rhizosphere of oilseed rape, on two accessions of Arabidopsis thaliana with contrasting flowering time. We measured multiple morphophysiological traits related to plant growth and development in order to quantify the added value of the bacteria to drought-response strategies of Arabidopsis in soil conditions. A delay in reproductive development induced by the bacteria resulted in a gain of biomass that was independent of the accession and the watering regime. Coordinated changes in transpiration, ABA content, photosynthesis and development resulted in higher water-use efficiency and a better tolerance to drought of inoculated plants. Our findings give new insights into the ecophysiological bases by which PGPR can confer stress tolerance to plants. Rhizobacteria-induced delay in flowering time could represent a valuable strategy for increasing biomass yield, whereas rhizobacteria-induced improvement of water use is of particular interest in multiple scenarios of water availability.