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Global Changes in the Transcript and Metabolic Profiles during Symbiotic Nitrogen Fixation in Phosphorus-Stressed Common Bean Plants

Permanent URL:
http://handle.nal.usda.gov/10113/48039
Abstract:
Phosphorus (P) deficiency is widespread in regions where the common bean (Phaseolus vulgaris), the most important legume for human consumption, is produced, and it is perhaps the factor that most limits nitrogen fixation. Global gene expression and metabolome approaches were used to investigate the responses of nodules from common bean plants inoculated with Rhizobium tropici CIAT899 grown under P-deficient and P-sufficient conditions. P-deficient inoculated plants showed drastic reduction in nodulation and nitrogenase activity as determined by acetylene reduction assay. Nodule transcript profiling was performed through hybridization of nylon filter arrays spotted with cDNAs, approximately 4,000 unigene set, from the nodule and P-deficient root library. A total of 459 genes, representing different biological processes according to updated annotation using the UniProt Knowledgebase database, showed significant differential expression in response to P: 59% of these were induced in P-deficient nodules. The expression platform for transcription factor genes based in quantitative reverse transcriptase-polymerase chain reaction revealed that 37 transcription factor genes were differentially expressed in P-deficient nodules and only one gene was repressed. Data from nontargeted metabolic profiles indicated that amino acids and other nitrogen metabolites were decreased, while organic and polyhydroxy acids were accumulated, in P-deficient nodules. Bioinformatics analyses using MapMan and PathExpress software tools, customized to common bean, were utilized for the analysis of global changes in gene expression that affected overall metabolism. Glycolysis and glycerolipid metabolism, and starch and Suc metabolism, were identified among the pathways significantly induced or repressed in P-deficient nodules, respectively.
Author(s):
Hernández, Georgina , Valdés-López, Oswaldo , Ramírez, Mario , Goffard, Nicolas , Weiller, Georg , Aparicio-Fabre, Rosaura , Fuentes, Sara Isabel , Erban, Alexander , Kopka, Joachim , Udvardi, Michael K. , Vance, Carroll P.
Subject(s):
Phaseolus vulgaris , nitrogen fixation , gene expression , metabolomics , metabolome , phosphorus , nutrient deficiencies , root nodules , transcription factors , transcription (genetics) , gene expression regulation , biochemical pathways , genes , genetic improvement , Rhizobium tropici
Format:
p. 1221-1238.
Note:
Includes references
Source:
Plant physiology 2009 Nov., v. 151, no. 3
Language:
English
Publisher:
American Society of Plant Biologists
Year:
2009
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.