Faisal Mohammad, Faizan Mohammad, Soysal Sipan, Alatar Abdulrahman A
Department of Botany & Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia.
Botany Section, School of Sciences, Maulana Azad National Urdu University, Hyderabad, India.
Front Plant Sci. 2024 Oct 15;15:1484600. doi: 10.3389/fpls.2024.1484600. eCollection 2024.
Unfavorable environmental conditions pose a major barrier to sustainable agriculture. Among the various innovative strategies developed to protect plants from abiotic stress, the use of phytohormones and nanoparticles as "stress mitigators" has emerged as one of the most important and promising approaches. The objective of this study was to observe the protective role of melatonin (Mel) and silicon oxide nanoparticles (SiO-NPs) in rice ( L.) seedlings under cadmium (Cd) stress. Rice seedlings have reduced growth and phytochemical attributes when grown in Cd-contaminated (0.8 mM) pots. Seedlings under Cd stress had 38% less shoot length (SL), 53% total soluble sugar (TSS) and 57% protein content. However, superoxide dismutase (SOD), hydrogen peroxide (HO) and malondialdehyde (MDA) increased by 51%, 37% and 34%, respectively, under Cd stress. Beside this, activities such as peroxidase (POX) also elevated in the plants subjected with Cd-stress. In contrast, Mel (100 µm) as foliar spray and SiO-NPs (100 mg/L) as root dipping reduced oxidative stress in rice seedlings under Cd stress by reducing reactive oxygen species (ROS) generation. Furthermore, the application of Mel and/or SiO-NPs significantly increased the activity of antioxidative enzymes that scavenge ROS. The combined application of SiO-NPs and Mel increased growth, gas exchange and photosynthetic attributes, chlorophyll value, and protein content. It causes alleviation in the activity of SOD, CAT and POX by 73%, 62% and 65%, respectively. Overall, this study findings show that Mel and/or SiO-NPs can potentially protect the rice crop against oxidative damage under Cd stress.
不利的环境条件是可持续农业面临的主要障碍。在为保护植物免受非生物胁迫而开发的各种创新策略中，使用植物激素和纳米颗粒作为“胁迫缓解剂”已成为最重要且最具前景的方法之一。本研究的目的是观察褪黑素（Mel）和二氧化硅纳米颗粒（SiO-NPs）在镉（Cd）胁迫下对水稻（L.）幼苗的保护作用。在镉污染（0.8 mM）的花盆中种植时，水稻幼苗的生长和植物化学特性会降低。镉胁迫下的幼苗茎长（SL）减少38%，总可溶性糖（TSS）减少53%，蛋白质含量减少57%。然而，在镉胁迫下，超氧化物歧化酶（SOD）、过氧化氢（HO）和丙二醛（MDA）分别增加了51%、37%和34%。除此之外，过氧化物酶（POX）等活性在遭受镉胁迫的植物中也有所升高。相比之下，叶面喷施褪黑素（100 µm）和根部浸泡二氧化硅纳米颗粒（100 mg/L）通过减少活性氧（ROS）的产生，降低了镉胁迫下水稻幼苗的氧化应激。此外，褪黑素和/或二氧化硅纳米颗粒的应用显著提高了清除活性氧的抗氧化酶的活性。二氧化硅纳米颗粒和褪黑素的联合应用增加了生长、气体交换和光合特性、叶绿素值以及蛋白质含量。它使超氧化物歧化酶、过氧化氢酶和过氧化物酶的活性分别降低了73%、62%和65%。总体而言，本研究结果表明，褪黑素和/或二氧化硅纳米颗粒有可能保护水稻作物免受镉胁迫下的氧化损伤。
