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University of Arizona (1983)

THE PHOTOSYNTHESIS OF TWO ATRIPLEX SPECIES AS A FUNCTION OF SALINITY

Gast, Timothy Curtis

Titre : THE PHOTOSYNTHESIS OF TWO ATRIPLEX SPECIES AS A FUNCTION OF SALINITY

Auteur : Gast, Timothy Curtis

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1983

Résumé
Two species of Atriplex, with different metabolic pathways for fixing CC>2> were grown for nine weeks in solutions containing various concentrations of salts. Photosynthesis, water potential, stomatal resistance to water diffusion, moisture content, dry matter production, and tissue ionic content were studied. Both species showed a decrease in shoot water potential with increasing salinity in the culture solution, due to an increase in shoot ash content. The photosynthetic rate of A. lentiformis was not affected significantly by salinity level. The photosynthesis of A. triangularis was reduced significantly at the highest salinity level, because of an increase in stomatal resistance. Both species showed a decrease in dry matter production with increasing salinity concentration. The lack of correlation between photosynthetic rate and dry matter prod uction is discussed, with emphasis on respiration rate and the production of compatible organic osmotica.

Mots clés : Atriplex lentiformis. ; Atriplex triangularis. ; Plants — Effect of salt on. ; Plants — Effect of salts on. ; Photosynthesis.

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