ArticlePlant physiology2010
G-Box binding factor1 reduces CATALASE2 expression and regulates the onset of leaf senescence in Arabidopsis.
Article in Plant physiology, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It has been retracted, and should not be counted. Cited by 47 papers.
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47 citing papers in PubMed, 110 citations in OpenAlex.
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- Article
Corrections and comments
- Correction · 2016-01-30Error in Data · Error in Image · Error in Text · Updated to Retraction ·
- Retraction · 2017-04-01Concerns/Issues about Image · Error in Data · Error in Image · Error in Methods · Error in Results and/or Conclusions · Unreliable Results and/or Conclusions · Upgrade/Update of Prior Notice(s) ·
- Erratum issued
- Retracted
Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Hydrogen peroxide (H(2)O(2)) is discussed as being a signaling molecule in Arabidopsis (Arabidopsis thaliana) leaf senescence. Intracellular H(2)O(2) levels are controlled by the H(2)O(2)-scavenging enzyme catalase in concert with other scavenging and producing systems. Catalases are encoded by a small gene family, and the expression of all three Arabidopsis catalase genes is regulated in a senescence-associated manner. CATALASE2 (CAT2) expression is down-regulated during bolting time at the onset of leaf senescence and appears to be involved in the elevation of the H(2)O(2) level at this time point. To understand the role of CAT2 in senescence regulation in more detail, we used CAT2 promoter fragments in a yeast one-hybrid screen to isolate upstream regulatory factors. Among others, we could identify G-Box Binding Factor1 (GBF1) as a DNA-binding protein of the CAT2 promoter. Transient overexpression of GBF1 together with a CAT2:beta-glucuronidase construct in tobacco (Nicotiana benthamiana) plants and Arabidopsis protoplasts revealed a negative effect of GBF1 on CAT2 expression. In gbf1 mutant plants, the CAT2 decrease in expression and activity at bolting time and the increase in H(2)O(2) could no longer be observed. Consequently, the onset of leaf senescence and the expression of senescence-associated genes were delayed in gbf1 plants, clearly indicating a regulatory function of GBF1 in leaf senescence, most likely via regulation of the intracellular H(2)O(2) content.
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