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The barley Jip23b gene.
Frieder Müller-Uri1, Verena Cameron-Mills, John Mundy
1Faculty of Pharmacy, Institute of Pharmaceutical Biology, University of Halle-Wittenberg, Hoher Weg 8, D-06120 Halle, Germany. fmueller@biologie.uni-erlangen.de
Biochimica Et Biophysica Acta
|May 29, 2002
Summary
Researchers identified the barley Jip23 gene, induced by jasmonate methyl ester (MeJA). Further analysis revealed jasmonate regulates Jip23 gene expression at the transcriptional level in barley leaves.
Area of Science:
- Plant molecular biology
- Gene regulation in crops
Background:
- The barley Jip23 gene encodes a 23,000-Da protein with an unknown function.
- Jasmonate methyl ester (MeJA) is known to induce gene expression in plants.
Purpose of the Study:
- To investigate the function and regulation of the barley Jip23 gene.
- To determine if jasmonate regulates Jip23 gene expression at the transcriptional level.
Main Methods:
- Isolation of the barley Jip23 gene and its 5' upstream sequence.
- Fusion of the Jip23 upstream sequence to the beta-glucuronidase (GUS) reporter gene.
- Introduction of the reporter construct into barley leaves via particle bombardment and analysis of GUS expression following MeJA treatment.
Main Results:
- The Jip23 gene was confirmed to be induced by MeJA in barley leaves.
- Using a Jip23 promoter-GUS reporter construct, GUS expression was enhanced approximately threefold upon jasmonate treatment.
- The 1.8 kb 5' upstream sequence of Jip23 was sufficient to confer jasmonate-inducible expression.
Conclusions:
- Jasmonate regulates the expression of the barley Jip23 gene at the transcriptional level.
- The 5' upstream region of Jip23 contains regulatory elements responsive to jasmonate.
- This study provides insights into the molecular mechanisms of jasmonate signaling in barley.