title: Eucalyptus tolerance mechanisms to lanthanum and cerium: subcellular distribution, antioxidant system and thiol pools.
abstract: Guanglin 9 (Eucalyptus grandis × Eucalyptus urophlla) and Eucalyptus grandis 5 are two eucalyptus species which have been found to grow normally in soils contaminated with lanthanum and cerium, but the tolerance mechanisms are not clear yet. In this study, a pot experiment was conducted to investigate the tolerance mechanisms of the eucalyptus to lanthanum and cerium. Cell walls stored 45.40-63.44% of the metals under lanthanum or cerium stress. Peroxidase and catalase activities enhanced with increasing soil La or Ce concentrations up to 200 mg kg(-1), while there were no obvious changes in glutathione and ascorbate concentrations. Non-protein thiols concentrations increased with increasing treatment levels up to 200 mg kg(-1), and then decreased. Phytochelatins concentrations continued to increase under La or Ce stress. Therefore, the two eucalyptus species are La and Ce tolerant plants, and the tolerance mechanisms include cell wall deposition, antioxidant system response, and thiol compound synthesis.
authors.affiliation: Key Laboratory of Soil Environment Protection of Sichuan Province, Wenjiang 611130, PR China; College of Resources and Environment, Sichuan Agricultural University, Wenjiang 611130, PR China.
authors.forename: Yichang
authors.initials: Y
authors.lastname: Shen
authors.affiliation: College of Resources and Environment, Sichuan Agricultural University, Wenjiang 611130, PR China; Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, PR China. Electronic address: rsz01@163.com.
authors.forename: Shirong
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Soil Environment Protection of Sichuan Province, Wenjiang 611130, PR China; College of Resources and Environment, Sichuan Agricultural University, Wenjiang 611130, PR China.
authors.forename: Sen
authors.initials: S
authors.lastname: Li
authors.affiliation: College of Resources and Environment, Sichuan Agricultural University, Wenjiang 611130, PR China.
authors.forename: Xiaoxun
authors.initials: X
authors.lastname: Xu
authors.affiliation: College of Resources and Environment, Sichuan Agricultural University, Wenjiang 611130, PR China.
authors.forename: Yongxia
authors.initials: Y
authors.lastname: Jia
authors.affiliation: Agricultural College, Sichuan Agricultural University, Wenjiang 611130, PR China.
authors.forename: Guoshu
authors.initials: G
authors.lastname: Gong
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D002563:Cerium / Q000378:metabolism*; D004785:Environmental Pollutants / Q000378:metabolism*; D005052:Eucalyptus / Q000187:drug effects* / Q000378:metabolism; D007811:Lanthanum / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D013045:Species Specificity; D013438:Sulfhydryl Compounds / Q000378:metabolism
chemical_list: D000975:Antioxidants; D004785:Environmental Pollutants; D013438:Sulfhydryl Compounds; D002563:Cerium; D007811:Lanthanum
keywords: Antioxidant system; Cerium; Eucalyptus; Lanthanum; Subcellular distribution; Thiol pools