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Abstract Guard cell pairs in the leaf epidermis enclose stomata, microscopic pores mediating CO2 uptake and water loss. Historical data suggest that signals from interior mesophyll tissue may modulate guard-cell regulation of stomatal apertures, but the molecular identity of any metabolite-based signals has remained elusive. We discovered that extracellular (apoplastic) fluid from Arabidopsis thaliana and Vicia faba enhances red-light-induced stomatal opening.
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