Nitric oxide regulation of leaf phosphoenolpyruvate carboxylase-kinase activity: implication in sorghum responses to salinity

MONREAL, J.A.; ARIAS-BALDRICH, C.; TOSSI, V.; FERIA, A.B.; RUBIO-CASAL, A.; GARCÍA MATA, C.; LAMATTINA, L.; GARCÍA-MAURIÑO, S.

PLANTA

SPRINGER

Lugar: Berlin; Año: 2013 vol. 238 p. 859 - 869

0032-0935

Nitric oxide (NO) is a signaling molecule that mediates many plant responses to biotic and abiotic stresses, including salt stress. Interestingly, salinity increases NO production selectively in mesophyll cells of sorghum leaves, where photosynthetic C4 phosphoenolpyruvate carboxylase (C4 PEPCase) is located. PEPCase is regulated by a phosphoenolpyruvate carboxylase-kinase (PEPCasek), which levels are greatly enhanced by salinity in sorghum. This work investigated whether NO is involved in this effect. NO donors (SNP, SNAP), the inhibitor of NO synthesis NNA, and the NO scavenger cPTIO were used for long- and short-term treatments