Stress responses in alfalfa (Medicago sativa L.). 8. Cis-elements and trans-acting factors for the quantitative expression of a bean chalcone synthase gene promoter in electroporated alfalfa protoplasts.

Abstract:

:A chimeric gene consisting of a bean (Phaseolus vulgaris L.) chalcone synthase (CHS) promoter fused to a bacterial chloramphenicol acetyltransferase (CAT) reporter gene was strongly expressed, and further induced by fungal elicitor, when electroporated into alfalfa (Medicago sativa L.) suspension cell protoplasts. Functional analysis of 5' deletions of the CHS promoter-CAT construct in these protoplasts indicated that the region between -326 and -130 contained both activator and silencer elements. Co-electroporation experiments confirmed that these cis-acting elements were binding sites for functionally active trans factors. In vitro DNase I footprinting revealed four potential binding sites for alfalfa suspension cell nuclear proteins between positions -326 and -130 of the CHS promoter. These sites mapped to regions shown to contain functional cis-acting elements on the basis of the deletion analysis. Three of these sites mapped to previously identified binding sites for bean nuclear proteins. Competition gel retardation analysis using oligonucleotide probes containing binding site sequences revealed sequence-specific binding of alfalfa nuclear proteins to an AT-rich element and a putative GT-1 factor consensus binding sequence. Our results define cis elements and their cognate trans factors functionally active in determining the quantitative expression of a defense response gene in a heterologous transient expression system.

journal_name

Plant Mol Biol

journal_title

Plant molecular biology

authors

Harrison MJ,Choudhary AD,Dubery I,Lamb CJ,Dixon RA

doi

10.1007/BF00015079

subject

Has Abstract

pub_date

1991-05-01 00:00:00

pages

877-90

issue

5

eissn

0167-4412

issn

1573-5028

journal_volume

16

pub_type

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