Physiological and molecular bases of the nickel toxicity responses in tomato  

作　　者：Hao Yu Weimin Li Xiaoxiao Liu Qianqian Song Junjun Li Jin Xu 

机构地区：[1]College of Horticulture,Shanxi Agricultural University,Taigu 030801,China [2]Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower,Taiyuan 030031,China

出　　处：《Stress Biology》2024年第1期448-464,共17页逆境生物学(英文)

基　　金：supported by the China National Natural Sciences Foundation(32070314)to J.X.

摘　　要：Nickel(Ni),a component of urease,is a micronutrient essential for plant growth and development,but excess Ni is toxic to plants.Tomato(Solanum lycopersicum L.)is one of the important vegetables worldwide.Excessive use of fertilizers and pesticides led to Ni contamination in agricultural soils,thus reducing yield and quality of tomatoes.However,the molecular regulatory mechanisms of Ni toxicity responses in tomato plants have largely not been elucidated.Here,we investigated the molecular mechanisms underlying the Ni toxicity response in tomato plants by physiobiochemical,transcriptomic and molecular regulatory network analyses.Ni toxicity repressed photosynthesis,induced the formation of brush-like lateral roots and interfered with micronutrient accumulation in tomato seedlings.Ni toxicity also induced reactive oxygen species accumulation and oxidative stress responses in plants.Furthermore,Ni toxicity reduced the phytohormone concentrations,including auxin,cytokinin and gibberellic acid,thereby retarding plant growth.Transcriptome analysis revealed that Ni toxicity altered the expression of genes involved in carbon/nitrogen metabolism pathways.Taken together,these results provide a theoretical basis for identifying key genes that could reduce excess Ni accumulation in tomato plants and are helpful for ensuring food safety and sustainable agricultural development.

关 键 词：Nickel toxicity MICRONUTRIENTS Oxidative stress response PHYTOHORMONES Transcription regulatory network 

分 类 号：S64[农业科学—蔬菜学]