Key Laboratory for Quality Regulation of Tropical Horticultural Crops of Hainan Province, School of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Center of Nanfan and High-Efficiency Tropical Agriculture, Hainan University, Sanya, 572025, China; Key Laboratory for Quality Regulation of Tropical Horticultural Crops of Hainan Province, School of Tropical Agriculture and Forestry, Hainan University, Danzhou, 571737, China.
Management School of Hainan University, Haikou, 570228, China.
Plant Physiol Biochem. 2024 Aug;213:108809. doi: 10.1016/j.plaphy.2024.108809. Epub 2024 Jun 8.
The primary goal of this research is to investigate the mitigating effect of silicon (Si; 2 mM) on the growth of tomato seedlings under vanadium (V; 40 mg) stress. V stress caused higher V uptake in leaf, and enhanced concentration of leaf anthocyanin, HO, O, and MDA, but a decreased in plant biomass, root architecture system, leaf pigments content, mineral elements, and Fv/Fm (PSII maximum efficiency). Si application increased the concentrations of crucial antioxidant molecules such as AsA and GSH, as well as the action of key antioxidant enzymes comprising APX, GR, DHAR, and MDHAR. Importantly, oxidative damage was remarkably alleviated by upregulation of these antioxidant enzymes genes. Moreover, Si application enhanced the accumulation of secondary metabolites as well as the expression their related-genes, and these secondary metabolites may restricted the excessive accumulation of HO. In addition, Si rescued tomato plants against the damaging effects of MG by boosting the Gly enzymes activity. The results confirmed that spraying Si to plants might diminish the V accessibility to plants, along with promotion of V stress resistance.
本研究的主要目的是探讨硅（Si；2 mM）对番茄幼苗在钒（V；40 mg）胁迫下生长的缓解作用。V 胁迫导致叶片中 V 吸收增加，叶片花青素、HO、O 和 MDA 浓度升高，但植物生物量、根系结构系统、叶片色素含量、矿物质元素和 Fv/Fm（PSII 最大效率）降低。硅的应用增加了重要抗氧化分子如 AsA 和 GSH 的浓度，以及包括 APX、GR、DHAR 和 MDHAR 在内的关键抗氧化酶的活性。重要的是，这些抗氧化酶基因的上调显著减轻了氧化损伤。此外，硅的应用增强了次生代谢物的积累以及它们相关基因的表达，这些次生代谢物可能限制了 HO 的过度积累。此外，硅通过提高甘氨酸酶的活性来拯救番茄植物免受 MG 的破坏。结果证实，向植物喷洒硅可能会降低 V 对植物的可及性，并促进 V 胁迫抗性。
