Lead-stress induced changes in the content of free, thylakoid- and chromatin-bound polyamines, photosynthetic parameters and ultrastructure in greening barley leaves

Journal of Plant Physiology
Jolanta LegockaSławomir Samardakiewicz

Abstract

The aim of this study was to determine the impact of lead (Pb) stress as 0.6mM Pb(NO3)2 on the content of free, thylakoid- and chromatin-bound polyamines (PAs) and diamine oxidase (DAO) activity in detached greening barley leaves. Additionally, photosynthetic-related parameters, generation of hydrogen peroxide (H2O2) and malondialdehyde (MDA) content and ultrastructural changes under Pb-stress were studied. The level of putrescine (Put) was reduced progressively to 56% at 24h of Pb stress, and it was correlated with 38% increase of DAO activity. Spermidine (Spd) content was not affected by Pb-stress, while the free spermine (Spm) level significantly increased by about 83% at 6h, and in that time the lowest level of H2O2 was observed. The exogenous applied Spm to Pb-treated leaves caused a decrease in the content of H2O2. In greening leaves exposed to Pb an accumulation of chlorophylls a and b was inhibited by about 39 and 47%, respectively, and photosynthetic parameters of efficiency of electron transport and photochemical reaction in chloroplasts as ΦPSII, ETR and RFd were lowered by about 23-32%. The level of thylakoid-bound Put decreased by about 22%. Moreover, thylakoids isolated from chloroplasts of Pb-treated leaves were ...Continue Reading

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Citations

May 21, 2016·Frontiers in Plant Science·Ann CuypersEls Keunen
Jan 1, 2017·Amino Acids·E Sobieszczuk-Nowicka
Jul 11, 2020·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Khalid Hasan Alamer, Khalaf Ali Fayez

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