【原】Plant Cell Environ. |福建农林许卫锋教授揭示ABA对土壤干燥和恢复过程中根系生长的调控可能与生长素反应有关

脱落酸(ABA)在植物对水分亏缺的适应中发挥着重要作用，但其在不同干旱时期对根系生长(主根伸长和侧根数量)的调控作用尚不清楚。在这里，我们将野生型(WT)和缺乏aba(非)的番茄植株暴露于三个连续的干旱阶段(中度干燥:0-21天;严重干燥:22-47天，重新浇水:48-51天)。研究发现，中度干燥时WT增加了初生根的生长;在严重干燥条件下，保持较多的侧根、主根和总根长;并在重新浇水后产生更多的根。经过RNA-Seq分析，我们发现WT与未干燥或复水的根中生长素相关基因的表达模式不同。此外，在连续三个干旱阶段，外源IAA能部分恢复aba缺乏的非植株的根系生长。本研究结果表明，ABA对土壤干燥和恢复过程中番茄根系生长的调控与生长素响应有关。

Abscisic acid (ABA) plays an important role in plant adaptation to water deficits, but its role in regulating root growth (primary root elongation and lateral root number) during different drought-phases remains unclear. Here, we exposed wild-type (WT) and ABA-deficient (not) tomato plants to three continuous drought-phases (moderate drying: day 0–21; severe drying: day 22–47 and re-watering: day 48–51). It was found that WT increased primary root growth during moderate drying; maintained more lateral roots, and greater primary root and total root length under severe drying; and produced more roots after re-watering. After RNA-Seq analysis, we found that the auxin-related genes in root showed different expression patterns between WT and not under drying or re-watering. Further, exogenous supply of IAA partially recovered the root growth of ABA-deficient not plants under three continuous drought-phases. Our results suggested that ABA regulation of tomato root growth during soil drying and recovery can involve auxin response.

https:///10.1111/pce.14137

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