Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 73, Issue -, Pages 57-63Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2010.09.017
Keywords
Boron; Chlorophyll fluorescence; Imaging analysis; Salinity; Closed growing system; Solanum lycopersicum
Categories
Funding
- European Commission
- Scuola Superiore Sant'Anna, Pisa, Italy
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Imaging chlorophyll fluorescence was used to study the response of greenhouse tomato grown in soilless culture to NaCl and B concentration in the irrigation water. The plants were grown in perlite with recycling nutrient solution, which was prepared with negligible concentration or 550 mg L(-1) of NaCl, and 0.5 or 2.0 mg L(-1) of B in the irrigation water. High B concentration resulted in evident necrosis of leaf margins. At high NaCl concentration the recycling nutrient solution was replaced more frequently than at low salinity and this resulted in lower B concentration in the root zone, thus limiting the incidence of necrotic areas in the leaves. Indeed, the severity of leaf damage was linearly related to the mean B concentration in the recycling water. In all treatments we observed a strong difference in B concentrations between marginal and central areas, the latter remaining green and viable even in condition of severe B toxicity, as indicated by the determination of chlorophyll fluorescence. A reduction of the photosynthetic activity was observed in the symptomatic areas of the leaves on the plants grown at high B concentration in the root zone as a result of reduced dissipation of the excess of excitation energy at PSII level. (C) 2010 Elsevier B.V. All rights reserved.
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