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The promoter of the nematode resistance gene Hs1pro-1 activates a nematode-responsive and feeding site-specific gene expression in sugar beet (Beta vulgaris L.) and Arabidopsis thaliana

The promoter of the nematode resistance gene Hs1pro-1 activates a nematode-responsive and feeding site-specific gene expression in sugar beet (Beta vulgaris L.) and Arabidopsis thaliana

Plant Molecular Biology 52(3): 643-660

The Hs1(pro-1) gene confers resistance to the beet cyst nematode Heterodera schachtii in sugar beet (Beta vulgaris L.) on the basis of a gene-for-gene relationship. RNA-gel blot analysis revealed that the transcript of Hs1(pro-1) was present in uninfected roots of resistant beet at low levels but increased by about fourfold one day after nematode infection. Treatments of plants with external stimuli including salicylic acid, jasmonic acid, gibberellic acid and abscisic acid as well as wounding or salt stress did not result in changes in the gene transcription, indicating de novo transcription of Hs1(pro-1) upon nematode infection specifically. To study transcriptional regulation of Hs1(pro-1) expression at the cellular level, a 3082 bp genomic fragment representing the Hs1(pro-1) promoter, isolated from the YAC-DNA housing the Hs1(pro-1) gene, was fused to the beta-glucuronidase reporter gene (1832prm1::GUS) and transformed into susceptible beet roots and Arabidopsis plants, respectively. Fluorometric and histochemical GUS assays on transgenic beet roots and Arabidopsis plants carrying the 1832prm1::GUS construct demonstrated that the Hs1(pro1) promoter is functional in both species and drives a nematode responsive and feeding site-specific GUS-expression. GUS activity was detected as early as at initiation of the nematode feeding sites and GUS staining was restricted to the nematode feeding sites. To delineate the regulatory domains of the Hs1(pro-1) promoter, fusion genes with various 5' deletions of the Hs1(pro-1) promoter and the GUS gene were constructed and analysed in transgenic beet roots as well. Cis elements responsible for feeding site-specific gene expression reside between -355 and +247 from the transcriptional initiation site of Hs1(pro-1) whereas an enhancer region necessary for higher gene expression is located between -1199 and -705 of the promoter. The Hs1(pro-1) promoter drives a nematode feeding site-specific GUS expression in both sugar beet and Arabidopsis suggesting a conserved mechanism of regulation of Hs1(pro-1) expression in these two species.

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Accession: 003980665

Download citation: RISBibTeXText

PMID: 12956533

DOI: 10.1023/a:1024887516581

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