Due to the economic and agronomic potencial that mortiño (Vaccinium floribundum Kunth) has in Ecuador, the objective of this research was to establish in vitro propagation methods for this species by seed germination and by shoot growth from axillary buds. Modified Woody Plant Medium [1] (mWPM) was used, in which up to 60.7 % of seeds germinated. A strong cytokine, trans-zeatin riboside, TZR (1 mg/l), combined with α-napthaleneacetic acid, NAA (0.05 mg/l), was used to subculture the in vitro germinated plantlets. The use of basal medium without hormones or with 2iP, 6-(gamma,gamma-dimethylalylamino) purine, allowed elongation and rooting of plantletss. The acclimatization of mortiño plants has not yet been standardized, and further research is needed to find the conditions that are suitable for this process. To establish in vitro cultures by axillary buds, apical segments of the stem were disinfected and introduced in medium mWPM containing TZR, (7 mg/l) combined with NAA (0.1 mg/l). Growing buds were transferred to media with 2iP (3 or 5 mg/l) for propagation and elongation. This investigation is a preliminary study for the in vitro culture of mortiño, setting the basis for future research with this species.Keywords. trans-zeatin riboside (TZR), 6-(gamma,gamma-dimethylalylamino) purine (2iP), Vaccinium floribundum Kunth, in vitro germination, axillary buds. ResumenDebido al potencial agrícola y económico que tiene el mortiño (Vaccinium floribundum Kunth) para el Ecuador, esta investigación tuvo como objetivo establecer métodos de propagación in vitro de esta especie como germinación de semillas y brotación de yemas axilares. Se utilizó un medio basal sin hormonas, Woody Plant Medium [1] modificado (mWPM), en el que las semillas germinaron con hasta un 60.7 % de eficiencia. Para el subcultivo de plántulas germinadas in vitro , se usó una citoquinina fuerte, la trans zeatina ribóside, TZR (1 mg/l) en combinación con ácido α-naftalenacético, NAA (0.05 mg/l). El medio basal sin hormonas o con 2iP, 6-(gamma,gamma-dimetilalilamino) purina, permitió la elongación de las plántulas germinadas in vitro y su enraizamiento. La aclimatación de las plantas de mortiño cultivadas in vitro aún no está estandarizada y se requiere mayor investigación para encontrar los factores necesarios para completar satisfactoriamente este proceso. Para la introducción in vitro de yemas axilares se desinfectaron los extremos apicales de tallos de mortiño, y se los introdujo en medio mWPM suplementado con TZR (7 mg/l) en combinación con NAA, (0.1 mg/l). Las yemas brotadas se subcultivaron en medios que contenían 2iP (3 ó 5 mg/l) para su propagación y elongación. Esta investigación representa un estudio piloto para el cultivo in vitro del mortiño, sentando las bases para futuras investigaciones con esta especie.Palabras Clave. trans zeatina ribóside (TZR), 6-(gamma,gamma-dimetilalilamino) purina (2iP) , Vaccinium floribundum Kunth, germinación in vitro, brotación de yemas axilares. IntroducciónEl mortiño ( Vaccinium floribundum Kunth) e...
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