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Transgenic expression of DwMYB2.impairs iron transport from root to shoot in Arabidopsis thaliana

Cell Research 2006年第10期16卷 830-840页

作者： yan-hong chen~(1,2,3) xue-{4. wu~5 hong-qing ling~4.wei-cai yang~1 ~1the key {14. of molecular and developmental biology,institute of genetics and developmental biology,Chinese Academy of sciences,beijing 100101 china ~2Graduate University of the Chinese Academy of sciences,19 Yuquan Road,beijing 10004.,china ~3School of Life Science,Nantong University,Nantong 226007 china ~4.he State key {14. of Plant Cell and Chromosome Engineering,institute of genetics and developmental biology,Chinese Academy of sciences,beijing 100101,china The key laboratory of {2. and developmental {4. Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China Graduate University of the Chinese Academy of sciences Beijing China School of Life Science Nantong University Nantong China Department of Botany University of British Columbia 6270 University Blvd. Vancouver Canada The State key laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China

In plant,iron uptake and homeostasis are tightly regulated to ensure its absorption from soil and to avoid excessiron in the *** genes involved in this process have been identified during past several years,but there are manyproblems remain unsolved in the genetic regulation of whole plant iron trafficking and *** transcriptionfactors contain tandem repeats of a～50 amino acid DNA-binding motif (R) and are involved in the regulation of manyaspects of plant development,hormone signaling and ***,we report that the ectopic expression of orchidR2.3-MYB gene DwMYB2.in Arabidopsis thaliana confers the transgenic plants hypersensitivity to iron *** DwMYB2.transgenic plants,the iron content in root is two-fold higher compared to that in wild-type root,while thereverse is true in *** imbalance of iron content in root and shoot suggested that the translocation of iron fromroot to shoot was affected by the expression of DwMYB2.in the transgenic ***,gene chip and reversetranscription-polymerase chain reaction analysis revealed that the ferric-chelate reductase gene,AtFRO2.and the irontransporter gene,AtIRT1 and AtIRT2.are up-regulated by DwMYB2.expression,while other potential iron transporterssuch as AtIREG1,AtFRD3 and NRAMP1 are *** addition,the expression of several putative peptidetransporters and transcription factors are also altered in the 35S::DwMYB2.transgenic *** data provide us insightinto the whole plant translocation of iron and identify candidate genes for iron homeostasis in plants despite the fact thata heterologous gene was expressed.

关键词： DwMYB2 iron uptake and homeostasis iron transporters Arabidopsis

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