Response of tomato plants to saline water as affected by carbon dioxide supplementation. II. Physiological responses Academic Article uri icon

abstract

  • SummaryPhotosynthesis of tomato plants (Lycopersicon esculentum (L.) Mill. cv. F144) was studied under conditions of CO2 supplementation and salinity. The purpose of the study was to elucidate the mechanisms underlying the effects of salinity on the acclimation of tomato plants to CO2 supplementation. Plants were grown under either low (355.mmol mol–1) or elevated (1200.6.50 mmol mol–1) CO2 and were irrigated with low concentrations of mixed salts. The highest salinity level (E.C. 7 dS m–1) was that used to produce quality tomatoes in the Negev highlands, in Israel. During early development (three weeks after planting), the net photosynthetic rate of the leaves was much higher under elevated CO2, and other than a slight decrease in quantum yield efficiency as measured by fluorescence (DF/F 9 m ), no signs of acclimation to high levels of CO2 were apparent. Clear acclimation to high CO2 concentration was evide t ten weeks after planting when the net photosynthetic rate, photosynthetic capacity, and carboxy...

publication date

  • January 1, 1999