Characterization of the Arabidopsis metallothionein gene family: Tissue-specific expression and induction during senescence and in response to copper

Woei Jiun Guo, Weenun Bundithya, Peter B. Goldsbrough

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206 引文 斯高帕斯(Scopus)

摘要

• Expression and regulation of Arabidopsis metallothionein (MT) genes were investigated to examine the functions of MTs in plants. • To examine the tissue-specific expression of MT genes, GUS reporter gene activity driven by promoters of MT1a, MT2a, MT2b and MT3 was analysed in transgenic plants. • MT1a and MT2b are expressed in the phloem of all organs and are copper (Cu)-inducible; MT2a and MT3, by contrast, are expressed predominantly in mesophyll cells and are also induced by Cu in young leaves and at root tips. Expression of MT genes is highly induced by Cu in trichomes and increases during senescence. Expression of MT4 genes is restricted to seeds. • We propose that plant MTs have distinct functions in heavy metal homeostasis, especially for Cu: MT1a and MT2b are involved in the distribution of Cu via the phloem, while MT2a and MT3 chaperone excess metals in mesophyll cells and root tips. These functional capabilities may allow MTs to play a role in mobilization of metal ions from senescing leaves and the sequestration of excess metal ions in trichomes.

原文English
頁(從 - 到)369-381
頁數13
期刊New Phytologist
159
發行號2
DOIs
出版狀態Published - 2003 8月 1

All Science Journal Classification (ASJC) codes

  • 生理學
  • 植物科學

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