Knockout of the guard cell K+out channel and stomatal movements

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Knockout of the guard cell K+out channel and stomatal movements.

T he central roles of potassium channels in regulating membrane potential and controlling action potential repolarization are well documented (1). In plants an additional important function of potassium channels in mediating long-term potassium transport during cell movements, turgor changes, and tropisms has been proposed. Two guard cells surround each stomatal pore in leaves and control the o...

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Guard Cells: Transcription Factors Regulate Stomatal Movements

Recent work shows that transcription factors are necessary for stomatal movements in plants. Different members of the plant-specific R2R3-MYB transcription factor family are required for mediating stomatal opening in response to light and stomatal closure in response to darkness.

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Inward potassium channel in guard cells as a target for polyamine regulation of stomatal movements.

A number of studies show that environmental stress conditions such as drought, high salt, and air pollutants increase polyamine levels in plant cells. However, little is understood about the physiological function of elevated polyamine levels. We report here that polyamines regulate the voltage-dependent inward K(+) channel in the plasma membrane of guard cells and modulate stomatal aperture, a...

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Ca(2+) signalling and control of guard-cell volume in stomatal movements.

Stomatal guard cells are unique as a plant cell model and, because of the depth of knowledge now to hand on ion transport and its regulation, serve as an excellent model for the analysis of stimulus-response coupling in higher plants. Parallel controls - mediated by Ca(2+), H(+) protein kinases and phosphatases - regulate the gating of the K(+) and Cl(-) channels that facilitate solute flux for...

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A Guard-Cell-Specific MYB Transcription Factor Regulates Stomatal Movements and Plant Drought Tolerance

Stomatal pores located on the plant epidermis regulate CO(2) uptake for photosynthesis and the loss of water by transpiration. The opening and closing of the pore is mediated by turgor-driven volume changes of two surrounding guard cells. These highly specialized cells integrate internal signals and environmental stimuli to modulate stomatal aperture for plant survival under diverse conditions....

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ژورنال

عنوان ژورنال: Proceedings of the National Academy of Sciences

سال: 2003

ISSN: 0027-8424,1091-6490

DOI: 10.1073/pnas.1031801100