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Overexpression of an auxilin-like gene (F9E10.5) can suppress Al uptake in roots of Arabidopsis.

Abstract：

:Plants resistant to aluminium (Al) stress were isolated from Arabidopsis thaliana enhancer-tagged mutant lines. Compared with the parental Col-7 control line, one of the resistant candidates, #355-2, showed a higher expression of the F9E10.5 gene (At1g75100) on chromosome 1, a lower Al content in whole roots, and a shorter root hair length (approximately 30%). Both Al influx and associated oxidative stress occurred in root hairs, as well as in root tips of Col-7; however, they were seen only in root tips of #355-2. Transgenic plants overexpressing the F9E10.5 gene showed a slightly higher Al resistance than their parental control line (Ler). The F9E10.5 gene encodes an auxilin-like protein related to the clathrin-uncoating process in endocytosis. Microscopic observation indicated that both Al ion influx and endocytosis activity were lower in root hair cells of the #355-2 line than in those of Col-7. These results suggested that overexpression of this auxilin-like protein inhibits endocytosis in root hair cells by a disturbance of the transport system as in animal cells shown previously. It was also suggested that a part of the Al influx occurred via endocytosis in root hair cells in Arabidopsis. The Al resistance in the #355-2 line may therefore be due to a lower Al uptake via endocytosis in the root hair region.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Ezaki B,Kiyohara H,Matsumoto H,Nakashima S

doi

10.1093/jxb/erl221

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

497-506

issue

3

eissn

0022-0957

issn

1460-2431

pii

erl221

journal_volume

58

pub_type

杂志文章

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