Diurnal and circadian regulation of salt tolerance in Arabidopsis
Diurnal and circadian regulation of salt tolerance in Arabidopsis
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DOI：
10.1007/s12374-016-0317-8
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发表时间：
2016-12-01
影响因子：
2.9
通讯作者：
Yun, Dae-Jin
中科院分区：
文献类型：
--
作者：
Park, Hee Jin;Qiang, Zhang;Yun, Dae-Jin
大多数生物体都有一个生物钟，它可以协调内部生物事件与外部环境信号。最近的研究表明，拟南芥生物钟调节植物对干旱、寒冷、病原体和创伤等逆境的反应。然而，生物钟和植物对盐的反应之间的联系尚未得到研究，盐会阻碍植物生长并降低作物产量。在这项研究中，我们表明，耐盐胁迫的拟南芥昼夜周期调节。盐诱导的盐和干旱响应转录因子基因RD 29 A的表达依赖于一天中的时间，Na+/H+逆向转运蛋白基因SOS 1的转录受生物钟的控制。此外，在组成型过表达SOS 1（SOS 1 ox）的转基因植物中，盐胁迫后SOS 1蛋白的积累似乎发生在昼夜循环中。这些研究结果表明，在盐胁迫响应过程中，RD 29 A和SOS 1的表达受昼夜周期和生物钟的调节，这使得植物能够有效地预测和响应白天蒸腾引发的脱水，干旱和盐胁迫。
Most living organisms have a circadian clock, which coordinates their internal biological events with external environmental signals. Recent work showed that the Arabidopsis circadian clock regulates the plant's responses to stresses such as drought, cold, pathogens, and wounding. However, the link between the circadian clock and the plant's response to salinity, which retards plant growth and reduces crop yields, has not yet been investigated. In this study, we showed that tolerance to salinity stress is regulated by the diurnal cycle in Arabidopsis. The salt-induced expression of the salt- and drought-responsive transcription factor gene RD29A depends on the time of day and the transcription of the Na+/H+ antiporter gene SOS1 is under the control of the circadian clock. Furthermore, accumulation of SOS1 protein upon salt stress in transgenic plants that constitutively overexpress SOS1 (SOS1ox) appears to occur in a diurnal cycle. These findings suggest that during the salinity stress response, the expression of RD29A and SOS1 is modulated by diurnal cycles and the circadian clock, which allows the plant to anticipate and respond effectively to daytime transpiration-triggered dehydration, drought, and salinity stress.