Now showing items 1-10 of 16
Challenges for Food and Nutrition Security in the Americas: Costa Rica and its commitment to sustainability
As a small nation with high biodiversity and an extensive system of protected areas, Costa Rica will face particular challenges regarding food security over the next few years. Thus, whatever development model the country ...
Response of Endogenous Hormone Concentrations to Two Floral Inductive Treatments, viz. KNO3 and PBZ, in Mango cv. ‘Tommy Atkins’ Growing Under Tropical Conditions
Floral induction (FI) has been intensively studied in mango, more under sub-tropical than under tropical environments. Decreases in temperature below 20 °C, which is common in sub-tropical regions but seldom occurs in many ...
Effect of macronutrients and sucrose concentration on in vitro growth of Drosera capensis L. (Droseraceae) plants, and evaluation of six substrates for acclimatization
The effect of two concentrations of the Murashige and Skoog macronutrients (full and half strength), in combination with three concentrations of sucrose (1.5, 3.0 and 4.5% w/v), was evaluated on the in vitro growth of ...
Changes in hormone concentrations during dormancy release of oil palm (Elaeis guineensis) seeds
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 ...
Effect of hydrogen cyanamide on the endogenous hormonal content of pea seedlings (Pisum sativum L.)
Efeito da cianamida hidrogenada sobre o conteúdo de hormônios endógenos em plântulas de ervilha (Pisum sativum L.)
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 ...
Regeneración in vitro mediante embriogénesis somática de variedades de cítricos. I. Obtención de callo friable y suspensiones celulares de naranja dulce (Citrus sinensis) y naranja agria (Citrus aurantium) cultivadas en Costa Rica
In vitro plant regeneration of citrus through somatic embryogenesis. I. Establishment of friable calli and suspension cultures of local cultivars of sweet orange (Citrus sinensis) and sour orange (Citrus aurantium). Friable ...
Endogenous hormone levels in habituated nucellar Citrus callus during the initial stages of regeneration
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 ...
Propagación in vitro de Phalaenopsis (Orchidaceae) mediante el cultivo de secciones de ejes florales después de la senescencia de las flores
Propagation of Phalaenopsis (Orchidaceae) through in vitro culture of nodal sections from senescent flower stalks
Segmentos nodales provenientes de inflorescencias senescentes de híbridos de Phalaenopsis fueron desinfectados dos veces y colocados en un medio sólido MS modificado bajo en calcio y con varios aditivos orgánicos (vitaminas, ...
Evolution of endogenous hormone concentration in embryogenic cultures of carrot during early expression of somatic embryogenesis
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 ...
Caracterización anatómica ultraestructural de las variantes “Atlántica”, “Sur” y “Cebolla” del bambú, Guadua angustifolia (Poaceae: Bambusoideae), en Costa Rica
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: ...