Wood Formation under Severe Drought Invokes Adjustment of the Hormonal and Transcriptional Landscape in Poplar.
Wood Formation under Severe Drought Invokes Adjustment of the Hormonal and Transcriptional Landscape in Poplar.
复制标题
严重干旱下的木材形成引起杨树激素和转录景观的调整
DOI：
10.3390/ijms22189899
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发表时间：
2021-09-13
影响因子：
5.6
通讯作者：
Polle A
中科院分区：
文献类型：
--
作者：
Yu D;Janz D;Zienkiewicz K;Herrfurth C;Feussner I;Chen S;Polle A
干旱是一种严重的环境胁迫，对植物生长产生负面影响。在树木中，干旱导致次生生长减少和木材解剖结构改变。木材胁迫适应的机制还不清楚。在这里，我们研究了白杨的生理，解剖，激素和转录响应强干旱。干旱胁迫下木质部导管频率增加，导管腔变小，次生纤维细胞壁变厚。这些变化伴随着脱落酸（阿坝）的强烈增加和木材中水杨酸的拮抗变化。转录证据支持ABA在木材中的生物合成和信号转导。由于阿坝信号激活纤维增厚因子NST 1，我们预期在胁迫下次生细胞壁（SCW）级联上调。与此相反，转录因子和SCW形成的生物合成基因下调，而一小部分纤维素酶样基因和大量的基因参与细胞壁修饰在干旱胁迫木材上调。因此，我们认为阿坝信号监测正常的SCW生物合成和干旱导致从正常的开关“应力木材”的形成招募一组专用的基因细胞壁的生物合成和重塑。这一命题意味着，干旱引起的细胞壁特性的变化的调节机制不同于正常木材。
Drought is a severe environmental stress that exerts negative effects on plant growth. In trees, drought leads to reduced secondary growth and altered wood anatomy. The mechanisms underlying wood stress adaptation are not well understood. Here, we investigated the physiological, anatomical, hormonal, and transcriptional responses of poplar to strong drought. Drought-stressed xylem was characterized by higher vessel frequencies, smaller vessel lumina, and thicker secondary fiber cell walls. These changes were accompanied by strong increases in abscisic acid (ABA) and antagonistic changes in salicylic acid in wood. Transcriptional evidence supported ABA biosynthesis and signaling in wood. Since ABA signaling activates the fiber-thickening factor NST1, we expected upregulation of the secondary cell wall (SCW) cascade under stress. By contrast, transcription factors and biosynthesis genes for SCW formation were down-regulated, whereas a small set of cellulose synthase-like genes and a huge array of genes involved in cell wall modification were up-regulated in drought-stressed wood. Therefore, we suggest that ABA signaling monitors normal SCW biosynthesis and that drought causes a switch from normal to “stress wood” formation recruiting a dedicated set of genes for cell wall biosynthesis and remodeling. This proposition implies that drought-induced changes in cell wall properties underlie regulatory mechanisms distinct from those of normal wood.
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