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Downregulation of the Basic Peroxidase Isoenzyme from Zinnia elegans by Gibberellic Acid
Article first published online: 10 FEB 2010
DOI: 10.1111/j.1744-7909.2010.00888.x
© 2010 Institute of Botany, Chinese Academy of Sciences
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How to Cite
López Núñez-Flores, M. J., Gutiérrez, J., Gómez-Ros, L. V., Novo Uzal, E., Sottomayor, M. and Ros Barceló, A. (2010), Downregulation of the Basic Peroxidase Isoenzyme from Zinnia elegans by Gibberellic Acid. Journal of Integrative Plant Biology, 52: 244–251. doi: 10.1111/j.1744-7909.2010.00888.x
Publication History
- Issue published online: 10 FEB 2010
- Article first published online: 10 FEB 2010
- Received 27 Aug. 2009 Accepted 11 Sept. 2009
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Abstract
Hypocotyl formation during the epigeal germination of seedlings is under strict hormonal regulation. In a 3 d old Zinnia elegans seedling system, gibberellic acid (GA3) exerts an opposite effect to that exerted by light on hypocotyl photomorphogenesis because GA3 promotes an etiolated-like growth with an inhibition of radial (secondary) growth. For this reason, the effect of GA3 on the basic peroxidase isoenzyme from Z. elegans (ZePrx), an enzyme involved in hypocotyl lignin biosynthesis, was studied. The results showed that GA3 reduces ZePrx activity, similarly to the way in which it reduces seedling secondary growth. This hormonal response is supported by the analysis of the ZePrx promoter, which contains four types of GA3-responsive cis-elements: the W Box/O2S; the Pyr Box; the GARE; and the Amy Box. Taken together, these results suggest that ZePrx is directly regulated by GA3, with this effect matching the inhibitory effect of GA on the hypocotyl secondary growth.