Abstract
Gasotransmitters and Stomatal Closure: Is There Redundancy, Concerted Action, or Both?
Highlights
The epidermis of the aerial part of land plants is pierced by pores through which plants perform gas exchange with environment
A gasotransmitter is a small gas molecule that: (i) can freely permeates biological membranes; (ii) it is endogenously generated by specific enzymes; (iii) it has specific functions at physiologically relevant concentrations; (iv) it functions can be mimicked by exogenous application of a donor; and (v) it has specific cellular and molecular targets (Wang, 2002)
An example of this in plants is the case of abscisic acid (ABA)-dependent induction of stomatal closure, where it has been reported that, on the one hand, ABA induces H2S production which in turn increases endogenous Nitric Oxide (NO) levels triggering stomatal closure (García-Mata and Lamattina, 2010; Scuffi et al, 2014), while on the other hand, it is reported that exogenous addition of H2S decreases ABA-dependent NO
Summary
More than a decade of work on the participation of NO on the regulation of stomatal movement resulted in a more or less bounded idea of its mechanism of action, in particular in those events triggered by ABA. ABA-dependent ROS production induces NO synthesis via NR/NOS-like activities
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