Journal Title
Title of Journal: Photosynthetica
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Abbravation: Photosynthetica
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Publisher
The Institute of Experimental Biology of the Czech Academy of Sciences
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Authors: A Bernardini E Salvatori S Di Re L Fusaro G Nervo F Manes
Publish Date: 2015/06/24
Volume: 54, Issue: 1, Pages: 56-64
Abstract
This study was carried out to determine the effect of different zinc concentrations on the ecophysiological response of Salix clones four commercial clones “1962” “1968” “Drago” and “Levante” selected for short rotation coppice and one natural clone “Sacco” obtained from a contaminated area Gas exchanges chlorophyll a fluorescence JIPtest relative chlorophyll content and biometric parameters were measured in plants grown for fifteen days in soil containing Zn concentrations of 0 300 750 and 1500 mgZnCl2 kg−1 Ecophysiological response to metal stress differed in dependence on the Zn concentration and clone At the low Zn concentration 300 mg kg−1 the absence of any significant reductions in parameters investigated indicated an efficient plant homeostasis to maintain the metal content within phytotoxic limits Stomatal limitation observed at 750 and 1500 mg kg−1 which was found in all clones after three days of the treatment might be caused by indirect effects of metal on guard cells Among commercial clones “Drago” was more sensitive to Zn stress showing inhibition of growth while “1962” clone showed a downregulation of PSII photochemistry following the slowdown in the CalvinBenson cycle On the contrary the natural Salix clone “Sacco” performed better compared to the other clones due to activation of a photosynthetic compensatory mechanism
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