Iron oxide nanoparticles impart cross tolerance to arsenate stress in rice roots through involvement of nitric oxide. (15th August 2022)

• Record Type: Journal Article
• Authors: Rai, Padmaja; Pratap Singh, Vijay; Sharma, Samarth; Tripathi, Durgesh Kumar; Sharma, Shivesh
• Is Part Of: Environmental pollution. Volume 307(2022)
• Publication Date: 2022-08-15
• Subjects: Arsenic (As–V) -- Iron oxide nanoparticles (FeO NPs) -- Root -- Rice -- Nitric oxide (NO) -- Toxic; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2022.119320
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The growth and development patterns of crop plants are being seriously threatened by arsenic (As) contamination in the soil, and it also acts as a major hurdle in crop productivity. This study focuses on arsenate As(V) mediated toxicity in rice plants. Further, among the different type of NPs, iron oxide nanoparticles (FeO NPs) display a dose-dependent effect but their potential role in mitigating As(V) stress is still elusive. FeO NPs (500 μM) play a role in imparting cross-tolerance against As(V) induced toxicity in rice. Growth attributes, photosynthetic performance, nutrient contents and biochemical parameters were significantly altered by As(V). But FeO NPs rescued the negative consequences of As(V) by restricting its entry with the possible involvement of NO in rice roots. Moreover, results related with gene expression of NO( OsNoA1 and OsNIA1 ) and proline metabolism were greatly inhibited by As(V) toxicity. But, FeO NPs reversed the toxic effect of As(V) by improving proline metabolism and stimulating NO mediated up-regulation of antioxidant enzymes particularly glutathione- S -transferase which may be possible reasons for the reduction of As(V) toxicity in rice roots. Overall, it can be stated that FeO NPs may act as an As(V) barrier to restrict the As(V) uptake by roots and have the ability to confer cross tolerance by modulating various morphological, biochemical and molecular characteristics with possible intrinsic involvement of NO. Graphical abstract: Image 1 Highlights: FeONPs and As decline the root growth, pigments and nutrients. Enhanced FeONPs and As uptake increased the ROS regulation. In combined treatments FeONPs starts declining the As toxicity in roots. NO is involved in FeONPs induced cross-tolerance of As toxicity.