Laboratory of Plant Physiology, Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran.
Laboratory of Plant Physiology, Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran.
Plant Physiol Biochem. 2019 Feb;135:450-459. doi: 10.1016/j.plaphy.2018.11.015. Epub 2018 Nov 14.
The presence of heavy metals in the soils is undoubtedly one of the prime abiotic stresses in the world. There are a considerable amount of plant yield losses because of heavy metal stress. The goal of this study was to assess the morphological, physiological and biochemical changes in Alyssum inflatum Nyár. populations upon exposure to different levels of nickel (Ni) (0, 100, 200, 400) μM, salicylic acid (SA) (0, 50, 200) μM and jasmonic acid (JA) (0, 5, 10) μM. Results showed that there were no considerable interpopulation differences, including the shoot Ni concentrations. Reversing the effects of Ni, SA and JA decreased due to Ni accumulation in both populations. By increasing the levels of Ni stress, the fresh weight (FW) of shoot decreased, whereas the application of SA + JA elevated the FW of the shoot in NM plants. Also, SA + JA mitigated Ni oxidative effects by reducing HO concentration in both populations. The results revealed that the exposure of both M and NM plants to high Ni concentration increased superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX) activities compared to control in both populations. Conversely, APX activity was inhibited in NM plants. Furthermore, SA and JA treatments reversed the detrimental effects of Ni on carotenoid content and reduced the content of proline in plants exposed to Ni stress. All the above suggests that SA and JA confer tolerance to Ni stress in two population of A. inflatum via several mechanisms.
重金属在土壤中的存在无疑是世界上主要的非生物胁迫之一。由于重金属胁迫，相当数量的植物产量损失。本研究的目的是评估 Alyssum inflatum Nyár。种群在暴露于不同水平的镍（Ni）（0、100、200、400）μM、水杨酸（SA）（0、50、200）μM 和茉莉酸（JA）（0、5、10）μM 时形态、生理和生化变化。结果表明，包括 shoot Ni 浓度在内，种群间没有明显的差异。由于 Ni 积累，SA 和 JA 逆转 Ni 作用的效果降低。随着 Ni 胁迫水平的增加，shoot 的鲜重（FW）减少，而在 NM 植物中，SA+JA 提高了 shoot 的 FW。此外，SA+JA 通过降低两种群体中 HO 浓度减轻了 Ni 的氧化作用。结果表明，与对照相比，两种 M 和 NM 植物在高 Ni 浓度下暴露于高 Ni 浓度下，超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）活性均增加，而 NM 植物中 APX 活性受到抑制。此外，SA 和 JA 处理逆转了 Ni 对类胡萝卜素含量的不利影响，并降低了暴露于 Ni 胁迫下植物中脯氨酸的含量。综上所述，SA 和 JA 通过多种机制赋予两种 A. inflatum 种群对 Ni 胁迫的耐受性。
