Physiological and antioxidant responses of Salvinia natans exposed to chromium-rich wastewater
Physiological and antioxidant responses of Salvinia natans exposed to chromium-rich wastewater
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DOI：
10.1016/j.ecoenv.2009.03.015
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发表时间：
2009-09-01
影响因子：
6.8
通讯作者：
Nasim, Sekh Abdul
中科院分区：
文献类型：
--
作者：
Dhir, Bhupinder;Sharmila, P.;Nasim, Sekh Abdul
槐叶萍具有积累高浓度铬（Cr）的能力。研究了植物对富铬废水的生理效应和防御潜力。在光化学反应中，光系统I（PS I）和光系统II（PS II）的活性增加，植物暴露于富铬废水。荧光比值F-v/F-m没有改变植物暴露于铬。富铬废水处理后，植物的核酮糖-1，5-二磷酸羧化酶-加氧酶（Rubisco）活性下降，而转囊体pH梯度（Delta pH）（与磷酸化相关）增加。植物缺乏产生丙二醛的能力，但具有有效的酶和非酶抗氧化防御机制，在抑制氧化胁迫中发挥重要作用。抗氧化酶活性在富铬废水中表现出减缓作用。细胞抗氧化剂水平下降，表明其在保护免受铬引起的氧化应激方面具有防御作用。目前的研究结果表明，Salvinia具有有效的抗氧化机制，减少富铬废水引起的氧化应激，保护光合机构免受损害。(C)2009年由Elsevier Inc.出版
Salvinia natans possess capacity to accumulate high concentrations of chromium (Cr). Studies were carried out to evaluate physiological efficiency and defensive potential of plant exposed to Cr-rich wastewater. Among photochemical reactions, photosystem I (PS I) and photosystem II (PS II) activity noted an increase in plants exposed to Cr-rich wastewater. Fluorescence ratio F-v/F-m depicted no alteration in plants exposed to Cr. The activity of ribulose-1,5-biphosphate carboxylase-oxygenase (Rubisco) noted a decline, while transthylakoidal pH gradient (Delta pH) (correlative of photophosphorylation) showed increase in plants exposed to Cr-rich wastewater. Plants lacked the ability to produce malondialdehyde, but possessed efficient enzymic and non-enzymic antioxidant defense mechanisms that played important role in curtailing oxidative stress. The activities of antioxidant enzymes showed alleviation in plants exposed to Cr-rich wastewater. The levels of cellular antioxidants noted decline suggesting a defensive role in protection against oxidative stress caused by Cr. The present findings suggest that Salvinia possess efficient antioxidant machinery that curtails oxidative stress caused by Cr-rich wastewater and protects photosynthetic machinery from damage. (C) 2009 Published by Elsevier Inc.