Transgenic arabidopsis plants were isolated that contained a T-DNA construct in which the promoter of an auxin-inducible glutathione S-transferase (GST) gene from tobacco was fused to the kanamycin resistance (nptII) as well as to the β-glucuronidase (gusA) reporter gene. Subsequently, seeds were treated with EMS to obtain mutants in which both reporter gene fusions were up-regulated. Northern analysis showed that the mRNA level of a related, endogenous auxin-inducible GST gene of Arabidopsis was increased in some of these mutants as well. Two of the gup (GST up-regulated) mutants were characterized in more detail and roughly mapped. Both had epinastic cotyledons and leaves, a phenotype that turned out to be linked to the gup mutation.
Plant Molecular Biology – Springer Journals
Published: Oct 19, 2004
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