Arsenate induced differential response in rice genotypes

Gupta, Meetu; Ahmad, Mohd Anwar

doi:10.1016/j.ecoenv.2014.04.030

Cited by 42 publications

(15 citation statements)

References 36 publications

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“…Generally, plant As exposure mostly enhanced the activities of these enzymes [72] or at least some of them (e.g., [73]). The results of Gupta and Ahmad [74] also showed differential responses of the antioxidant enzymes (SOD, CAT, APX) in two contrasting rice varieties. They found higher activities in leaves of a tolerant variety.…”

Section: Antioxidant Enzyme Activities As Affected By As Stressmentioning

confidence: 85%

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Multi-Component Antioxidative System and Robust Carbohydrate Status, the Essence of Plant Arsenic Tolerance

et al. 2020

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Arsenic (As) contaminates the food chain and decreases agricultural production through impairing plants, particularly due to oxidative stress. To better understand the As tolerance mechanisms, two contrasting tobacco genotypes: As-sensitive Nicotiana sylvestris and As-tolerant N.tabacum, cv. ‘Wisconsin’ were analyzed. The most meaningful differences were found in the carbohydrate status, neglected so far in the As context. In the tolerant genotype, contrary to the sensitive one, net photosynthesis rates and saccharide levels were unaffected by As exposure. Importantly, the total antioxidant capacity was far stronger in the As-tolerant genotype, based on higher antioxidants levels (e.g., phenolics, ascorbate, glutathione) and activities and/or appropriate localizations of antioxidative enzymes, manifested as reverse root/shoot activities in the selected genotypes. Accordingly, malondialdehyde levels, a lipid peroxidation marker, increased only in sensitive tobacco, indicating efficient membrane protection in As-tolerant species. We bring new evidence of the orchestrated action of a broad spectrum of both antioxidant enzymes and molecules essential for As stress coping. For the first time, we propose robust carbohydrate metabolism based on undisturbed photosynthesis to be crucial not only for subsidizing C and energy for defense but also for participating in direct reactive oxygen species (ROS) quenching. The collected data and suggestions can serve as a basis for the selection of plant As phytoremediators or for targeted breeding of tolerant crops.

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Section: Antioxidant Enzyme Activities As Affected By As Stressmentioning

confidence: 85%

“…These enzymes are responsible for degradation of H 2 O 2 , a potential source of highly reactive (HO•) and ( 1 O 2 ). Thus, their higher activities are generally perceived as plant oxidative stress markers [74]. However, antioxidant enzymes cannot remove the most reactive ROS, (HO•).…”

Section: Antioxidant Enzyme Activities As Affected By As Stressmentioning

confidence: 99%

Multi-Component Antioxidative System and Robust Carbohydrate Status, the Essence of Plant Arsenic Tolerance

et al. 2020

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“…As exposure induces reactive oxygen species (ROS) synthesis which leads to cellular membrane damage ( Kumar et al, 2013 , 2014b ). To cope with enhanced level of oxidative stress plants are equipped with antioxidant system that gets activated under As stress conditions ( Gupta and Ahmad, 2014 ; Singh et al, 2015 ). As induces the synthesis of phytochelatins (PCs) that bind to As III and sequester it into vacuole and reduces the free As in cytoplasm ( Dixit et al, 2015b ).…”

Section: Introductionmentioning

confidence: 99%

Nitric Oxide Alleviated Arsenic Toxicity by Modulation of Antioxidants and Thiol Metabolism in Rice (Oryza sativa L.)

et al. 2016

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Nitric oxide (NO) is a gaseous signaling molecule and has a profound impact on plant growth and development. It is reported to serve as pro oxidant as well as antioxidant in plant system. In the present study, we evaluated the protective role of NO against arsenate (AsV) toxicity in rice plants. AsV exposure has hampered the plant growth, reduced the chlorophyll content, and enhanced the oxidative stress, while the exogenous NO supplementation has reverted these symptoms. NO supplementation has reduced the arsenic (As) accumulation in root as well as shoot. NO supplementation to AsV exposed plants has reduced the gene expression level of OsLsi1 and OsLsi2. AsV stress significantly impacted thiol metabolism, it reduced GSH content and GSH/GSSG ratio, and enhanced the level of PCs. NO supplementation maintained the GSH/GSSG ratio and reduced the level of PCs. NO supplementation reverted AsV induced iron deficiency in shoot and had significant impact of gene expression level of various iron transporters (OsYSL2, OsFRDL1, OsIRT1, and OsIRO2). Conclusively, exogenous application of NO could be advantageous against AsV toxicity and could confer the tolerance to AsV stress in rice.

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“…As(III) có ñộc tính ñối với thực vật mạnh hơn As(VI). Sự chuyển hóa qua lại của hai dạng As phụ thuộc vào trạng thái oxy hóa khử của ñất [14]. Dưới tác ñộng của stress As, các quá trình phát sinh hình thái, sinh trưởng và phát triển, bao gồm sự nảy mầm, sự tăng trưởng chồi và rễ, khả năng gia tăng sinh khối và ñặc biệt là năng suất thường bị giới hạn [1].…”

Section: Mở đầUunclassified

“…Phân tích RT-PCR bán ñịnh lượng cho thấy 2 gen mã hóa cho các enzyme kháng oxy hóa, bao gồm peroxidase và catalase, gia tăng mức ñộ biểu hiện dưới tác ñộng của stress As. Các enzyme kháng oxy hóa (SOD, CAT, POD) ñược nhìn nhận là một hệ thống ñề kháng quan trọng của thực vật giúp chống lại stress oxy hóa gây ra bởi kim loại nặng [14]. Dùng kỹ thuật phân tích enzyme trên gel cho thấy hoạt ñộ của 3 isozyme SOD, CAT và POD trong rễ lúa ñã gia tăng rõ rệt dưới tác ñộng khi xử lý stress As.…”

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