Growth inhibition occurs independently of cell mortality in tomato (Solanum lycopersicum) exposed to high cadmium concentrations

Journal of Integrative Plant Biology
Christine Delpérée, Stanley Lutts

Abstract

In order to analyze the adaptation potential of tomato shoots to a sudden increase in Cd concentration, tomato plants (Solanum lycopersicum L. var. Ailsa Craig) were exposed under controlled environmental conditions to a high dose of this heavy metal (250 microM CdCl2) in nutrient solution for 7 and 14 d. Both root and shoot growth was completely inhibited but all plants remained alive until the end of the treatment. Cell viability remained unaffected but the activity of the mitochondrial alternative pathway was stimulated by Cd stress at the expense of the cytochrome pathway. Cadmium concentration was higher in roots than in shoots and a decrease in the rate of net Cd translocation was noticed during the second week of stress. Cadmium decreased both leaf conductance (g(l)) and chlorophyll concentration. However, the effect on net CO2 assimilation remained limited and soluble sugars accumulated in leaves. Photochemical efficiency of PSII (Fv/Fm) was not affected despite a decrease in the number of reaction centers and an inhibition of electron transfer to acceptors of PSII. It is concluded that tomato shoot may sustain short term exposure to high doses of cadmium despite growth inhibition. This property implies several physiolo...Continue Reading

Citations

Jan 7, 2015·Journal of Integrative Plant Biology·Xiao-Yan XuShao-Jian Zheng
Jul 15, 2016·Environmental Science and Pollution Research International·Danping YangDeti Xie
Mar 11, 2017·Environmental Science and Pollution Research International·Jing HouXiangke Wang
Jul 28, 2018·Environmental Science and Pollution Research International·Fernando Angelo PiottoRicardo Antunes Azevedo
Feb 10, 2010·Environmental Science & Technology·Christopher Moody, Iain D Green

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