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Sugar-dependent alterations in cotyledon and leaf development in transgenic plants expressing the HDZhdip gene ATHB13
Department of Physiological Botany, Evolutionary Biology Center, Uppsala University, Uppsala, Sweden.ORCID iD: 0000-0002-5605-7984
Department of Physiological Botany, Evolutionary Biology Center, Uppsala University, Uppsala, Sweden.
Department of Physiological Botany, Evolutionary Biology Center, Uppsala University, Uppsala, Sweden.
2001 (English)In: Plant Molecular Biology, ISSN 0167-4412, E-ISSN 1573-5028, Vol. 45, no 3, 247-262 p.Article in journal (Refereed) Published
Abstract [en]

ATHB13 is a new member of the homeodomain leucine zipper (HDZip) transcription factor family of Arabidopsis thaliana. Constitutive high-level expression of the ATHB13 cDNA in transgenic plants results in altered development of cotyledons and leaves, specifically in plants grown on media containing metabolizable sugars. Cotyledons and leaves of sugar-grown transgenic plants are more narrow and the junction between the petiole and the leaf blade less distinct, as compared to the wild type. High-level expression of ATHB13 affects cotyledon shape by inhibiting lateral expansion of epidermal cells in sugar-treated seedlings. Experiments with non-metabolizable sugars indicate that the alteration in leaf shape in the ATHB13 transgenics is mediated by sucrose sensing. ATHB13 further affects a subset of the gene expression responses of the wild-type plant to sugars. The expression of genes encoding beta-amylase and vegetative storage protein is induced to higher levels in response to sucrose in the transgenic plants as compared to the wild type. The expression of other sugar-regulated genes examined is unaffected by ATHB13. These data suggest that ATHB13 may be a component of the sucrose-signalling pathway, active close to the targets of the signal transduction.

Place, publisher, year, edition, pages
Kluwer Academic Publishers, 2001. Vol. 45, no 3, 247-262 p.
Keyword [en]
Arabidopsis thaliana, homeobox, HDZip transcription factor, over-expression, sugar sensing, transgenic plant
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:umu:diva-114414DOI: 10.1023/A:1006464907710PubMedID: 11292072OAI: oai:DiVA.org:umu-114414DiVA: diva2:895314
Note

This work was supported by the Swedish Council for Forestry and Agricultural Research and by the Foundation for Strategic Research.

Available from: 2016-01-18 Created: 2016-01-18 Last updated: 2016-02-25Bibliographically approved

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