THE L-CYSTEINE DESULFHYDRASE 1 (DES1) IS REQUIRED FOR ABA-DEPENDENT STOMATAL CLOSURE

SCUFFI, D.; ÁLVAREZ, C.; LASPINA, N.; GOTOR, C.; LAMATTINA, L.; GARCÍA MATA, C.

Mar del Plata

Congreso; XXIX Reunión Argentina de Fisiología Vegetal; 2012

SAFV

Stomatal pore regulation is a key process for carbon and water homeostasis of terrestrial plants. Abscisic acid (ABA), the most studied regulator of stomatal movement, induces stomatal closure through volume changes of stomatal guard cells. Hydrogen sulfide (H2S) has recently emerged as a new component of ABA signaling network in guard cells. H2S, is a small gas considered as the third endogenous gaseous transmitter in both in animals and plants. In Arabidopsis, H2S is enzymatically produced in the cytosol by the L-cysteine desulfhydrase DES1. In our lab we have recently showed that H2S induces stomatal closure in different plant species.