Downregulation of the Basic Peroxidase Isoenzyme fromZinnia elegansby Gibberellic Acid
| Autor: | Mariana Sottomayor, María Josefa López Núñez-Flores, Jorge Gutiérrez, Alfonso Ros Barceló, Esther Novo Uzal, Laura V. Gómez-Ros |
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| Rok vydání: | 2010 |
| Předmět: |
Epigeal germination
biology fungi food and beverages Zinnia elegans Plant Science Asteraceae biology.organism_classification Biochemistry Gibberellins General Biochemistry Genetics and Molecular Biology Hypocotyl Isoenzymes chemistry.chemical_compound chemistry Gene Expression Regulation Plant Seedlings Seedling Etiolation Gibberellin Photomorphogenesis Gibberellic acid Peroxidase |
| Zdroj: | Journal of Integrative Plant Biology. 52:244-251 |
| ISSN: | 1744-7909 1672-9072 |
| DOI: | 10.1111/j.1744-7909.2010.00888.x |
| Popis: | Hypocotyl formation during the epigeal germination of seedlings is under strict hormonal regulation. In a 3 d old Zinnia elegans seedling system, gibberellic acid (GA(3)) exerts an opposite effect to that exerted by light on hypocotyl photomorphogenesis because GA(3) promotes an etiolated-like growth with an inhibition of radial (secondary) growth. For this reason, the effect of GA(3) on the basic peroxidase isoenzyme from Z. elegans (ZePrx), an enzyme involved in hypocotyl lignin biosynthesis, was studied. The results showed that GA(3) 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 GA(3)-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 GA(3), with this effect matching the inhibitory effect of GA on the hypocotyl secondary growth. |
| Databáze: | OpenAIRE |
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