PMID: 11903976Mar 21, 2002Paper

Catalase gene expression in response to auxin-mediated developmental signals

Physiologia Plantarum
Lingqiang M Guan, John G Scandalios

Abstract

The effect of auxin on maize catalase gene expression was examined at several different developmental stages during embryo and seedling development. All three catalase genes and their respective proteins were induced by both natural and synthetic auxin in immature embryos. Total catalase (CAT) activity increased dramatically in response to high concentrations of auxin, with CAT-2, which is not normally expressed at this stage, being the isozyme most responsible for the increase. Cat1 transcript accumulated to high levels at 2-8 h after auxin treatment, while Cat2 and Cat3 transcripts increased dramatically, but only after 12 h. In CAT-2 null mutant lines, the CAT-1 isozyme compensated for the missing CAT-2 activity and was the major isozyme responsible for the observed increase in total CAT activity. Auxin treatment mimics the germination process (i.e. induces germination) in immature embryos. Thus, the observed early induction of CAT-1 and the later increase of CAT-2 during the germination process may be due, in part, to changes in auxin content. In germinating embryos, auxin also induces total CAT activity and Cat transcript accumulation, although to a lesser extent. Auxin also induces Cat1 transcript accumulation in young le...Continue Reading

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Citations

Nov 20, 2008·Journal of Integrative Plant Biology·Yan-Yan DuChun-Peng Song
Mar 30, 2011·Plant, Cell & Environment·Vanesa B TognettiFrank Van Breusegem
Nov 26, 2015·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Shawn W Gibson, Christopher D Todd
Apr 4, 2013·GM Crops & Food·Lamiaa F El-GaiedNahla A El-Sherif
Jul 23, 2016·Molecular Plant-microbe Interactions : MPMI·Gholamreza KhaksarPaitip Thiravetyan
Feb 23, 2007·Journal of Experimental Botany·Photini V MylonaJohn G Scandalios

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