Effect of salinity on photosynthesis and photorespiration of two wheat species (Triticum durum cv. PEPE 2122 and Triticum aestivum cv. Marzotto)

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Abstract
At NaCl concentration up to 50 mM growth, dry weight, succulence and O2 evolution decreased while chlorophyll and protein content increased. 14CO2 fixation increased at 25 mM and decreased at 50 mM NaCl; also, carboxylating and photorespiratory enzyme activities were differently affected by increased salinity. The ratio between ribulose 1,5-diphosphate carboxylase and phosphoenolpyruvate carboxylase activities decreased, photorespiration rate was stimulated and the O2 evolving mechanism was inhibited.