Vascular-mediated signalling involved in early phosphate stress response in plants
Vascular-mediated signalling involved in early phosphate stress response in plants
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DOI：
10.1038/nplants.2016.33
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发表时间：
2016-04
期刊：
影响因子：
18
通讯作者：
Zhaoliang Zhang;Yi Zheng;B. Ham;Jieyu Chen;A. Yoshida;L. Kochian;Z. Fei;W. J. Lucas
中科院分区：
文献类型：
--
作者：
Zhaoliang Zhang;Yi Zheng;B. Ham;Jieyu Chen;A. Yoshida;L. Kochian;Z. Fei;W. J. Lucas
全球磷酸盐岩（Pi）储量有限，其枯竭将对未来农业生产力和粮食安全造成重大限制。因此，现代育种计划寻求在减少的Pi肥料投入下开发具有可持续产量的Pi高效作物。在这方面，虽然植物对Pi胁迫的长期响应被充分记录，但早期信号事件尚未被阐明。在这里，我们显示植物组织特异性的反应，在转录水平和植物维管系统在这一过程中的主导作用的早期PI应力。具体地，P1胁迫的施加诱导韧皮部易位流中mRNA群体的快速和主要变化，并且嫁接研究已经揭示了数百种韧皮部移动mRNA被递送到特定的库组织。我们认为，茎维管系统充当根源性Pi应激感知的位点，而韧皮部则负责向各个汇传递级联信号，推测是为了协调全株Pi的动态平衡。
Depletion of finite global rock phosphate (P i) reserves will impose major limitations on future agricultural productivity and food security. Hence, modern breeding programmes seek to develop P i-efficient crops with sustainable yields under reduced P i fertilizer inputs. In this regard, although the long-term responses of plants to P i stress are well documented, the early signalling events have yet to be elucidated. Here, we show plant tissue-specific responses to early P i stress at the transcription level and a predominant role of the plant vascular system in this process. Specifically, imposition of P i stress induces rapid and major changes in the mRNA population in the phloem translocation stream, and grafting studies have revealed that many hundreds of phloem-mobile mRNAs are delivered to specific sink tissues. We propose that the shoot vascular system acts as the site of root-derived P i stress perception, and the phloem serves to deliver a cascade of signals to various sinks, presumably to coordinate whole-plant P i homeostasis.