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Ca2+-dependent and Ca2+-independent excretion modes of salicylic acid in tobacco cell suspension culture.

Abstract：

:14C-salicylic acid (SA) was used to monitor SA metabolism and its regulation in tobacco cell suspension culture. Two SA concentrations (20 microM and 200 microM) were used for comparison. SA was quickly taken up in both treatments, and the 200 microM-treated cells absorbed approximately 15 times that of 20 microM-treated cells within 5 min. More than 85% and 50% of the absorbed SA were excreted in free form to the culture medium within 5 h from cells treated with 200 microM and 20 microM SA, respectively. SA excretion was significantly inhibited by EGTA and the inhibition could be reversed by the addition of exogenous Ca2+ to the culture medium in the 200 microM SA treatment. However, EGTA had little or no effect on SA excretion in the 20 microM SA treatment. The data suggest that tobacco suspension-cultured cells may contain both Ca2+-dependent and Ca2+-independent pathways for SA excretion. Reduced glutathione (an active oxygen species scavenger), staurosporine (a protein kinase inhibitor), and cycloheximide (an inhibitor of de novo protein synthesis) also blocked intracellular SA excretion to the culture medium in the 200 microM but not in the 20 microM SA treatment. These data support the existence of alternative SA excretion pathways in tobacco suspension-cultured cells. Tobacco cells may use both Ca2+-dependent and Ca2+-independent excretion pathways to cope with different intracellular SA status, and the pathway influenced by EGTA, reduced glutathione, staurosporine, and cycloheximide is activated by SA at 200 microM, but not at 20 microM.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Chen HJ,Hou WC,Kuć J,Lin YH

keywords:

subject

Has Abstract

pub_date

2001-06-01 00:00:00

pages

1219-26

issue

359

eissn

0022-0957

issn

1460-2431

journal_volume

52

pub_type

杂志文章

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