Bilgin, Damla , Clough, Steven , De Lucia, Evan .
Divergence in plant gene expression because of elevated atmospheric O3 and CO2 and their affect on host- pathogen interactions.
Plants have numerous defence mechanisms many of which are induced by the pathogen attack or various environmental stresses. Although the ultimate response may be different, abiotic and biotic stress-induced signaling pathways share many common genes and nodes. Changes in the concentrations of atmospheric gases played a significant role in the evolution of organisms and their interactions with each other. Increasing levels of ozone (O3) and carbon dioxide (CO2) in the atmosphere causes changes in the gene expression profile of plants and their response to pathogens and other stresses. We used soybean plants, an economically important crop, to study the effects of global atmospheric change on gene expression and plant-pathogen interaction. Soybean plants grown in the field under elevated O3 or CO2 were tested against virus infection. Both treatments increased the resistance of susceptible plants to Soybean Mosaic Virus (SMV). Gene expression analysis with Affymetrix arrays showed that the nonspecific resistance response induced by elevated O3 is different than CO2 induced response. Elevated O3 treatment induced isoflavone biosynthesis and pathogenesis- related genes PR1, PR5 and PR10. Elevated CO2 changed the cell number and size of foliar tissue and differentially regulated cell cycle and plant development related genes. The similar and different effects of elevated O3 and CO2 on plant gene expression and plant –pathogen interactions will be discussed. Various reasons of nonspecific resistance induced by the two major components of global atmospheric change will be presented.
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1 - University of Illinois at Urbana- Champaign, Institute for Genomic Biology, 1206 W. Gregory Dr., Rm 1409, Urbana, IL, 61801, USA
2 - University of Illinois at Urbana- Champaign, USDA, National Soybean Research Center
3 - University of Illinois at Urbana- Champaign, Institute for Genomic Biology
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM