Pathway analysis of the transcriptome and metabolome of salt sensitive and tolerant poplar species reveals evolutionary adaption of stress tolerance mechanisms.

BMC Plant Biology
Dennis JanzAndrea Polle

Abstract

Populus euphratica is a salt tolerant and Populus x canescens a salt sensitive poplar species. Because of low transcriptional responsiveness of P. euphratica to salinity we hypothesized that this species exhibits an innate activation of stress protective genes compared with salt sensitive poplars. To test this hypothesis, the transcriptome and metabolome of mature unstressed leaves of P. euphratica and P. x canescens were compared by whole genome microarray analyses and FT-ICR-MS metabolite profiling. Direct cross-species comparison of the transcriptomes of the two poplar species from phylogenetically different sections required filtering of the data set. Genes assigned to the GO slim categories 'mitochondria', 'cell wall', 'transport', 'energy metabolism' and 'secondary metabolism' were significantly enriched, whereas genes in the categories 'nucleus', 'RNA or DNA binding', 'kinase activity' and 'transcription factor activity' were significantly depleted in P. euphratica compared with P. x canescens. Evidence for a general activation of stress relevant genes in P. euphratica was not detected. Pathway analyses of metabolome and transcriptome data indicated stronger accumulation of primary sugars, activation of pathways for suga...Continue Reading

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Datasets Mentioned

BETA
AJ744953
AJ561195
FJ238512
CF231013
E-MEXP-1928
AJ778775
CX656348

Methods Mentioned

BETA
glycosylases
transcription profiling
PCR

Software Mentioned

REST
Statgraphics
Oligo Explorer
MyiQ
GeneChip
Mass Translator into Pathways
KEGG
SAM
The Ontologizer
Ontologizer

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