title: Proteomics approach for identifying osmotic-stress-related proteins in soybean roots.
abstract: Osmotic stress can endanger the survival of plants. To investigate the mechanisms by which plants respond to osmotic stress, protein profiles from soybean plants treated with polyethylene glycol (PEG) were monitored by a proteomics approach. Treatment with 10% aqueous PEG reduced the lengths of roots and hypocotyls of soybean seedlings. Proteins from soybean roots were separated by two-dimensional polyacrylamide gel electrophoresis, and 415 proteins were detected by Coomassie brilliant blue staining. Thirty-seven proteins changed by PEG treatment were analyzed using Edman sequencing and peptide-mass fingerprinting method and this group included proteins involved in disease/defense. Seven proteins were selected for further experiments using the results of cluster analysis and statistical analysis of the abundance change. A comparison with the effects of other abiotic stresses showed that caffeoyl-CoA-O-methyltransferase and 20S proteasome alpha subunit A were decreased and increased by abiotic stresses, respectively. Expression analyses of these transcripts were also changed by PEG treatment. Caffeoyl-CoA-O-methyltransferase and 20S proteasome alpha subunit A may control the sensitivity of several regulatory genes specific to short exposure to osmotic stress.
authors.affiliation: National Institute of Crop Science, Kannondai 2-1-18, Tsukuba 305-8518, Japan.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Toorchi
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Yukawa
authors.forename: Mohammad-Zaman
authors.initials: MZ
authors.lastname: Nouri
authors.forename: Setsuko
authors.initials: S
authors.lastname: Komatsu
mesh_terms: D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D008780:Methyltransferases / Q000378:metabolism; D009995:Osmosis / Q000187:drug effects; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism*; D011092:Polyethylene Glycols / Q000494:pharmacology; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism; D040901:Proteomics; D030262:Soybean Proteins / Q000378:metabolism*; D013025:Glycine max / Q000187:drug effects / Q000378:metabolism*; D013312:Stress, Physiological
chemical_list: D030262:Soybean Proteins; D011092:Polyethylene Glycols; D008780:Methyltransferases; C059825:caffeoyl-CoA O-methyltransferase; D046988:Proteasome Endopeptidase Complex