Physiological and transcriptomic response reveals new insight into manganese tolerance of Celosia argentea Linn.

作者：Liyun Liang, Mu Ze, Jun Yang, Qian Xu, Cunmei Du, Xiaohong Hu, Ming Dong, Lijuan Zou, Tuo Qi · 发表于：Journal of Hazardous Materials · 年份：2023 · DOI：10.1016/j.jhazmat.2023.133079 · 被引用次数：26 · 研究领域：Plant Stress Responses and Tolerance、Plant Micronutrient Interactions and Effects、Plant responses to elevated CO2

Celosia argentea is a manganese (Mn) hyperaccumulator with high ornamental value and strong stress resistance. It is important to understand the molecular mechanism of tolerance to heavy metals of hyperaccumulators to improve the efficiency of phytoremediation. In this study, the effects of different Mn concentrations (0, 0.8, 3, and 10 mM) on physiological characteristics and molecular changes were determined. Low concentrations of Mn increased the growth of C. argentea, while high concentrations of Mn suppressed its growth, A concentration up to 3 mM did not affect the growth of C. argentea, and the highest transfer factor (TF) was 6.16. Oxidative damage of different Mn level treatments in C. argentea was verified through relative water content, electrolyte leakage, MDA content, H2O2 content and superoxide contents. With an increase in Mn concentration, the contents of chlorophyll a, chlorophyll b, and carotenoids decreased. Our results indicated that low-concentration manganese treatment can reduce the reactive oxygen burst and MDA, soluble sugar and proline, making C. argentea have strong abiotic stress tolerance. The molecular mechanism of C. argentea after 10 mM Mn treatment was analysed through transcriptome analysis, and differentially expressed genes (DEGs) in these pathways were further verified by qRTPCR. Plantpathogen interactions, plant hormone signal transduction, the MAPK signalling pathway and the phenylpropanoid biosynthesis pathway were important in the resp...