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A PAL1 Gene Promoter–Green Fluorescent Protein Reporter System to Analyse Defence Responses in Live Cells of Arabidopsis thaliana

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Abstract

Arabidopsis thaliana ecotype Columbia-0 was transformed with a green fluorescent protein (GFP) gene under control of a phenylalanine ammonia-lyase (PAL) promoter. PAL is a key enzyme of the phenylpropanoid pathway and is induced to high levels during plant stress. Constitutive expression of PAL1 promoter-controlled GFP occurred in vascular tissues within stems, leaves and roots and in developing flowers. PAL1 promoter–GFP expression was examined in leaves of transgenic plants subjected to an abiotic elicitor, mechanical wounding or to inoculation with the pathogens Pseudomonas syringae pv. tomato or Peronospora parasitica. Wounding of leaves and treatment with an abiotic elicitor and compatible interactions produced low to moderate levels of GFP. However, in incompatible interactions there were high levels of GFP produced. In incompatible interactions, the intensity of GFP fluorescence was similar to that produced in transgenic plants expressing GFP driven by the CaMV promoter. The bright green fluorescence produced in live cells and tissues was readily visualised using conventional fluorescence microscopy and was quantified using spectroflourometry. This is the first report of the use of GFP as a reporter of defence gene activation against pathogens. It has several advantages over other reporter genes including real time analysis of gene expression and visualisation of defence gene activation in a non-invasive manner.

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Authors and Affiliations

  1. School of Biological and Chemical Sciences, Deakin University, Geelong, Victoria, 3217, Australia

    James E. Rookes & David M. Cahill

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  1. James E. Rookes
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  2. David M. Cahill
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Correspondence to David M. Cahill.

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Rookes, J.E., Cahill, D.M. A PAL1 Gene Promoter–Green Fluorescent Protein Reporter System to Analyse Defence Responses in Live Cells of Arabidopsis thaliana . European Journal of Plant Pathology 109, 83–94 (2003). https://doi.org/10.1023/A:1022062904989

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