Abstract
This article comments on: A novel strigolactone‐miR156 module controls stomatal behaviour during drought recovery
Highlights
The changing climatic conditions have increased the occurrence of ecological disasters worldwide
Independent studies showed in Arabidopsis thaliana, Solanum lycopersicum, and Lotus japonicus that SL-depleted mutants exhibited reduced stomatal closure and hypersensitivity to a diverse array of stresses (Bu et al, 2014; Liu et al, 2015; Van Ha et al, 2014; Visentin et al, 2016)
Enhanced stomatal closure and overall amelioration of plant performance under drought were observed in plants exogenously supplied with SL (Lv et al, 2018; Visentin et al, 2016; Zhang, Lv, & Wang, 2018), and in plants for which SL production in the shoot was enhanced by grafting onto SL-depleted rootstocks (Visentin et al, 2016)
Summary
The changing climatic conditions have increased the occurrence of ecological disasters worldwide. What most of these studies consistently showed is that hypersensitivity to drought in SL-depleted lines correlated with lower ABA levels, and lower stomatal sensitivity to exogenous and/or endogenous ABA in stressed shoots (Bu et al, 2014; Liu et al, 2015; Lv et al, 2018; Van Ha et al, 2014; Visentin et al, 2016). By means of grafting experiments, Visentin et al (2016) proposed an elegant model in which the reduction of SL synthesis in waterdeprived tomato roots is a systemic stress signal causing SL accumulation in the shoots and a higher sensitivity to ABA in guard cells.
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