Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae)
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)....
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| Format: | Article |
| Language: | English |
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Vicerractoría Investigación
1999-12-01
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| Series: | Revista de Biología Tropical |
| Subjects: | |
| Online Access: | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77441999000400015 |
| _version_ | 1797711742778736640 |
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| author | João Correia de Araújo Neto Ivor Bergemann de Aguiar |
| author_facet | João Correia de Araújo Neto Ivor Bergemann de Aguiar |
| author_sort | João Correia de Araújo Neto |
| collection | DOAJ |
| 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 30 ºC. 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 caracteristicas fanerocotiledonares.<br>Guazuma ulmifolia is as popular reforestation tree all over Latin America. It is characteristic of the initial stages of the secondary sucession and presents potential utility in the restoring of degraded areas. There is no information about fruit, seed and seedling morphology, which is of fundamental importance for identification, 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. All 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 São 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 distiled 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, at 30°C, and eight hours of photoperiod. We found elipsoid, woody, indehiscent, pentacarpelar fruits, with a mean lenght of 22.61 mm (diameter 24.88 mm) and 64.0 seeds per fruit. Seed shape varies, mean length is 3.07 mm (width of 2.36 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. |
| first_indexed | 2024-03-12T07:11:37Z |
| format | Article |
| id | doaj.art-d87d16586f9248ef802f9b7f675f101e |
| institution | Directory Open Access Journal |
| issn | 0034-7744 2215-2075 |
| language | English |
| last_indexed | 2024-03-12T07:11:37Z |
| publishDate | 1999-12-01 |
| publisher | Vicerractoría Investigación |
| record_format | Article |
| series | Revista de Biología Tropical |
| spelling | doaj.art-d87d16586f9248ef802f9b7f675f101e2023-09-02T23:04:31ZengVicerractoría InvestigaciónRevista de Biología Tropical0034-77442215-20751999-12-01474785790Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae)João Correia de Araújo NetoIvor Bergemann de AguiarSe 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 30 ºC. 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 caracteristicas fanerocotiledonares.<br>Guazuma ulmifolia is as popular reforestation tree all over Latin America. It is characteristic of the initial stages of the secondary sucession and presents potential utility in the restoring of degraded areas. There is no information about fruit, seed and seedling morphology, which is of fundamental importance for identification, 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. All 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 São 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 distiled 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, at 30°C, and eight hours of photoperiod. We found elipsoid, woody, indehiscent, pentacarpelar fruits, with a mean lenght of 22.61 mm (diameter 24.88 mm) and 64.0 seeds per fruit. Seed shape varies, mean length is 3.07 mm (width of 2.36 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.http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77441999000400015Guazuma ulmifoliaforest seedfruitgerminationseedlingplantletmorphology |
| spellingShingle | João Correia de Araújo Neto Ivor Bergemann de Aguiar Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae) Revista de Biología Tropical Guazuma ulmifolia forest seed fruit germination seedling plantlet morphology |
| title | Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae) |
| title_full | Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae) |
| title_fullStr | Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae) |
| title_full_unstemmed | Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae) |
| title_short | Desarrollo ontogénico de plántulas de Guazuma ulmifolia (Sterculiaceae) |
| title_sort | desarrollo ontogenico de plantulas de guazuma ulmifolia sterculiaceae |
| topic | Guazuma ulmifolia forest seed fruit germination seedling plantlet morphology |
| url | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77441999000400015 |
| work_keys_str_mv | AT joaocorreiadearaujoneto desarrolloontogenicodeplantulasdeguazumaulmifoliasterculiaceae AT ivorbergemanndeaguiar desarrolloontogenicodeplantulasdeguazumaulmifoliasterculiaceae |