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

Passera, C.; Albuzio, A.

Canadian Journal of Botany 56(1): 121-126


ISSN/ISBN: 0008-4026
DOI: 10.1139/b78-013
Accession: 000355499

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When grown in a controlled environment, addition of 25 or 50 mM NaCl/day in the watering sol. reduced the growth, dry wt., succulence and O2 evolution and increased the chlorophyll and CP content of durum wheat cv. PEPE 2122 and wheat cv. Marzotto plants. 14CO2 fixation increased with 25 mM NaCl and declined with 50 mM. Carboxylating and photorespiratory enzyme activities were differently affected by increasing salinity, while the ratio between ribulose 1,5-diphosphate carboxylase and phosphoenolpyruvate carboxylase activities was decreased, photorespiration rate increased and the O2-evolving mechanism inhibited.