English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/23863
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Citado 38 veces en Web of Knowledge®  |  Pub MebCentral Ver citas en PubMed Central  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL

Inhibition of Auxin Transport from the Ovary or from the Apical Shoot Induces Parthenocarpic Fruit-Set in Tomato Mediated by Gibberellins

AutorSerrani, Juan Carlos; Carrera, Esther; Ruiz-Rivero, Omar; Gallego-Giraldo, Lina; García-Martínez, José-Luis; Pereira Peres, Lázaro Eustaquio
Palabras claveAuxinas
Fecha de publicación13-abr-2010
EditorAmerican Society of Plant Biologists
CitaciónPlant Physiology 153: 851-62 (2010)
ResumenFruit-set in tomato (Solanum lycopersicum L.) depends on gibberellins and auxin (GAs). Here we show, using the cv MicroTom, that application of N-1- naphthylphthalamic acid (NPA) (an inhibitor of auxin transport) to unpollinated ovaries induced parthenocarpic fruit-set, associated with an increase of indole-3-acetic acid (IAA) content, and that this effect was negated by paclobutrazol (PAC; an inhibitor of GA biosynthesis). NPA-induced ovaries contained higher content of GA1 (an active GA) and transcripts of GA biosynthetic genes (SlCPS, SlGA20ox1 and -2). Interestingly, application of NPA to pollinated ovaries prevented their growth, potentially due to supraoptimal IAA accumulation. Plant decapitation, and inhibition of auxin transport by NPA from the apical shoot, also induced parthenocarpic fruit growth of unpollinated ovaries. Application of IAA to the severed stump negated the plant decapitation effect, indicating that the apical shoot prevents unpollinated ovary growth through IAA transport. Parthenocarpic fruit growth induced by plant decapitation was associated with high levels of GA1 and was counteracted by PAC treatment. Plant decapitation also produced changes in transcript levels of genes encoding enzymes of GA biosynthesis (SlCPS and SlGA20ox1) in the ovary, quite similar to those found in NPA-induced fruits. All these results suggest that auxin can have opposing effects on fruit-set, either inducing (when accumulated in the ovary) or repressing (when transported from the apical shoot) that process, and that GAs act as mediators in both cases. The effect of NPA application and decapitation on fruit-set induction was also observed in MicroTom lines bearing introgressed D (DWARF) and Sp (SELT23 PRUNING) wild type alleles.
Versión del editorhttp://dx.doi.org/10.1104/pp.110.155424
Aparece en las colecciones: (IBMCP) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.