Polyamines modulate aluminum-induced oxidative stress differently by inducing or reducing H2 O2 production in wheat

Chemosphere
Yan YuXianyong Lin

Abstract

Polyamines are important bioactive molecules involved in regulating H2O2 homeostasis, which is recognized as a major stimulus of oxidative stress under aluminum (Al) exposure. In this study, we investigated the involvement of spermidine oxidation in Al-induced oxidative stress, and its modulation by exogenous putrescine (Put) in two wheat genotypes differing in Al tolerance. Aluminum caused more severe oxidative damage at the root apexes in the Al-sensitive genotype Yangmai-5 than in the tolerant Xi Aimai-1, but these effects were significantly reversed by exogenous Put and polyamine oxidase (PAO) inhibitors. Aluminum caused a more significant increase in cell wall-bound PAO (CW-PAO) activity in Yangmai-5 than in Xi Aimai-1. Inhibiting of CW-PAO reduced H2O2 accumulation, restored Spd decline in both genotypes, indicating its potential role in Al-induced H2O2 production through catalyzing Spd oxidation. Additionally, Al significantly increased the activity of plasma membrane-NADPH oxidase, another H2O2 generator, in wheat roots. Put application significantly inhibited the activity of CW-PAO and plasma membrane-NADPH oxidase, and reduced H2O2 accumulation in Al-stressed wheat roots. Antioxidant enzymes were significantly stimula...Continue Reading

Citations

Jul 3, 2019·International Journal of Molecular Sciences·Mirza HasanuzzamanMasayuki Fujita
Oct 6, 2020·Frontiers in Plant Science·Hanmei DuSuzhi Zhang
May 28, 2019·Frontiers in Plant Science·Wei WangJi-Hong Liu
Sep 30, 2020·Plant Molecular Biology·Faisal Zulfiqar, Muhammad Ashraf
May 22, 2021·Plant Physiology and Biochemistry : PPB·M Iqbal R KhanChirag Maheshwari

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