Vernalization attenuates dehydration tolerance in winter-annual Arabidopsis
Vernalization attenuates dehydration tolerance in winter-annual Arabidopsis
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春化作用减弱了冬季一年生拟南芥的脱水耐受性
DOI：
10.1093/plphys/kiac264
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Yong Ding
中科院分区：
文献类型：
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作者：
Lan Chen;Pengcheng Hu;Qianqian Lu;Fei Zhang;Yanhua Su;Yong Ding
在冬季一年生植物中，暴露于寒冷的温度诱导耐寒性，并在次年春天加速开花。然而，很少有人知道植物适应脱水胁迫后，冬季。在这里，我们发现，脱水耐受性降低冬一年生拟南芥（拟南芥）春化后。冬性一年生拟南芥FRI植株表现出较高的脱水耐性，气孔开度小，对外源脱落酸敏感。FRI植株的耐脱水性和FLC基因转录水平随着冷暴露时间的延长而逐渐降低。FLC直接结合到OPEN STOMATA 1（OST 1）的启动子并激活OST 1的表达。FLC功能的丧失导致脱水耐受性降低和OST 1转录水平降低。FLC和OST 1在相同的脱水胁迫途径中起作用，OST 1在FLC下游起作用。我们的研究提供了FRI通过FLC-OST 1模块调节脱水耐受性的机制的见解。我们的研究结果表明，冬一年生拟南芥整合脱水耐受性和开花时间，以适应从冬季到春季的环境变化。
In winter-annual plants, exposure to cold temperatures induces cold tolerance and accelerates flowering in the following spring. However, little is known about plant adaptations to dehydration stress after winter. Here, we found that dehydration tolerance is reduced in winter-annual Arabidopsis (Arabidopsis thaliana) after vernalization. Winter-annual Arabidopsis plants with functional FRIGIDA (FRI) exhibited high dehydration tolerance, with small stomatal apertures and hypersensitivity to exogenous abscisic acid. Dehydration tolerance and FLOWERING LOCUS C (FLC) transcript levels gradually decreased with prolonged cold exposure in FRI plants. FLC directly bound to the promoter of OPEN STOMATA1 (OST1) and activated OST1 expression. Loss of FLC function resulted in decreased dehydration tolerance and reduced OST1 transcript levels. FLC and OST1 act in the same dehydration stress pathway, with OST1 acting downstream of FLC. Our study provides insights into the mechanisms by which FRI modulates dehydration tolerance through the FLC-OST1 module. Our results suggest that winter-annual Arabidopsis integrates dehydration tolerance and flowering time to adapt to environmental changes from winter to spring.