Guard cell abscisic acid signalling and engineering drought hardiness in plants.
Guard cells are located in the epidermis of plant leaves, and in pairs surround stomatal pores. These control both the influx of CO2 as a raw material for photosynthesis and water loss from plants through transpiration to the atmosphere. Guard cells have become a highly developed system for dissecting early signal transduction mechanisms in plants. In response to drought, plants synthesize the hormone abscisic acid, which triggers closing of stomata, thus reducing water loss. Recently, central regulators of guard cell abscisic acid signalling have been discovered. The molecular understanding of the guard cell signal transduction network opens possibilities for engineering stomatal responses to control CO2 intake and plant water loss.
Division of Biology and Center for Molecular Genetics, University of California, San Diego, La Jolla 92093-0116, USA.
J I
JI
Schroeder
J M
JM
Kwak
G J
GJ
Allen
D000040:Abscisic Acid / Q000378:metabolism*; D000818:Animals; D017360:Arabidopsis; D015220:Calcium Channels / Q000378:metabolism; D003001:Cloning, Molecular; D004817:Epidermis / Q000378:metabolism; D050356:Lipid Metabolism; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D059828:Plant Cells; D018514:Plant Structures / Q000378:metabolism; D010944:Plants / Q000235:genetics / Q000378:metabolism*; D011494:Protein Kinases / Q000378:metabolism; D015290:Second Messenger Systems; D015398:Signal Transduction; D014981:Xenopus
D015220:Calcium Channels; D000040:Abscisic Acid; D011494:Protein Kinases; D010744:Phosphoric Monoester Hydrolases