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Gibberellin reactivates and maintains ovary-wall cell division causing fruit set in parthenocarpic Citrus species.
Mesejo, Carlos; Yuste, Roberto; Reig, Carmina; Martínez-Fuentes, Amparo; Iglesias, Domingo J; Muñoz-Fambuena, Natalia; Bermejo, Almudena; Germanà, M Antonietta; Primo-Millo, Eduardo; Agustí, Manuel.
Afiliación
  • Mesejo C; Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, Spain.
  • Yuste R; Dipartimento Scienze Agrarie e Forestali, Università degli Studi di Palermo, Italy.
  • Reig C; Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, Spain.
  • Martínez-Fuentes A; Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, Spain.
  • Iglesias DJ; Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, Spain.
  • Muñoz-Fambuena N; Dipartimento Scienze Agrarie e Forestali, Università degli Studi di Palermo, Italy.
  • Bermejo A; Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, Spain.
  • Germanà MA; Dipartimento Scienze Agrarie e Forestali, Università degli Studi di Palermo, Italy.
  • Primo-Millo E; Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, Spain.
  • Agustí M; Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, Spain. Electronic address: magusti@prv.upv.es.
Plant Sci ; 247: 13-24, 2016 Jun.
Article en En | MEDLINE | ID: mdl-27095396
Citrus is a wide genus in which most of the cultivated species and cultivars are natural parthenocarpic mutants or hybrids (i.e. orange, mandarin, tangerine, grapefruit). The autonomous increase in GA1 ovary concentration during anthesis was suggested as being the stimulus responsible for parthenocarpy in Citrus regardless of the species. To determine the exact GA-role in parthenocarpic fruit set, the following hypothesis was tested: GA triggers and maintains cell division in ovary walls causing fruit set. Obligate and facultative parthenocarpic Citrus species were used as a model system because obligate parthenocarpic Citrus sp (i.e. Citrus unshiu) have higher GA levels and better natural parthenocarpic fruit set compared to other facultative parthenocarpic Citrus (i.e. Citrus clementina). The autonomous activation of GA synthesis in C. unshiu ovary preceded cell division and CYCA1.1 up-regulation (a G2-stage cell cycle regulator) at anthesis setting a high proportion of fruits, whereas C. clementina lacked this GA-biosynthesis and CYCA1.1 up-regulation failing in fruit set. In situ hybridization experiments revealed a tissue-specific expression of GA20ox2 only in the dividing tissues of the pericarp. Furthermore, CYCA1.1 expression correlated endogenous GA1 content with GA3 treatment, which stimulated cell division and ovary growth, mostly in C. clementina. Instead, paclobutrazol (GA biosynthesis inhibitor) negated cell division and reduced fruit set. Results suggest that in parthenocarpic citrus the specific GA synthesis in the ovary walls at anthesis triggers cell division and, thus, the necessary ovary growth rate to set fruit.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Reguladores del Crecimiento de las Plantas / Citrus / Frutas / Giberelinas Idioma: En Revista: Plant Sci Año: 2016 Tipo del documento: Article País de afiliación: España Pais de publicación: Irlanda
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Reguladores del Crecimiento de las Plantas / Citrus / Frutas / Giberelinas Idioma: En Revista: Plant Sci Año: 2016 Tipo del documento: Article País de afiliación: España Pais de publicación: Irlanda