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Abstract Detail


Plant-Pathogen Interactions

Damaj, Mona B. [1], Beremand, Phillip P. [2], Al-Douri, Abdulhamid F. [2], Silva, Marcelo A. [3], Jifon, John L. [4], Kumpatla, Siva P. [5], Reddy, A. Sam [6], Thomas, Terry L. [2], Mirkov, T. Erik [7].

Coordinated stress response in sugarcane: salicylic acid-, jasmonic acid- and pathogen-mediated defense genes are co-expressed with antioxidant and drought-responsive genes.

Several signal molecules, including salicylic acid and jasmonic acid, are involved in the regulation of biotic and abiotic stresses via synergistic and antagonistic actions, referred to as signaling crosstalk. The present study was initiated to provide more insights into the stress signaling crosstalk in sugarcane, a high biomass producer and sucrose accumulator. Using transcriptional profiling, we examined changes in the abundance of transcripts corresponding to 6,024 genes in the Affymetrix sugarcane genechip in response to: (a) treatment with the signal compounds, salicylic acid (SA), jasmonic acid (JA) or methyl jasmonate (MeJA) or, (b) infection with the compatible pathogen Sorghum mosaic virus (SrMV). Substantial changes (2-fold up- and down-regulation) in the level of gene transcripts were observed in plants responding to one or more treatment, with a large number of genes being co-induced by SA, MeJA and JA. The most significant co-induction pattern was observed for genes belonging to 3 large functional groups. The first group represented genes associated with oxidative burst and hypersensitive responses. The second group included genes associated with plant defense mechanisms. The third group comprised drought-responsive genes. In addition, many genes that were 2-fold induced by SA, MeJA and JA were down-regulated upon SrMV infection. Our data reveals a high level of coordination during plant defense among the SA-, jasmonate- and pathogen-induced defense signaling pathways. It also suggests the existence of crosstalk between defense and other signaling pathways such as drought. Ongoing studies on the physiological responses of plants pre-treated with SA, MeJA or JA to drought will assess the protective role of SA and jasmonates against drought in sugarcane.


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1 - Texas A&M University System, Texas Agricultural Experiment Station, 2415 East Hwy. 83, Weslaco, TX, 78596, United States
2 - Texas A&M University, Biology
3 - APTA Regional Centro-Oeste, Horticulture
4 - Texas A&M University System, Texas Agricultural Experiment Station, Horticulture
5 - DowAgroSciences LLC, Trait Genetics and Technologies
6 - DowAgroSciences LLC, Molecular Biology and Traits
7 - Texas A&M University System, Texas Agricultural Experiment Station, Plant Pathology and Microbiology

Keywords:
jasmonate signaling
salicylate signaling
signaling crosstalk
plant pathogen interaction
sugarcane
sorghum mosaic virus
drought response
oxidative burst
plant defense.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P15079
Abstract ID:1923


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