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《Journal of Nuclear Agricultural Sciences》 2018-02
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Effects of Nano-TiO_2 on Growth and Gene Expression in Arabidopsis thaliana

LAN Lizhen;ZHAO Qunfen;JIN Kaixing;School of Marine Sciences,Ningbo University;  
To investigate the mechanism of nano-TiO_2 toxicity in environment,this research studied the effects of different concentrations( 0. 05,0. 1,0. 5,1,1. 5 mg·L~(-1)) nano-TiO_2 on seed germination,growth and gene transcription levels of Arabidopsis thaliana. The results showed that compared with the control group,1. 00 mg·L~(-1) and 1. 50 mg·L~(-1) treated-groups: the seed germination rate,germination potential and germination index were inhibited; The plant height,leaf area and chlorophyll content of seedlings decreased,and root length and root vigor went up. In plant root,the IAA content showed an upward trend while the ABA content was decreased. Under the treatment of 1. 50 mg·L~(-1),the contents of IAA and ABA in leaves decreased and increased,respectively. Lhcb3,CAO,Rubisco and RCA gene expression were first increased and then decreased. The results indicated that nano-TiO_2 slowed down the seed germination,inhibited the photosystem II activity,carbon assimilation and photosynthetic carbon metabolism,decreased photosynthesis efficiency and finally restrained the growth of Arabidopsis thaliana. The results provide a theoretical basis for further investigating the molecular mechanism of the toxic effects of nano-TiO_2 on plant toxicity and its biological effects in the ecological environment, and also provid provide the basis for environmental safety evaluation of nanomaterials.
【Fund】: 浙江省自然科学基金(ZX2013000355)
【CateGory Index】: Q943.2
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