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Multiple paths of sugar-sensing and a sugar/oxygen overlap for genes of sucrose and ethanol metabolism.

Abstract：

:The two-fold purpose of this work is, first, to review current hypotheses for multiple paths of sugar-sensing in an oxygen-responsive context, and second, to present evidence for the extent of sugar/oxygen overlap regulating genes for sucrose and ethanol metabolism. Current data indicate that sugar signals in plants may be initiated by (a) hexokinases, (b) membrane sensors, (c) acetate and/or respiratory metabolites, and (d) other signals and/or crosstalk. Responses may also involve concurrent input along transduction paths by effectors such as energy charge, P status, and phytohormones. Prime candidates for initiation and/or integration of such signal integration include SNF1- and SCF-like, multi-enzyme complexes. In addition, different paths of sugar signal transduction may be linked to contrasting roles of responsive genes during feast, famine or pathogen attack. Oxygen can potentially alter sugar signals at several points, so its influence on feast and famine responses was initially tested with genes for sucrose metabolism in maize root tips. The Sus1 and Sh1 sucrose synthases in maize (typically up-regulated by carbohydrate abundance and deprivation, respectively) showed parallel responses to hypoxia (3% O2 [0.03l l-1 O2]) and anoxia (0% O2 [0l l-1 O2]) that were consistent with involvement of similar signals. In contrast, the differential sugar-responses of the lvr1 and lvr2 invertases were not evident under low oxygen, and both genes were rapidly repressed. A third response was evident in the marked, sugar-regulation of an oxygen-responsive Adh1 gene for alcohol dehydrogenase, which was sensitive to sugar availability from deficit to abundance, regardless of oxygen status (anaerobic to fully aerobic [40% O2 (0.04l l-1 O2)]. A clear interface is thus evident between sugar and oxygen signals, but this varies markedly with the genes involved and probable differences in respective transduction paths.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Koch KE,Ying Z,Wu Y,Avigne WT

doi

10.1093/jexbot/51.suppl_1.417

keywords:

subject

Has Abstract

pub_date

2000-02-01 00:00:00

pages

417-27

eissn

0022-0957

issn

1460-2431

journal_volume

51 Spec No

pub_type

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Multiple paths of sugar-sensing and a sugar/oxygen overlap for genes of sucrose and ethanol metabolism.