欧亚国际

来自以色列的科学家利用Plantarray高通量植物生理表型平台和植物逆境生物学生理研究平台发表了题为Wild Wheat Introgression Promotes Temporal Water fluxes Dynamics under Terminal Drought Stress through Plant-Atmospheric Interrelations的文章。欧亚国际公司是该系统中国区合作伙伴，负责其系列产品在中国市场的推广、销售和售后服务。

摘要

植物所经历的水分胁迫强度取决于土壤水分状况以及大气变量，如温度、辐射和空气蒸汽压差（VPD）。尽管对这些土壤和大气因素在地上部结构中的作用进行了深入研究，但地上部和根系作为一个连续体的动态相互作用受基因型变异控制的程度尚不清楚。在这里，我们利用野生二聚体导入系（IL20）对这些相互作用进行了定位，该导入系具有明显的干旱诱导的茎根比变化，其轮回亲本Svevo是干旱敏感的。利用蒸渗重力测量平台，研究表明，在极端干旱条件下，IL20保持了较高的根系水分流入和气体交换，从支持了根系生长更大。有趣的是，在较低的VPD下，IL20在根系内流和蒸腾作用方面的优势在日循环中更早得已体现，因此支持较高的蒸腾效率。结构方程模型的应用表明，在水分胁迫下，VPD和辐射对蒸腾速率具有拮抗作用，而根系水分流入对叶片较高的大气响应具有反馈作用。总之，这些结果表明，由干旱引起的根冠比变化可以在水分和大气参数确定的较短时间窗口内提高植物的吸水潜力。 

Wild Wheat Introgression Promotes Temporal Water fluxes Dynamics under Terminal Drought Stress through Plant-Atmospheric Interrelations

August 2021

DOI:10.1101/2021.08.04.455065

Abstract and Figures

The intensity of water stress experienced by plants depends upon soil moisture status as well as atmospheric variables such as temperature, radiation, and air vapour pressure deficit (VPD). Although the role of shoot architecture with these edaphic and atmospheric factors is well-studied, the extent to shoot and root dynamic interactions as a continuum are controlled by genotypic variation is less known. Here, we targeted these interactions using a wild emmer introgression line (IL20) with a distinct drought-induced shift in the shoot-to-root ratio and its drought-sensitive recurrent parent Svevo. Using a gravimetric platform, we show that IL20 maintained higher root water influx and gas exchange under terminal drought, which supported a greater growth. Interestingly, the advantage of IL20 in root influx and transpiration was expressed earlier during the daily diurnal cycle under lower VPD and therefore supported higher transpiration efficiency. Application of structural equation model indicates that under water-stress, VPD and radiation are antagonistic to transpiration rate, whereas the root water influx operates as feedback for the higher atmospheric responsiveness of leaves. Collectively, these results suggest that a drought-induced shift in root-to-shoot ratio can improve plant water uptake potential in a short preferable time window determined by both water and atmospheric parameters.