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Search: L773:1365 3040 OR L773:0140 7791 > (2010-2014) > Changes in external...

Changes in external pH rapidly alter plant gene expression and modulate auxin and elicitor responses

Lager, Ida (author)
Lund University,Lunds universitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science
Andreasson, Ola (author)
Dunbar, Tiffany L. (author)
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Andreasson, Erik (author)
Lund University,Lunds universitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science
Escobar, Matthew A. (author)
Rasmusson, Allan (author)
Lund University,Lunds universitet,Molekylär cellbiologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Molecular Cell Biology,Department of Biology,Faculty of Science
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 (creator_code:org_t)
2010-04-22
2010
English.
In: Plant, Cell and Environment. - : Wiley. - 0140-7791 .- 1365-3040. ; 33:9, s. 1513-1528
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • pH is a highly variable environmental factor for the root, and plant cells can modify apoplastic pH for nutrient acquisition and in response to extracellular signals. Nevertheless, surprisingly few effects of external pH on plant gene expression have been reported. We have used microarrays to investigate whether external pH affects global gene expression. In Arabidopsis thaliana roots, 881 genes displayed at least twofold changes in transcript abundance 8 h after shifting medium pH from 6.0 to 4.5, identifying pH as a major affector of global gene expression. Several genes responded within 20 min, and gene responses were also observed in leaves of seedling cultures. The pH 4.5 treatment was not associated with abiotic stress, as evaluated from growth and transcriptional response. However, the observed patterns of global gene expression indicated redundancies and interactions between the responses to pH, auxin and pathogen elicitors. In addition, major shifts in gene expression were associated with cell wall modifications and Ca2+ signalling. Correspondingly, a marked overrepresentation of Ca2+/calmodulin-associated motifs was observed in the promoters of pH-responsive genes. This strongly suggests that plant pH recognition involves intracellular Ca2+. Overall, the results emphasize the previously underappreciated role of pH in plant responses to the environment.

Subject headings

NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Keyword

gene expression
elicitor
cell wall
calcium
auxin
apoplast
Arabidopsis thaliana
pathogen response
transcriptome

Publication and Content Type

art (subject category)
ref (subject category)

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