Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae)

Correia de Araújo Neto, Joao; Bergemann de Aguiar, Ivor

dc.creator	Correia de Araújo Neto, Joao
dc.creator	Bergemann de Aguiar, Ivor
dc.date	2015-05-27
dc.date.accessioned	2016-05-03T15:25:14Z
dc.date.available	2016-05-03T15:25:14Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/19255
dc.identifier.uri	https://hdl.handle.net/10669/25588
dc.description	Guazuma ulmifolia is as popular reforestatíon free all over Latin America. It is characteristíc of the initial stages of the secondary sucession and presents porentíal utility in the restoring of degraded areas. There is no information about fruil, seed and seedling morphology, which is of fundamental importance for identífica! ion, extraction, management and seed germination as well as for the characterization of post-seminal development and normal seedling pattern. To obtain such information, external fruit, and external and internal seed structures were studied considering shape, size, micropile and embryo localization, and tegumentar structures. Al! stages of this work were conduced in the Universidade Estadual Paulista (UNESP), Campus of Jaboticabal city. The fruits were collected in a mixed plantation in Jaboticabal city, State of Sao Paulo, Brazil. For the biometric study eight repetitions of ten fruits and eight repetitions of 100 seeds were utilized. For seed internal traits study, 50 seeds were drenched in a distíll;d water, cut, and observed with a scanning electron microscope and a stereomicroscope. For post-seminal study ten repetitions of seven seeds were scarificated chemically with sulphuric acid during 50 min, and placed to germinate in a culture medium, al 300C, and eight hours of photoperiod. We found elipsoid, woody, indehiscent, pentacarpelar fruits, with a mean lenght of2 2.6 1 mm (diameter 24.88 mm) and 64.0 seeds per fruit. Seed shape varies, mean length is 3.07 mm (width of2.36 mm).The seed is bitegumented, tegmic, with a continuous, axial and curved embryo. The germination is epigeal and the seedlings are fanerocotiledoneus. Drawings of all stages are included.	en-US
dc.description	Se caracterizaran morfológicamente, frutos, semillas y plántulas, siendo realizados descripciones de la forma, tamaño y superficie de semillas, posición de micrópilo y forma y localización del embrión de Guazuma ulmifolia (un árbol heliófito, característico de los estádios iniciales de la sucesión). Para descripción morfológica de las plántulas, las semillas fueron inmersas en ácido sulfúrico por 50 min y colocadas para germinar en medio de cultura a temperatura de 300C. El fruto es del tipo elipsoide, leñoso, pentacarpelar, polispérmico, con media de 22.6 mm de longitud y 24.9 mm de diámetro. Las semillas presentan formato heterogéneo, con 3.07 mm de longitud por 2.36 mm de ancho. Son bitegumentadas, tégmica, con embrión axilar y continuo. La germinación es epígea y las plántulas presentan características fanerocotiledonares.	es-ES
dc.format	application/pdf
dc.language	spa
dc.publisher	Universidad de Costa Rica	en-US
dc.rights	Copyright (c) 2015 International Journal of Tropical Biology and Conservation	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol.47 (4) December 1999; 785-790	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol.47 (4) December 1999; 785-790	es-ES
dc.source	Revista Biología Tropical; Vol.47 (4) December 1999; 785-790	pt-PT
dc.source	2215-2075
dc.source	0034-7744
dc.title	Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae)	en-US
dc.title	Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae)	es-ES
dc.type	artículo original

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