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Titre du document / Document title

Light regulation of gibberellin biosynthesis and mode of action

Auteur(s) / Author(s)

GARCIA-MARTINEZ José Luis (1) ; GIL Joan (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia-CSIC, Avda de los Naranjos s/n, 46022-Valencia, ESPAGNE

Résumé / Abstract

Some phenotypic effects produced in plants by light are very similar to those induced by hormones. In this review, the light-gibberellin (GA) interaction in germination, de-etiolation, stem growth, and tuber formation (processes regulated by GAs) are discussed. Germination of lettuce and Arabidopsis seeds depends on red irradiation (R), which enhances the expression of GA 3-oxidase genes (GA3ox) and leads to an increase in active GA content. De-etiolation of pea seedling alters the expression of GA20ox and GA3ox genes and induces a rapid decrease of GA1 content. Stem growth of green plants is also affected by diverse light irradiation characteristics. Low light intensity increases stem elongation and active GA content in pea and Brassica. Photoperiod controls active GA levels in long-day rosette (spinach and Silene) and in woody plants (Salix and hybrid aspen) by regulating different steps of GA biosynthesis, mainly through transcript levels of GA20ox and GA3ox genes. Light modulation of stem elongation in light-grown plants is controlled by phytochrome, which modifies GA biosynthesis and catabolism (tobacco, potato, cowpea, Arabidopsis) and GA-response (pea, cucumber, Arabidopsis). In Arabidopsis and tobacco, ATH1 (a gene encoding an homeotic transcription factor) is a positive mediator of a phyB-specific signal transduction cascade controlling GA levels by regulating the expression of GA20ox and GA3ox. Tuber formation in potato is controlled by photoperiod (through phyB) and GAs. Inductive short-day conditions alter the diurnal rhythm of GA20ox transcript abundance, and increases the expression of a new protein (PHOR1) that plays a role in the photoperiod-GA interaction.

Revue / Journal Title

Journal of plant growth regulation    ISSN  0721-7595   CODEN JPGRDI 

Source / Source

2001, vol. 20, no 4 (127 p.)  (3 p.1/4), pp. 354-368

Langue / Language

Anglais

Editeur / Publisher

Springer, New York, NY, ETATS-UNIS  (1982) (Revue)

Mots-clés anglais / English Keywords

Plant growth substance

;

Phytochrome

;

Signal transduction

;

Photoperiod

;

Vegetals

;

Review

;

Growth

;

Mechanism of action

;

Light

;

Regulation(control)

;

Metabolism

;

Gibberellin

;

Mots-clés français / French Keywords

Substance croissance végétal

;

Phytochrome

;

Transduction signal

;

Photopériode

;

Végétal

;

Article synthèse

;

Croissance

;

Mécanisme action

;

Lumière

;

Régulation

;

Métabolisme

;

Gibbérelline

;

Mots-clés espagnols / Spanish Keywords

Substancia crecimiento vegetal

;

Fitocromo

;

Transducción señal

;

Fotoperíodo

;

Vegetal

;

Artículo síntesis

;

Crecimiento

;

Mecanismo acción

;

Luz

;

Regulación

;

Metabolismo

;

Giberelina

;

Localisation / Location

INIST-CNRS, Cote INIST : 19223, 35400010135185.0040

Nº notice refdoc (ud4) : 13678406



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