A dual function of SnRK2 kinases in the regulation of SnRK1 and plant growth

编号 040026505

推送时间 20201116

研究领域 森林培育 

年份 2020 

类型 期刊 

语种 英语

标题 A dual function of SnRK2 kinases in the regulation of SnRK1 and plant growth

来源期刊 Nature Plant

期 第265期

发表时间 20201019

关键词 SnRK1;  SnRK2;  plant growth;  ABA;  phytohormone; 

摘要 Adverse environmental conditions trigger responses in plants that promote stress tolerance and survival at the expense of growth1. However, little is known of how stress signalling pathways interact with each other and with growth regulatory components to balance growth and stress responses. Here, we show that plant growth is largely regulated by the interplay between the evolutionarily conserved energy-sensing SNF1-related protein kinase 1 (SnRK1) protein kinase and the abscisic acid (ABA) phytohormone pathway. While SnRK2 kinases are main drivers of ABA-triggered stress responses, we uncover an unexpected growth-promoting function of these kinases in the absence of ABA as repressors of SnRK1. Sequestration of SnRK1 by SnRK2-containing complexes inhibits SnRK1 signalling, thereby allowing target of rapamycin (TOR) activity and growth under optimal conditions. On the other hand, these complexes are essential for releasing and activating SnRK1 in response to ABA, leading to the inhibition of TOR and growth under stress. This dual regulation of SnRK1 by SnRK2 kinases couples growth control with environmental factors typical for the terrestrial habitat and is likely to have been critical for the water-to-land transition of plants.

服务人员 孙小满

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