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Independent induction of two blue light-dependent monovalent anion transport systems in the plasma membrane of Monoraphidium braunii.

Abstract：

:In the plasma membrane of the green alga Monoraphidium braunii there are at least two monovalent anion transport systems. One of them is specific for bicarbonate. This transport system is activated by blue light and its induction is triggered by a decrease in the external CO2 concentration. The second transport system is responsible for nitrate uptake at least. This transport system is also activated by blue light and its induction occurs when there is no ammonium in the external medium. Both transport systems are synthesized independently. Hence, when M. braunii cells grow with nitrate as the only nitrogen source under high CO2, they have a nitrate transport system but lack a bicarbonate transporter. Conversely, cells grown with ammonium under low CO2, have a bicarbonate transport system but lack a nitrate transporter. Both transport systems are induced in cells irradiated with white light in the absence of a carbon source, suggesting that there may be precursors in the plasma membrane that only need the synthesis and assembly of some component(s) to become fully active. The induction of nitrate and nitrite reductases, however, only takes place when a carbon source is supplied to the cells.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Mora C,Witt FG,Aparicio PJ,Quiñones MA

doi

10.1093/jxb/erf056

keywords:

subject

Has Abstract

pub_date

2002-09-01 00:00:00

pages

1909-18

issue

376

eissn

0022-0957

issn

1460-2431

journal_volume

53

pub_type

杂志文章

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