Alleviation of lead-induced physiological, metabolic, and ultramorphological changes in leaves of upland cotton through glutathione

Environmental Science and Pollution Research International
Mumtaz KhanShui Jin Zhu

Abstract

Plants face changes in leaves under lead (Pb) toxicity. Reduced glutathione (GSH) has several functions in plant metabolism, but its role in alleviating Pb toxicity in cotton leaves is still unknown. In the present study, cotton seedlings (28 days old) were exposed to 500 μM Pb and 50 μM GSH, both alone and in combination, for a period of 10 days, in the Hoagland solution under controlled growth conditions. Results revealed Pb-induced changes in cotton's leaf morphology, photosynthesis, and oxidative metabolism. However, exogenous application of GSH restored leaf growth. GSH triggered build up of chlorophyll a, chlorophyll b, and carotenoid contents and boosted fluorescence ratios (F v/F m and F v/F 0). Moreover, GSH reduced the malondialdehyde (MDA), hydrogen peroxide (H2O2), and Pb contents in cotton leaves. Results further revealed that total soluble protein contents were decreased under Pb toxicity; however, exogenously applied GSH improved these contents in cotton leaves. Activities of antioxidant enzymes (catalase (CAT), superoxide dismutase (SOD), peroxidase (POD), glutathione reductase (GR), and ascorbate peroxidase (APX)) were also increased by GSH application under Pb toxicity. Microscopic analysis showed that excess ...Continue Reading

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Citations

May 4, 2017·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Mirza HasanuzzamanMasayuki Fujita
Jun 16, 2019·Environmental Science and Pollution Research International·Mohd Irfan NaikooNishanta Rajakaruna
Nov 10, 2020·International Journal of Phytoremediation·Saiqa MenhasHassan Javed Chaudhary

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