Abscisic acid-regulated Glb1 transient expression in cultured maize P3377 cells

Abscisic acid-regulated Glb1 transient expression in cultured maize P3377 cells In a study of the 5′-flanking sequence of the Zea mays L. (maize) Glb1 gene in vitro, serial promoter deletions were generated and linked with the β -glucuronidase (GUS) reporter gene. The promoter deletion-GUS fusions were introduced into the maize P3377 cell line by particle bombardment. GUS assays indicated that treatment of the maize cultured cells with abscisic acid (ABA) was required for Glb1 -driven GUS transient expression, and that the –272-bp sequence of the Glb1 promoter was sufficient for ABA-regulated expression of GUS. The longest undeleted sequence used, –1391 GUS, showed relatively low expression which could be indicative of an upstream silencer element in the Glb1 promoter between –1391 and –805. Further studies show that the Glb1 -driven GUS activity of bombarded maize P3377 cells increases with increasing ABA concentration (up to 100–300 μ m ). Site-directed mutagenesis of a putative ABA response element, Em1a, abolished GUS expression in P3377 cells. This observation indicated that the Em1a sequence in the Glb1 5′ regulatory region is responsible for the positive ABA regulation of gene expression. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell Reports Springer Journals

Abscisic acid-regulated Glb1 transient expression in cultured maize P3377 cells

Plant Cell Reports, Volume 17 (8) – May 1, 1998

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Publisher
Springer Journals
Copyright
Copyright © 1998 by Springer-Verlag Berlin Heidelberg
Subject
Legacy
ISSN
0721-7714
eISSN
1432-203X
D.O.I.
10.1007/s002990050459
Publisher site
See Article on Publisher Site

Abstract

In a study of the 5′-flanking sequence of the Zea mays L. (maize) Glb1 gene in vitro, serial promoter deletions were generated and linked with the β -glucuronidase (GUS) reporter gene. The promoter deletion-GUS fusions were introduced into the maize P3377 cell line by particle bombardment. GUS assays indicated that treatment of the maize cultured cells with abscisic acid (ABA) was required for Glb1 -driven GUS transient expression, and that the –272-bp sequence of the Glb1 promoter was sufficient for ABA-regulated expression of GUS. The longest undeleted sequence used, –1391 GUS, showed relatively low expression which could be indicative of an upstream silencer element in the Glb1 promoter between –1391 and –805. Further studies show that the Glb1 -driven GUS activity of bombarded maize P3377 cells increases with increasing ABA concentration (up to 100–300 μ m ). Site-directed mutagenesis of a putative ABA response element, Em1a, abolished GUS expression in P3377 cells. This observation indicated that the Em1a sequence in the Glb1 5′ regulatory region is responsible for the positive ABA regulation of gene expression.

Journal

Plant Cell ReportsSpringer Journals

Published: May 1, 1998

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