Research ArticlePlant biology

Coordinating the overall stomatal response of plants: Rapid leaf-to-leaf communication during light stress

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Science Signaling  20 Feb 2018:
Vol. 11, Issue 518, eaam9514
DOI: 10.1126/scisignal.aam9514

Sending a canopy-wide message

A stress experienced by one part of a plant can be transmitted to other parts of the plant not directly exposed to the stress. Although not all leaves in the canopy of a plant may be exposed to light at the same time, it is beneficial to coordinate the closure of pores in leaves called stomata to prevent desiccation. Devireddy et al. showed that a wave of reactive oxygen species (ROS) and Ca2+ enabled leaves experiencing light stress in Arabidopsis thaliana plants to trigger stomatal closure in leaves not exposed to light. Stomatal closure required abscisic acid in light-stressed leaves and jasmonic acid in nonexposed leaves, hormones previously implicated in stomatal closure. This coordinated and dynamic response may enable plants to acclimate to light stress.