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    當前位置 > 首頁 > 新聞動態 > 科技前沿
    植物感知和記憶環境變化的的機制
    更新日期: 2019-01-28 作者: Daniel J. Gibbs等 文章來源:《自然通訊》
    打印 文本大小:    

     

     

     伯明翰大學和諾丁漢大學的植物科學家揭示了一種使開花植物能夠感知和記憶環境變化的機制。

    Nature Communications》文章報道,潛在的新目標可以支持開發適應不同環境條件的植物新品種,包括谷物和蔬菜。

    植物的記憶功能使它們能根據逆境或季節變化精確地協調發育。例如,許多植物都記得冬天的持續寒冷,確保只在真正的春天來臨時才開花。背后的協調者是一組名為PRC2的蛋白質。在寒冷時期,這些蛋白以復合體的形式聚在一起。很少有人知道PRC2如何檢測環境變化,以確保在正確的時機協調開花。

    研究人員發現,這種復合物的核心成分是一種名為VRN2的蛋白質,它非常不穩定,在溫暖和氧氣充足時,VRN2蛋白不斷分解。當環境條件變差,例如被水淹或低氧時,VRN2變得穩定以提高植物存活率。寒冷條件下,VRN2蛋白也跟著不斷積累,當溫度升高,PRC2復合物通過VRN2變化觸發開花。令研究人員感到驚奇的是,植物在應對洪水或低氧等挑戰時與面對寒冷時的反應驚人的相似。

    植物具有感知和記憶環境變化的顯著能力,這使得它們可以自行掌控生命周期,文章一作Daniel Gibbs博士解釋。“VRN2在不需要時被分解,在特殊環境條件下積累。可以說,VRN2直接感知并響應來自環境的信號,并且保持PRC2按兵不動直到有需要為止。

    在全球氣候發生變化的今天,這項研究的意義十分明顯。動物也有PRC2復合體,但是不具有不穩定的VRN2蛋白。這個系統似乎是開花植物自己進化出來的,”Holdsworth教授補充。也許讓植物在適應和應付環境變化中更具靈活性。這一點很重要,因為植物基本是固定在地面上的,不能移動。(來源:生物通 伍松)

     

    Oxygen-dependent proteolysis regulates the stability of angiosperm polycomb repressive complex 2 subunit VERNALIZATION 2

     

    Abstract  The polycomb repressive complex 2 (PRC2) regulates epigenetic gene repression in eukaryotes. Mechanisms controlling its developmental specificity and signal-responsiveness are poorly understood. Here, we identify an oxygen-sensitive N-terminal (N-) degron in the plant PRC2 subunit VERNALIZATION(VRN) 2, a homolog of animal Su(z)12, that promotes its degradation via the N-end rule pathway. We provide evidence that this N-degron arose early during angiosperm evolution via gene duplication and N-terminal truncation, facilitating expansion of PRC2 function in flowering plants. We show that proteolysis via the N-end rule pathway prevents ectopic VRN2 accumulation, and that hypoxia and long-term cold exposure lead to increased VRN2 abundance, which we propose may be due to inhibition of VRN2 turnover via its N-degron. Furthermore, we identify an overlap in the transcriptional responses to hypoxia and prolonged cold, and show that VRN2 promotes tolerance to hypoxia. Our work reveals a mechanism for post-translational regulation of VRN2 stability that could potentially link environmental inputs to the epigenetic control of plant development.

     

    原文鏈接:https://www.nature.com/articles/s41467-018-07875-7

     


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