Phenotypic changes in Arabidopsis caused by expression of a yeast vacuolar Ca2+/H+ antiporter.

Abstract:

:In plants, cytosolic Ca2+ levels are tightly regulated, and changes in cytosolic Ca2+ have been implicated in converting numerous signals into adapted responses. Vacuolar ion transporters are thought to be key mediators of cytosolic Ca2+ concentrations. In an attempt to interpret the role of vacuolar Ca2+ transport in plant processes, we have expressed the yeast vacuolar Ca2+/H+ antiporter, VCX1, in Arabidopsis and tobacco. This transporter localizes to the plant vacuolar membrane. VCX1-expressing Arabidopsis plants displayed increased sensitivity to sodium and other ions. These ion sensitivities could be suppressed by addition of calcium to the media. VCX1-expressing plants demonstrated increased tonoplast-enriched Ca2+/H+ antiport activity as well as increased Ca2+ accumulation. These results suggest that VCX1 expression in Arabidopsis could be a valuable tool with which to experimentally dissect the role of Ca2+ transport around the plant vacuole.

journal_name

Plant Mol Biol

journal_title

Plant molecular biology

authors

Hirschi KD,Miranda ML,Wilganowski NL

doi

10.1023/a:1010620227913

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

57-65

issue

1

eissn

0167-4412

issn

1573-5028

journal_volume

46

pub_type

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