A Potassium-Dependent Oxygen Sensing Pathway Regulates Plant Root Hydraulics
A Potassium-Dependent Oxygen Sensing Pathway Regulates Plant Root Hydraulics
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DOI：
10.1016/j.cell.2016.08.068
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发表时间：
2016-09-22
期刊：
影响因子：
64.5
通讯作者：
Maurel, Christophe
中科院分区：
文献类型：
--
作者：
Shahzad, Zaigham;Canut, Matthieu;Maurel, Christophe
需氧生物通过激活不同的分子、代谢和生理反应在低氧（O-2）下生存。在大多数植物中，根透水性（换句话说，水力传导率，Lp（r））在O-2缺乏下下调。在这里，我们在拟南芥中使用了定量遗传学方法来克隆根1（HCR 1）的水力传导率，这是一种负控制Lp（r）的Raf-like MAPKKK。HCR 1积累，并在O-2限制和钾（K+）充足的情况下发挥作用。HCR 1通过控制核心厌氧反应的关键转录调节因子RAP 2.12来调节Lp（r）和缺氧反应基因。在拟南芥物种水平上观察到HCR 1在调节Lp（r）方面的实质性变化。因此，通过组合集成两个土壤信号，K+和O-2的可用性，HCR 1调制植物的弹性多个洪水的情况。
Aerobic organisms survive low oxygen (O-2) through activation of diverse molecular, metabolic, and physiological responses. In most plants, root water permeability (in other words, hydraulic conductivity, Lp(r)) is downregulated under O-2 deficiency. Here, we used a quantitative genetics approach in Arabidopsis to clone Hydraulic Conductivity of Root 1 (HCR1), a Raf-like MAPKKK that negatively controls Lp(r). HCR1 accumulates and is functional under combined O-2 limitation and potassium (K+) sufficiency. HCR1 regulates Lp(r) and hypoxia responsive genes, through the control of RAP2.12, a key transcriptional regulator of the core anaerobic response. A substantial variation of HCR1 in regulating Lp(r) is observed at the Arabidopsis species level. Thus, by combinatorially integrating two soil signals, K+ and O-2 availability, HCR1 modulates the resilience of plants to multiple flooding scenarios.