Molecular targets of elevated [CO2 ] in leaves and stems of Populus deltoides: implications for future tree growth and carbon sequestration

Functional Plant Biology : FPB
Nathalie DruartVaughan Hurry

Abstract

We report the first comprehensive analysis of the effects of elevated [CO2] on gene expression in source leaf and stem sink tissues in woody plants. We have taken advantage of coppiced Populus deltoides (Bartr.) stands grown for 3 years under three different and constant elevated [CO2] in the agriforest mesocosms of Biosphere 2. Leaf area per tree was doubled by elevated [CO2] but although growth at 800 v. 400 µmol mol-1 CO2 resulted in a significant increase in stem biomass, growth was not stimulated at 1200 µmol mol-1 CO2. Growth under elevated [CO2] also resulted in significant increases in stem wood density. Analysis of expression data for the 13 490 clones present on POP1 microarrays revealed 95 and 277 [CO2]-responsive clones in leaves and stems respectively, with the response being stronger at 1200 µmol mol-1. When these [CO2]-responsive genes were assigned to functional categories, metabolism-related genes were the most responsive to elevated [CO2]. However within this category, expression of genes relating to bioenergetic processes was unchanged in leaves whereas the expression of genes for storage proteins and of those involved in control of wall expansion was enhanced. In contrast to leaves, the genes up-regulated in...Continue Reading

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Citations

Apr 25, 2008·Plant, Cell & Environment·Amanda Pereira De SouzaMarcos Silveira Buckeridge
Apr 26, 2012·PLoS Genetics·Christina L RichardsMichael D Purugganan
May 31, 2014·Tree Physiology·Gea GuerrieroJean-Francois Hausman
Jan 1, 2014·Plant, Cell & Environment·Katri KostiainenElina Vapaavuori

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Methods Mentioned

BETA
transgenic

Software Mentioned

AxioVision
GenePix Pro4
Bioconductor R
EASE
GeneSpring
Limma ( Linear Models for Microarray data )
Bioconductor

Related Concepts