Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, India.
Plant Physiology Lab, Department of Botany, C.M.P. Degree College, A Constituent Post Graduate College of University of Allahabad, Prayagraj, 211002, India.
J Hazard Mater. 2020 May 15;390:121806. doi: 10.1016/j.jhazmat.2019.121806. Epub 2019 Dec 2.
An emerging stress of nanomaterials in soil and water is of great concern as it limits crop productivity and affects humans as well. Therefore, it is required to manage this problem. Silicon and plant growth promoting rhizobacteria has gained the engaging role in agriculture as (bio-)fertilizers. However, their role against silver nanoparticles (AgNPs) is still not known. Hence, present study was envisaged to investigate role of Si, PGPR and phytohormone indole acetic acid (IAA) in regulating AgNP stress in Brassica juncea seedlings. The study highlighted the impact of various treatments with respect to overproduction of reactive oxygen species, signaling molecule nitric oxide, oxidative markers like antioxidant enzymes and nonenzymatic components of ascorbate-glutathione pathway. Interestingly, silicon when present with AgNPs enhanced toxicity by reducing growth and mechanistic properties of B. juncea. Moreover, the results highlight the role of PGPR and IAA towards reduction in toxicity by promoting the plant growth under stressed conditions. Treatments AgNP + Si + PGPR/IAA were observed to significantly reduce the stress and enhance plant growth against treatment AgNPs alone. This reversal in toxicity by PGPR and IAA along with Si suggests the idea to formulate and utilize their combination as biofertilizers for eradicating the stress in near future.
纳米材料在土壤和水中所带来的新的压力引起了人们极大的关注，因为它限制了作物的生产力，并对人类产生影响。因此，有必要对这一问题进行管理。硅和植物促生根际细菌作为（生物）肥料在农业中已经发挥了重要作用。然而，它们对银纳米颗粒（AgNPs）的作用尚不清楚。因此，本研究旨在探讨硅、植物促生根际细菌和植物激素吲哚乙酸（IAA）在调节芥菜幼苗中 AgNP 胁迫中的作用。本研究重点研究了各种处理方法对活性氧、信号分子一氧化氮、抗氧化酶和抗坏血酸-谷胱甘肽途径非酶成分等氧化标记物的过度产生的影响。有趣的是，当硅与 AgNPs 一起存在时，通过降低芥菜的生长和力学特性，增强了其毒性。此外，研究结果还强调了 PGPR 和 IAA 的作用，即在胁迫条件下促进植物生长，从而降低毒性。与单独用 AgNPs 处理相比，用 AgNP+Si+PGPR/IAA 处理可以显著减轻毒性并促进植物生长。PGPR 和 IAA 与硅一起逆转毒性的这一现象表明，有必要制定并利用它们的组合作为生物肥料，以消除未来的压力。
