The Sexual-Hormonal Relation in Citrus During Fruit Set

Ali-Dinar, Hassan; Wheaton, T. A.; Krezdorn, A. H.

doi:10.17660/actahortic.1988.218.21

Cited by 7 publications

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“…Higher GA-like activity has been detected in fruits until 14 weeks after petal fall or the beginning of chlorophyll loss (García-Luis et al 1985 ;Ali-Dinar et al 1988 ;Murti 1989 ) . The lowest GA-like activity has been cited at maturity (Kuraoka et al 1977 ) .…”

Section: Hormones Associated To Fruit Colour Delaymentioning

confidence: 99%

Nutrient-Hormone Interactions in Citrus: Physiological Implications

Gravina

Gambetta

Rivas

2012

Advances in Citrus Nutrition

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Growth and development in woody perennial plants has many differences regarding to annual crops. After overcoming the juvenile stage, in which species are not able to produce fl owers, each annual cycle in perennials give rise to one or more fl ushes of vegetative and reproductive growth.Under tropical conditions, Citrus annually brings about several sprouting and blooms, whereas growing in temperate climates, only the spring fl ush is reproductive. In temperate zones, although several fl ushes of growth may occur, these are mostly vegetative. The exception is provided by lemon trees ( C . limon [L.] Burm.), which give rise to reproductive and vegetative shoots throughout the year.Vast information is available relating nutrition and water supply with fl owering and fruiting of Citrus . However, less information matching the controlling role of nutrients, carbohydrates, water and hormones during the developmental process is available. Therefore, hormonal and nutritional control of some Citrus developmental processes, with special emphasis on fl oral induction, fruit set, fruit development and maturation of Citrus has been focused in this chapter. AbstractCitrus growth and development is regulated by complex but subtly tuned nutritional and hormonal interaction in response to environmental signalling. Flower induction is stimulated by low temperatures and water stress and mediated by previous fruit load, being endogenous gibberellins (GAs) content pointed as the main inhibiting hormones. The promoting role of carbohydrates or nitrogen (N) on fl owering has not been demonstrated, but a minimum content of these compounds seems to be required for fl ower formation. Fruit set is a critical step for fruit production, being initially regulated by GAs content. Thereafter, during the onset of the source-sink competition, fruit set depends upon carbohydrates and N availability and fruitlets sink strength. During stage II of fruit development, fruit growth is promoted by auxins, carbohydrates and water accumulation. Afterwards, peel colour development, which is stimulated by low temperatures, is promoted by the decline of fl avedo's GAs content and the steady-state level of ethylene, as carbohydrates and abscisic acid (ABA) increase and N decrease during this fi nal stage.

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Section: Hormones Associated To Fruit Colour Delaymentioning

confidence: 99%

Nutrient-Hormone Interactions in Citrus: Physiological Implications

Gravina

Gambetta

Rivas

2012

Advances in Citrus Nutrition

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“…Hasta hoy, toda la información disponible está relacionada con la concentración endógena de GAs en la fase de floración y cuajado de frutos (Ali-Dinar et al, 1988;Talón et al, 1992). En trabajos en los que se estudió la actividad GAs, se ha señalado un incremento desde la antesis hasta 14-16 semanas después de la caída de pétalos (Hofman, 1990), o hasta el comienzo de la pérdida de clorofilas (García-Luis et al, 1985), y una disminución cuando el fruto está próximo a la madurez (Kuraoka et al, 1977).…”

Section: Discussionunclassified

“…En los frutos cítricos se ha citado que la mayor actividad tipo-GAs se da desde la antesis hasta, aproximadamente, 14 semanas después de la caída de pétalos, (Ali-Dinar et al, 1988;Hofman, 1990;Murti, 1989), o hasta el comienzo de la pérdida de clorofilas (García-Luis et al, 1985) y disminuye rápidamente cuando el fruto llega a la madurez (Kuraoka et al, 1977). Asimismo, se ha registrado mayor nivel de GAs en el flavedo y albedo de frutos con piel rugosa y coloración más verde (Erner et al, 1976), y mayor actividad de GAs en el flavedo que precede el reverdecimiento de la naranja 'Valencia' (Rasmussen, 1973).…”

Section: Evolución De Pigmentos En El Flavedo De Los Frutosunclassified

Control endógeno y exógeno de la maduración externa de los frutos cítricos

Romaso¹,

María²

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Expone:Que la presente Tesis Doctoral 'Control endógeno y exógeno de la maduración externa de los frutos cítricos', realizada por la Ingeniera Agrónoma Giuliana Gambetta Romaso para optar al grado de Doctora, se ha llevado a cabo bajo mi dirección en el Departamento de Producción Vegetal de la Universidad Politécnica de Valencia, y por la presente Autoriza:La presentación de la memoria adjunta a los efectos académicos oportunos.En Valencia, 9 de noviembre de 2009 Fdo. Manuel Agustí Fonfría A mis padres por transmitirnos el valor del conocimiento y enseñarnos a disfrutar del aprendizaje AgradecimientosA mis queridos profesores Manuel Agustí y Alfredo Gravina, con quienes aprendí que investigar no es solo cuestionar, estudiar, descubrir, aprender, transmitir,…. es una forma de vivir. A Manolo quiero agradecer todo el apoyo brindado para que fuera posible la realización de esta tesis; su invalorable contribución en lo académico y, fundamentalmente, su sensibilidad, afecto y amistad. A Alfredo, mi profesor y amigo, por impulsarme siempre hacia el crecimiento profesional, por su apoyo incondicional y por el tiempo que me ha dedicado durante todos estos años.A mis queridos amigos Ampa, Carmina y Carlos, con quienes he aprendido, disfrutando horas de campo, laboratorio y oficina en España y Uruguay. A los tres muchas gracias por su permanente colaboración, solidaridad y cariño.A todas las personas que han transitado por el laboratorio de citricultura de la UPV, y que de alguna manera han colaborado con este trabajo: Gema, Gracia, Bartolomé, Vicent, Sandra, Diego, Enri, Peter, Carmela, Mariano y Vicente.A mis queridos amigos del grupo de ecofisiología de citrus de Uruguay por las horas de campo y laboratorio compartidas durante esta tesis: al inicio con Ale, Mariana, Elisa, Mariela, y al final con Xime, Ceci, Caro, Cristian y Seba, a todos gracias por hacer el trabajo más ameno, por las largas charlas y…. por estar siempre.A Tito, Lucía, Gabriela, Tato, Vivian, Joanna, Matías y Valentina de Uruguay, por la colaboración recibida en distintas etapas de esta tesis.A Jaime Cebolla y Ana Pérez del Instituto Universitario de Conservación y Mejora de la Agrodiversidad Valenciana de la UPV (España), por su apoyo durante el uso del lector de placas.Al grupo del laboratorio de Bioquímica de la Facultad de Agronomía, Uruguay, en especial a los profesores Omar Borsani, Pedro Díaz, Pilar Irisarri y Mariana Sotelo, por su importante contribución y por poner el laboratorio a disposición. A Mercedes Peyrou e Inés Ponce de León, del Instituto de InvestigacionesBiológicas Clemente Estable (Uruguay), por facilitarme el laboratorio.A la Dra. Laura García de la Facultad de Ciencias y al Ing.Agr. Enrique Verdier (MGAP) de Uruguay, por su excelente disposición con el liofilizado de las muestras. Al Departamento de Biometría, Estadística y Computación de la Facultad deAgronomía, Uruguay, en especial a Oscar Bentancur por los análisis estadísticos y a Alejandra Borges por el asesoramiento en el diseño de los experimentos.A la Dra Virginia Luna ...

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Hormonal Profile in Ovaries of Mandarin Varieties with Differing Reproductive Behaviour

Bermejo

Primo‐Millo

Agustí

et al. 2015

J Plant Growth Regul

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The endogenous levels of 13 gibberellins (GAs), three cytokinins (CKs), abscisic acid (ABA), indole-3-acetic acid (IAA) and jasmonic acid (JA) were analyzed in naturally pollinated ovaries of three mandarin cultivars selected for their different capacity to produce seeds and their differing parthenocarpic ability. The varieties compared were Murcott (pollen self-compatible, highly seeded), Moncada (self-incompatible, moderately seeded), and Moncalina (pollen sterile, seedless), obtained from Moncada by bud c-irradiation. As expected, the 13-hydroxylation pathway was predominant in ovaries and our results further indicate that cultivar differences exist in GA metabolism. The active gibberellin GA 1 levels in ovaries seems to be related with presence of fertilized ovules and, therefore, with the ability to produce the seeds of a variety. Sterility gamma irradiation arrested the biosynthesis of GA 1 and its precursor GA 19 in Moncalina ovaries if compared to Moncada. The productive efficiency of the studied cultivars also indicated that fruit set depends strongly on the GA 1 level achieved by ovaries, which is also closely related with carbohydrate content. The study of the expression of gibberellin-oxidase genes showed that the pollination/fecundation process enhances GA20ox2 and GA3ox1 activities in naturally pollinated Murcott and Moncada ovaries compared with unpollinated Murcott and Moncalina, respectively. GA2ox1 expression was lower in the ovaries of the highly seeded cultivar Murcott than in those of Moncada or Moncalina. Unpollinated Murcott ovaries contained much lower levels of GA 1 and IAA than the naturally pollinated ovaries of this cultivar. Conversely, unpollinated ovaries, which exhibited 100 % abscission, had more ABA and JA contents. Cytokinin activity seemed constitutive and independent of pollination/fecundation. However, trans-zeatin (t-Z) and 2-isopentenyl adenine (2-IP) concentrations were higher in Murcott ovaries than in Moncada/Moncalina.

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The Sexual-Hormonal Relation in Citrus During Fruit Set

Cited by 7 publications

References 0 publications

Nutrient-Hormone Interactions in Citrus: Physiological Implications

Nutrient-Hormone Interactions in Citrus: Physiological Implications

Control endógeno y exógeno de la maduración externa de los frutos cítricos

Hormonal Profile in Ovaries of Mandarin Varieties with Differing Reproductive Behaviour

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