Downregulation of the Basic Peroxidase Isoenzyme from Zinnia elegans by Gibberellic Acid

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Mari Josefa L Lopez Nunez Flores (Author) Other; Jorge Gutierrez (Author) Other; Laura V Gomez Ros (Author) Other; Esther Novo Uzal (Author) Other; Mariana Sottomayor (Author) FCUP; Alfonso Ros Barcelo (Author) Other

Journal

Title: Journal of Integrative Plant Biology

Vol. 52

Pages: 244-251

ISSN: 1672-9072

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 12 Citations

Scientific classification

FOS: Natural sciences > Biological sciences

Other information

Authenticus ID: P-003-9FE

DOI: 10.1111/j.1744-7909.2010.00888.x

Abstract (EN): 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 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 GA3, with this effect matching the inhibitory effect of GA on the hypocotyl secondary growth.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8