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  EXO modifies sucrose and trehalose responses and connects the extracellular carbon status to growth

Lisso, J., Schröder, F., & Müssig, C. (2013). EXO modifies sucrose and trehalose responses and connects the extracellular carbon status to growth. Frontiers in plant science, 4. doi:10.3389/fpls.2013.00219.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-766D-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-766E-4
Genre: Journal Article

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Lisso, J.1, Author              
Schröder, F.1, Author              
Müssig, C.1, Author              
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1Brassinosteroids, Cooperative Research Groups, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753314              

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 Abstract: Plants have the capacity to adapt growth to changing environmental conditions. This implies the modulation of metabolism according to the availability of carbon (C). Particular interest in the response to the C availability is based on the increasing atmospheric levels of CO2. Several regulatory pathways that link the C status to growth have emerged. The extracellular EXO protein is essential for cell expansion and promotes shoot and root growth. Homologous proteins were identified in evolutionarily distant green plants. We show here that the EXO protein connects growth with C responses. The exo mutant displayed altered responses to exogenous sucrose supplemented to the growth medium. Impaired growth of the mutant in synthetic medium was associated with the accumulation of starch and anthocyanins, altered expression of sugar-responsive genes, and increased abscisic acid levels. Thus, EXO modulates several responses related to the C availability. Growth retardation on medium supplemented with 2-deoxy-glucose, mannose, and palatinose was similar to the wild type. Trehalose feeding stimulated root growth and shoot biomass production of exo plants whereas it inhibited growth of the wild type. The phenotypic features of the exo mutant suggest that apoplastic processes coordinate growth and C responses.

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Language(s): eng - English
 Dates: 2013
 Publication Status: Published in print
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 Identifiers: ISI: 23805150
DOI: 10.3389/fpls.2013.00219
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Title: Frontiers in plant science
Source Genre: Journal
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Pages: - Volume / Issue: 4 Sequence Number: - Start / End Page: - Identifier: ISSN: 1664-462X