Phytochrome B and PCH1 protein dynamics store night temperature information,The Plant Journal

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Phytochrome B and PCH1 protein dynamics store night temperature information
The Plant Journal ( IF 6.2 ) Pub Date : 2020-10-24 , DOI: 10.1111/tpj.15034
Germán Murcia ₁ , Beatrix Enderle ₂ , Andreas Hiltbrunner _{2,

3} , Jorge J. Casal _{1,

4}

Affiliation

Plants experience temperature fluctuations during the course of the daily cycle, and although stem growth responds rapidly to these changes we largely ignore whether there is a short‐term memory of previous conditions. Here we show that nighttime temperatures affect the growth of the hypocotyl of Arabidopsis thaliana seedlings not only during the night but also during the subsequent photoperiod. Active phytochrome B (phyB) represses nighttime growth and warm temperatures reduce active phyB via thermal reversion. The function of PHOTOPERIODIC CONTROL OF HYPOCOTYL1 (PCH1) is to stabilise active phyB in nuclear bodies but, surprisingly, warmth reduces PCH1 gene expression and PCH1 stability. When phyB was active at the beginning of the night, warm night temperatures enhanced the levels of nuclear phyB and reduced hypocotyl growth rate during the following day. However, when end‐of‐day far‐red light minimised phyB activity, warm night temperatures reduced the levels of nuclear phyB and enhanced the hypocotyl growth rate during the following day. This complex growth pattern was absent in the phyB mutant. We propose that temperature‐induced changes in the levels of PCH1 and in the size of the physiologically relevant nuclear pool of phyB amplify the impact of phyB‐mediated temperature sensing.

中文翻译：

植物色素B和PCH1蛋白质动力学可存储夜间温度信息

植物在日常循环过程中会经历温度波动，尽管茎生长对这些变化反应迅速，但我们很大程度上忽略了是否对以前的条件有短期记忆。在这里，我们表明夜间温度不仅影响夜间，而且影响随后的光周期，都会影响拟南芥幼苗下胚轴的生长。活性植物色素B（phyB）抑制夜间生长，温暖的温度通过热还原降低活性phyB。光合控制HYPOCOTYL1（PCH1）的功能是稳定核体内的活性phyB，但令人惊讶的是，温度降低了PCH1基因表达和PCH1稳定性。当phyB在夜晚开始时处于活动状态时，温暖的夜晚温度会在第二天增加核phyB的水平并降低下胚轴的生长速率。但是，当日末远红外光使phyB活性最小化时，温暖的夜晚温度会降低第二天的phyB核水平并提高下胚轴生长速率。phyB突变体中不存在这种复杂的生长模式。我们认为，温度诱导的phyB水平和生理相关的phyB核库大小的变化会放大phyB介导的温度感测的影响。

更新日期：2020-10-24

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