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Extension-growth responses and expression of flavonoid biosynthesis genes in the Arabidopsis hy4 mutant

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Abstract

The hy4 mutant of Arabidopsis thaliana(L.) Heynh. was previously shown to be impaired in the suppression of hypocotyl extension specifically by blue light. We report here that hy4 is altered in a range of blue-light-mediated extension-growth responses in various organs in seedlings and mature plants: it shows greater length of bolted stems, increased petiole extension and increased leaf width and area in blue light compared to the wild type. The hy4 mutant shows decreased cotyledon expansion in both red and blue light compared to the wild type. Anthocyanin formation and the expression of several flavonoid biosynthesis genes is stimulated by blue light in the wild type but to a much lower extent in hy4. The results indicate that the HY4 gene product is concerned with the perception of blue light in a range of extension-growth and gene-expression responses in Arabidopsis.

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Abbreviations

DFR:

dihydroflavonol reductase

CHS:

chalcone synthase

CHI:

chalcone isomerase

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Authors and Affiliations

  1. Plant Molecular Science Group, Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, Bower Building, University of Glasgow, G12 8QQ, Glasgow, UK

    Jennie A. Jackson & Gareth I. Jenkins

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  1. Jennie A. Jackson
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  2. Gareth I. Jenkins
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Additional information

We thank the UK Agricultural and Food Research Council for supporting this work through the award of a research grant to G.I.J. We are grateful to Robert Brown for excellent technical assistance and Drs B.W. Shirley (Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, USA), C.D. Silflow (Department of Genetics and Cell Biology, University of Minnesota, St. Paul, USA) and I.E. Somssich (Department of Biochemistry, Max-Planck-Institut, Köln, Germany) for providing plasmid DNA.

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Jackson, J.A., Jenkins, G.I. Extension-growth responses and expression of flavonoid biosynthesis genes in the Arabidopsis hy4 mutant. Planta 197, 233–239 (1995). https://doi.org/10.1007/BF00202642

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