Institute of Botany, University of the Punjab, Lahore, Pakistan.
Department of Botany, University of Narowal, Narowal, Pakistan.
Chemosphere. 2022 Jan;287(Pt 3):132332. doi: 10.1016/j.chemosphere.2021.132332. Epub 2021 Sep 21.
Nanotechnology has become a valuable novel approach to manage several environmental challenges through providing innovative and effective solutions. Heavy metal stress is an important abiotic limiting factor. Seed priming with selenium (Se) alleviates various kinds of environmental stresses; yet, the potential of seed priming with selenium nanoparticles (SeNPs) under cadmium (Cd) stress for coriander crop has never been evaluated. This research work was designed to explore the effects of seed priming with three levels (0, 5, 10 and 15 mg L) of SeNPs solution on the physio-biochemical characteristics, nutrition, antioxidative defense system and growth of coriander under Cd stress. Cadmium toxicity reduced chlorophyll content, photosynthetic activity and growth of treated plants. Moreover, Cd stressed plants exhibited modulations in proline level, together with decreased water potential, and leaf osmotic potential. However, SeNPs increased growth attributes, chlorophyll content, total soluble sugars, leaf relative water content, and gas exchange parameters in treated plants which were conversely decreased by Cd toxicity. The seeds priming with SeNPs promoted antioxidant response by increasing catalase (CAT), ascorbate peroxidase (APX) and peroxidase (POX) activity and safeguarding cellular structures through scavenging free radicals and reactive oxygen species. Furthermore, Cd stressed plants displayed an upper level of MDA (1.91 fold) while SeNPs improved membranous integrity through detoxification of hydrogen peroxide. Additionally, SeNPs enhanced nutrients contents (P, K, Ca, Mg, Zn), metal tolerance index and diminished Cd content in plants resulting in the improved growth and development of Cd affected coriander plants.
纳米技术已成为一种有价值的新方法，可以通过提供创新和有效的解决方案来应对多种环境挑战。重金属胁迫是一种重要的非生物限制因素。用硒（Se）对种子进行引发处理可以缓解各种环境胁迫；然而，用硒纳米粒子（SeNPs）对种子进行引发处理以缓解镉（Cd）胁迫对芫荽作物的潜在影响尚未得到评估。本研究旨在探讨用 SeNPs 溶液（0、5、10 和 15 mg L）的三个水平对种子进行引发处理对 Cd 胁迫下芫荽的生理生化特性、营养、抗氧化防御系统和生长的影响。Cd 毒性降低了叶绿素含量、光合作用活性和处理植物的生长。此外，Cd 胁迫植物表现出脯氨酸水平的调节，同时降低水势和叶片渗透势。然而，SeNPs 增加了处理植物的生长属性、叶绿素含量、总可溶性糖、叶片相对水含量和气体交换参数，而 Cd 毒性则降低了这些参数。SeNPs 通过增加过氧化氢酶（CAT）、抗坏血酸过氧化物酶（APX）和过氧化物酶（POX）的活性来促进抗氧化反应，并通过清除自由基和活性氧来保护细胞结构。此外，Cd 胁迫植物显示出较高水平的 MDA（1.91 倍），而 SeNPs 通过对过氧化氢的解毒来改善膜的完整性。此外，SeNPs 提高了营养物质含量（P、K、Ca、Mg、Zn）、金属耐受性指数，并减少了植物中的 Cd 含量，从而改善了受 Cd 影响的芫荽植物的生长和发育。
