Gasotransmitters are emerging as new guard cell signaling molecules and regulators of leaf gas exchange.
Specialized guard cells modulate plant gas exchange through the regulation of stomatal aperture. The size of the stomatal pore is a direct function of the volume of the guard cells. The transport of solutes across channels in plasma membrane is a crucial process in the maintenance of guard cell water status. The fine tuned regulation of that transport requires an integrated convergence of multiple endogenous and exogenous signals perceived at both the cellular and the whole plant level. Gasotransmitters are novel signaling molecules with key functions in guard cell physiology. Three gasotransmitters, nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H(2)S) are involved in guard cell regulatory processes. These molecules are endogenously produced by plant cells and are part of the guard cells responses to drought stress conditions through ABA-dependent pathways. In this review, we summarize the current knowledge of gasotransmitters as versatile molecules interacting with different components of guard cell signaling network and propose them as players in new paradigms to study ABA-independent guard cell responses to water deficit.
Instituto de Investigaciones Biológicas, Facultad de Ciencias Exactas y Naturales, UNMdP-CONICET, CC 1245, (7600) Mar del Plata, Argentina.
Carlos
C
García-Mata
Lorenzo
L
Lamattina
D000040:Abscisic Acid / Q000378:metabolism; D017360:Arabidopsis / Q000378:metabolism / Q000502:physiology; D001692:Biological Transport; D002248:Carbon Monoxide / Q000378:metabolism; D002450:Cell Communication; D005740:Gases / Q000378:metabolism*; D006862:Hydrogen Sulfide / Q000378:metabolism; D015640:Ion Channel Gating; D009569:Nitric Oxide / Q000378:metabolism; D059828:Plant Cells / Q000378:metabolism* / Q000502:physiology; D018515:Plant Leaves / Q000378:metabolism* / Q000502:physiology; D054046:Plant Stomata / Q000378:metabolism* / Q000502:physiology; D015398:Signal Transduction
D005740:Gases; D009569:Nitric Oxide; D000040:Abscisic Acid; D002248:Carbon Monoxide; D006862:Hydrogen Sulfide