Adaptation to chronic drought modifies soil microbial community responses to phytohormones.
Adaptation to chronic drought modifies soil microbial community responses to phytohormones.
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对慢性干旱的适应改变了土壤微生物群落对植物激素的反应。
DOI：
10.1038/s42003-021-02037-w
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发表时间：
2021-05-03
影响因子：
5.9
通讯作者：
Dodd IC
中科院分区：
文献类型：
--
作者：
Sayer EJ;Crawford JA;Edgerley J;Askew AP;Hahn CZ;Whitlock R;Dodd IC
干旱对植物和相关的土壤微生物施加压力，诱导协调的适应性反应，这可能涉及植物-土壤信号通过植物激素。然而，我们对微生物群落如何对植物激素做出反应，或者这些反应如何受到慢性（长期）干旱的影响知之甚少。在这里，我们添加了三种植物激素（脱落酸，1-aminocyclopropane-1-carboxylic acid，和茉莉酸），从长期（25年），实地气候处理的土壤，以测试的假设，慢性干旱改变土壤微生物群落对植物胁迫信号的反应。植物激素增加土壤呼吸，但这种影响是强于灌溉比干旱土壤和增加土壤呼吸在低浓度的植物激素不能解释其作为基板使用。因此，我们表明，干旱适应土壤微生物群落内修改其响应植物激素输入。此外，干旱与灌溉土壤中微生物功能群的不同植物激素诱导的变化可能表明，干旱适应的土壤微生物将植物激素视为压力信号，使它们能够预测即将到来的干旱。Emma Sayer等人使用了一个25年的田间试验来研究干旱如何影响微生物群落对植物激素的反应。植物胁迫诱导的微生物功能群的变化表明，土壤微生物群落内的干旱适应介导了植物胁迫信号的响应。
Drought imposes stress on plants and associated soil microbes, inducing coordinated adaptive responses, which can involve plant–soil signalling via phytohormones. However, we know little about how microbial communities respond to phytohormones, or how these responses are shaped by chronic (long-term) drought. Here, we added three phytohormones (abscisic acid, 1-aminocyclopropane-1-carboxylic acid, and jasmonic acid) to soils from long-term (25-year), field-based climate treatments to test the hypothesis that chronic drought alters soil microbial community responses to plant stress signalling. Phytohormone addition increased soil respiration, but this effect was stronger in irrigated than in droughted soils and increased soil respiration at low phytohormone concentrations could not be explained by their use as substrate. Thus, we show that drought adaptation within soil microbial communities modifies their responses to phytohormone inputs. Furthermore, distinct phytohormone-induced shifts in microbial functional groups in droughted vs. irrigated soils might suggest that drought-adapted soil microorganisms perceive phytohormones as stress-signals, allowing them to anticipate impending drought. Emma Sayer et al. use a 25-year field experiment to investigate how microbial community responses to phytohormones are affected by drought. Phytohormone-induced shifts in microbial functional groups suggest that drought adaptation within soil microbial communities mediates responses to plant stress signalling.
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