Environmental Science and Pollution Research Pub Date : 2021-05-15 , DOI: 10.1007/s11356-021-14252-3 Ting Wei 1 , Xian Li 1 , Noman Yashir 1 , Hong Li 1 , Yanni Sun 1 , Li Hua 1 , Xinhao Ren 1 , Junkang Guo 1
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In the present study, a hydroponic experiment was performed to evaluate the effect of exogenous silicon (Si) and methyl jasmonate (MeJA) on the mitigation of Cd toxicity in tomato seedlings. The results revealed that Cd-stressed plants exhibited growth inhibition, increased lipid peroxidation, and impaired photosynthetic pigment accumulation. However, Si and MeJA applied alone or in combination significantly ameliorated the above-mentioned adverse effects induced by Cd. Among all treatments, Cd+Si+MeJA treatment elevated the dry mass of roots, stems, and leaves by 317.39%, 110.85%, and 119.71%, respectively. The chlorophyll a, chlorophyll b, and carotenoid contents in Cd+Si+MeJA-treated group were dramatically elevated (p < 0.05). Meanwhile, the malondialdehyde content in roots and shoots were reduced by 32.24% and 69.94%, respectively. The Si and MeJA applied separately or in combination also resulted in a prominent decrease of Cd influxes in tomato roots; therefore, a reduction of Cd content in tomato tissues were detected, and the Cd concentration in tomato roots were decreased by 27.19%, 25.18%, and 17.51% in Cd+Si, Cd+MeJA and Cd+Si+MeJA-treated plants, respectively. Moreover, in Cd+Si+MeJA-treated group, the percentage of Cd in cell wall fraction was enhanced while that in organelle fraction was decreased as compared with Cd-stressed plants. Collectively, our findings indicated that Si and MeJA application provide a beneficial role in enhancing Cd tolerance and reducing Cd uptake in tomato plants.
Graphical abstract
中文翻译：
外源硅和茉莉酸甲酯对减轻镉致番茄植物毒性的影响
在本研究中，进行了水培实验以评估外源硅 (Si) 和茉莉酸甲酯 (MeJA) 对减轻番茄幼苗镉毒性的影响。结果表明，镉胁迫的植物表现出生长抑制、脂质过氧化增加和光合色素积累受损。然而，单独或联合应用 Si 和 MeJA 显着改善了上述由 Cd 引起的不利影响。在所有处理中，Cd+Si+MeJA处理使根、茎和叶的干重分别提高了317.39%、110.85%和119.71%。Cd+Si+MeJA处理组叶绿素a、叶绿素b和类胡萝卜素含量显着升高（p< 0.05)。同时，根和芽中丙二醛含量分别降低了32.24%和69.94%。Si 和 MeJA 单独或组合施用也显着减少了番茄根中 Cd 的流入量；因此，检测到番茄组织中的 Cd 含量降低，在 Cd+Si、Cd+MeJA 和 Cd+Si+MeJA 处理的植物中，番茄根部的 Cd 浓度降低了 27.19%、25.18% 和 17.51%，分别。此外，在 Cd+Si+MeJA 处理组中，与 Cd 胁迫的植物相比，细胞壁部分中 Cd 的百分比增加，而细胞器部分中的百分比减少。总的来说，我们的研究结果表明，Si 和 MeJA 的应用在提高番茄植物对镉的耐受性和减少对镉的吸收方面发挥了有益的作用。
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