Effects of sucrose supply on growth and paraquat tolerance of the late-flowering gi-3 mutant

Jasmina Kurepa, Jan Smalle, Marc Van Montagu, Dirk Inzé

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17 Scopus citations


Mutations at the GI locus in Arabidopsis are pleiotropic: gi mutants are late-flowering, tolerant to the toxicity of the herbicide paraquat, and have an increased starch content. We tested the effects of exogenous sucrose supply on the level of paraquat tolerance and on growth and development of the gi-3 mutant. Paraquat tolerance was the highest in gi-3 seedlings grown on medium containing 1% sucrose. As expected, all measured growth parameters (root length, fresh weight, anthocyanin, and sucrose content) were influenced by the sucrose dose, but in a number of assays (effect on fresh weight and developmental characteristics) the sucrose-dependent response in gi-3 was heterochronic. Additionally, the late-flowering phenotype of the gi-3 mutant was reverted to wild type after prolonged growth in darkness on sucrose-containing media.

Original languageEnglish
Pages (from-to)91-96
Number of pages6
JournalPlant Growth Regulation
Issue number2
StatePublished - 1998

Bibliographical note

Funding Information:
This work was supported by grants from the Belgian Programme on Interuniversity Poles of Attraction (Prime Minister’s Office, Science Policy Programming, No. 38), the Vlaams Actieprogramma Biotech-nologie (ETC 002), the International Human Frontier Science Program (IHFSP RG-434/94M), and the European Union (INTAS 94-774). D.I. is a Research Director of the Institut National de la Recherche Agronomique (France).


  • Arabidopsis
  • Flowering time
  • GI locus
  • Paraquat tolerance
  • Sucrose

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science


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