谷胱甘肽还原酶
叶绿体
超氧化物歧化酶
抗氧化剂
氧化应激
光合作用
叶绿素
活性氧
毒性
过氧化物酶
化学
光合效率
生物
谷胱甘肽过氧化物酶
植物
园艺
生物化学
酶
有机化学
基因
作者
Iqra Noor,Hamza Sohail,Mirza Hasanuzzaman,Hak-Sung Kim,Guohuai Li,Junwei Liu
出处
期刊:Chemosphere
[Elsevier]
日期:2022-03-01
卷期号:291: 132999-132999
被引量:6
标识
DOI:10.1016/j.chemosphere.2021.132999
摘要
In this study, we evaluated the mitigative role of phosphorus (P) in terms of manganese (Mn) toxicity in peach (Prunus persica L.) plants. Ten-day-old seedlings were treated with excess Mn (1 mM MnSO4) alone and in combination with different P levels (100, 150, 200 and 250 μM KH2PO4) in half-strength Hoagland medium. The results demonstrated that Mn toxicity plants accumulated a significant amount of Mn in their tissues, and the concentration was higher in roots than in leaves. The accumulated Mn led to a considerable reduction in plant biomass, water status, chlorophyll content, photosynthetic rate, and disrupted the chloroplast ultrastructure by increasing oxidative stress (H2O2 and O2•-). However, P supplementation dramatically improved plant biomass, leaf relative water and chlorophyll contents, upregulating the ascorbate-glutathione pool and increasing the activities of antioxidant enzymes (superoxide dismutase; peroxidase dismutase; ascorbate peroxidase; monodehydroascorbate reductase; dehydroascorbate reductase), thus reducing oxidative damage as evidenced by lowering H2O2 and O2•- staining intensity. Moreover, P application markedly restored stomatal aperture and improved chloroplast ultrastructure, as indicated by the improved performance of photosynthetic machinery. Altogether, our findings suggest that P (250 μM) has a great potential to induce tolerance against Mn toxicity by limiting Mn accumulation in tissues, upregulating antioxidant defense mechanisms, alleviating oxidative damage, improving chloroplast ultrastructure and photosynthetic performance in peach plants.
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