Research ArticlePlant biology

Phosphorylation of the vacuolar anion exchanger AtCLCa is required for the stomatal response to abscisic acid

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Science Signaling  08 Jul 2014:
Vol. 7, Issue 333, pp. ra65
DOI: 10.1126/scisignal.2005140

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One Exchanger to Open and Close the Pores

Turgor pressure in the guard cells of plant leaves controls pores called stomata, which enable gas exchange and photosynthesis when open and limit water loss when closed. Light opens these pores, whereas the hormone abscisic acid (ABA) keeps them closed. Ions and water imported into or released from the vacuole control the turgor pressure of guard cells. Wege et al. found that Arabidopsis plants lacking the vacuolar anion/proton exchanger AtCLCa did not effectively open or close their stomata. In light, AtCLCa mediated the uptake of anions into the vacuole to aid in opening the pores, and ABA stimulated AtCLCa phosphorylation and enhanced its efflux activity, which helped to close the pores. Thus, a single exchanger can move ions bidirectionally depending on the plant’s photosynthetic and water conservation needs.

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