Agronomía: Recent submissions
Now showing items 21-40 of 403
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Ultraestructura del bambú Guadua angustifolia var. bicolor (Poaceae: Bambusoideae), presente en Costa Rica
(2006-08-20)Sections of leaf lamina, leaf sheath and branches of adult Guadua paniculata collected in Costa Rica, were studied ultrastructurally. Diagnostic ultrastructural characteristics include the cellular pattern of the adaxial ... -
Micropropagación de Guadua angustifolia Kunth a partir de explantes nodales
(2004)Se evaluó el efecto de diferentes estrategias de desinfección, así como de varias concentraciones de la citoquinina 6-bencilamino purina (BAP) en el medio de cultivo, sobre el establecimiento y desarrollo in vitro de ... -
Effect of hydrogen cyanamide on the endogenous hormonal content of pea seedlings (Pisum sativum L.)
(2008)Hydrogen cyanamide (HC) has been used to break bud and seed dormancy and to improve rooting in several species, responses usually associated with the action of plant hormones. However, very few studies have measured ... -
Comparative Epidemiology of Citrus tristeza virus in Plantings of Various Citrus Species in Costa Rica, and Long Distance Spread by the Brown Citrus Aphid
(2002)Five 400-tree plots were established to compare the virus increase and spread of Citrus tristeza virus (CTV) among grapefruit, orange and lemon plots in San Carlos and Nicoya citrus producing areas of Costa Rica. Tree ... -
Changes in hormone concentrations during dormancy release of oil palm (Elaeis guineensis) seeds
(2008-10)Oil palm (Elaeis guineensis) seeds are highly dormant immediately after harvest. In practical horticulture this dormancy has been traditionally overcome by a dry-heat treatment and, more recently, through the application ... -
Floración in vitro - revisión de literatura
(2009-01)La floración in vitro puede ser inducida en diferentes estadios durante el desarrollo de las plantas in vitro mediante variaciones en los factores físicos y químicos relacionados con el cultivo de tejidos. Dentro de los ... -
Mode of action of plant hormones and plant growth regulators during induction of somatic embryogenesis: molecular aspects
(2005-11)Plant hormones play critical roles in the establishment of somatic embryogenesis. During this process, somatic plant cells reverse their state of differentiation, acquire pluripotentiality and set up a new developmental ... -
Participation of plant hormones in determination and progression of somatic embryogenesis
(2005-11)In vitro culture protocols have been developed for many species, mainly using empirical approaches, to induce somatic embryogenesis from various explant types. However, the underlying biochemical mechanisms governing ... -
Involvement of Plant Hormones and Plant Growth Regulators on in vitro Somatic Embryogenesis
(2005-11)In spite of the importance attained by somatic embryogenesis and of the many studies that have been conducted on this developmental process, there are still many aspects that are not fully understood. Among those features, ... -
Evolution of endogenous hormone concentration in embryogenic cultures of carrot during early expression of somatic embryogenesis
(2004-09)Embryogenic callus and suspension cultures of carrot (Daucus carota L., cv. Nantaise), growing on/in medium including 1 mg/l 2,4-dichlorophenoxy acetic acid (2,4-D), were transferred to medium with or without this plant ... -
Regulation of in vitro somatic embryogenesis with emphasis on to the role of endogenous hormones
(2001)Different aspects of the in vitro somatic embryogenesis regulation are reviewed in this paper.work. A description of g General aspects, such as terminology, uses, stages of development and factors associated with the somatic ... -
Endogenous hormone concentrations and embryogenic callus development in wheat
(2001-10)Immature zygotic embryos of two wheat (Triticum aestivum L.) genotypes, known for their different ability to generate embryogenic callus, were used as initial explants to establish callus cultures. Embryogenic and ... -
In vitro culture and endogenous hormone levels in immature zygotic embryos, endosperm and callus cultures of normal and high-lysine barley genotypes
(2001)Endogenous hormone levels viz. indole-3-acetic acid (IAA), abscisic acid, gibberellins 1, 3 and 20 (GAs), zcatin/zeatin riboside and N6(Δ2-isopentenyl) adenine/ N6(Δ2-i sopentenyl) adenosine were determined in immature ... -
Endogenous hormone levels in habituated nucellar Citrus callus during the initial stages of regeneration
(2001-01)Embryogenic nucellar callus cultures of different Citrus species and cultivars growing in hormone-free medium were transferred to medium containing either sucrose or glycerol as the only carbohydrate source. Glycerol has ... -
Caracterización anatómica ultraestructural de las variantes “Atlántica”, “Sur” y “Cebolla” del bambú, Guadua angustifolia (Poaceae: Bambusoideae), en Costa Rica
(2006-08-20)We present an ultrastructural characterization of three variants or “forms” of Guadua angustifolia and of the closely related Guadua sp., from Costa Rican populations. Their ultrastructure is similar. Differences are: ... -
In vitro propagation of the neotropical giant bamboo, Guadua angustifolia Kunth, through axillary shoot proliferation
(2006)Guadua angustifolia Kunth was successfully propagated in vitro from axillary buds. Culture initiation, bud sprouting, shoot and plant multiplication, rooting and acclimatization, were evaluated. Best results were obtained ... -
Identificación y selección de híbridos somáticos obtenidos mediantefusión de protoplastos
(2009)El poder seleccionar eficientemente las plantas híbridas producidas a partir de fusión de protoplastos es fundamental. Se han logrado muchos avances en el tema en las últimas décadas. Entre los métodos utilizados para la ... -
Fatty acids and triacylglycerols in the mesocarp and kernel oils of maturing Costa Rican Acrocomia aculeata fruits
(2019-03)Total lipids, fatty acids, and triacylglycerols in mesocarp and kernels from Costa Rican Acrocomia aculeata fruits were characterized at three maturity stages. C16:0 and C18:1n9 were the most abundant fatty acids in the ... -
Endogenous hormone levels in explants and in embryogenic and non-embryogenic cultures of carrot
(2001)Carrot (Daucus carota L. F1 hybrid Starca) excised hypocotyls were cultured on Murashige and Skoog medium with and without 2,4‐dichlorophenoxy acetic acid (2,4‐D) to determine the effect of this plant growth regulator on ... -
Hormonal status of maize initial explants and of the embryogenic and non-embryogenic callus cultures derived from them as related to morphogenesis in vitro
(2001)Endogenous hormone levels (indole-3-acetic acid [IAA], abscisic acid [ABA], gibberellins 1, 3 and 20 [GAs], zeatin/zeatin riboside [Z/ZR] and N6[Δ2-isopentenyl] adenine/N6[Δ2-isopentenyl] adenosine; [iP/iPA]) were analysed ...