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 550mgL -1 of NaCl, and 0.5 or 2.0mgL -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.
|Autori:||GUIDI L; DEGLINNOCENTI E; CARMASSI G; D. MASSA; A. PARDOSSI|
|Titolo:||Effects of boron on leaf chlorophyll fluorescence of greenhouse tomato grown with saline water|
|Anno del prodotto:||2011|
|Digital Object Identifier (DOI):||10.1016/j.envexpbot.2010.09.017|
|Appare nelle tipologie:||1.1 Articolo in rivista|