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Reference: Zhang M, et al. (2011) Functional analysis of metal tolerance proteins isolated from Zn/Cd hyperaccumulating ecotype and non-hyperaccumulating ecotype of Sedum alfredii Hance. FEBS Lett 585(16):2604-9

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Abstract

The Zn/Cd hyperaccumulating ecotype (HE) of Sedum alfredii Hance can accumulate 24- and 28-fold higher leaf and stem Zn concentrations when compared with the non-hyperaccumulating ecotype (NHE) of Sedum. Heterologous expression of a metal tolerance protein (MTP1) encoding gene from HE plants (SaMTP1) or the homologous gene from NHE plants (SnMTP1) suppressed Zn(2+) hypersensitivity in the ?zrc1 yeast mutant. In plants, SaMTP1 localized to the tonoplast. Furthermore, MTP1 transcript level in the shoot of HE plants was more than 80-fold higher than that of NHE plants. The transcript level of SaMTP1 in shoot was up-regulated 1-fold by Zn(2+) while the expression of SnMTP1 was slightly inhibited. These data suggest that SaMTP1 can play an important role in Zn accumulation in HE plants.

Reference Type
Journal Article
Authors
Zhang M, Senoura T, Yang X, Nishizawa NK
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