title: Comparison of cadmium-induced iron-deficiency responses and genuine iron-deficiency responses in Malus xiaojinensis.
abstract: The effects of the heavy metal Cd in Malus xiaojinensis were investigated using hydroponic cultures. Chlorophyll and Fe concentrations in young leaves were markedly decreased by Cd treatment, although Fe concentration was significantly enhanced in the roots. A comparative examination of the Fe-deficiency responses due to Fe deficiency and Cd treatment was also performed. Both Fe deficiency and Cd treatment induced responses similar to those of Fe-deficiency in M. xiaojinensis, including acidification of the rhizosphere, enhanced Fe(III) chelate reductase activity, and upregulation of the Fe-deficiency-responsive genes MxIRT1 and MxFRO2-Like. However, the Fe-deficiency responses induced by Cd treatment were different in intensity and timing from those induced by Fe deficiency.
authors.affiliation: Institute for Horticultural Plants, China Agricultural University, Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China.
authors.forename: Chao
authors.initials: C
authors.lastname: Gao
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.forename: Da-Shuang
authors.initials: DS
authors.lastname: Xiao
authors.forename: Chang-Peng
authors.initials: CP
authors.lastname: Qiu
authors.forename: De-Guo
authors.initials: DG
authors.lastname: Han
authors.forename: Xin-Zhong
authors.initials: XZ
authors.lastname: Zhang
authors.forename: Ting
authors.initials: T
authors.lastname: Wu
authors.forename: Zhen-Hai
authors.initials: ZH
authors.lastname: Han
mesh_terms: D002104:Cadmium / Q000378:metabolism / Q000633:toxicity*; D038181:FMN Reductase / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant / Q000187:drug effects; D007501:Iron / Q000378:metabolism; D000090463:Iron Deficiencies; D027845:Malus / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism
chemical_list: D002104:Cadmium; D007501:Iron; D038181:FMN Reductase; C023903:ferric citrate iron reductase