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| Format: | Artículo científico |
| Language: | es |
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Universidad de Costa Rica
2014
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| Online Access: | https://www.redalyc.org/articulo.oa?id=44931383028 |
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Table of Contents:
- Estructura, ontogenia y vascularización de las flores e inflorescencias de Drimys granadensis (Winteraceae) Xavier Marquínez Biología calyptra Key words phyllotaxis proliferation uniflorescence Drimys granadensis is a widespread species in montane forests of South and Central America. i n this research, the structure, ontogeny, phyllotaxis and vascularization of the flowers and inflorescences of this species was studied in a population from the Eastern hills of Sabana de Bogota, Colombia. The methods used applied both optical microscopy, with astra blue-fuchsin staining, and scanning electron microscopy, using critical point dryed and gold-paladium metallized samples. Besides, results were compared with those of Drimys winteri , a widely studied species distributed in Chile and Argentina. Additionally, we studied the detail of the floral anatomy to determine the bracteal or calicine identity of the caliptra. i confirmed the proliferative status of the monothelic inflorescence, discarding alternative explanations of the terminal flower identity. i found that uniflorescences have an acropetal development until the terminal meristem becomes the terminal flower, then this flower develops rapidly resulting in a determined uniflorescence. i found pseudosyphonosthelic vasculariza - tion in peduncles and pedicels. Besides, i discovered some evidence in the vascular and anatomical structures, to consider the caliptra as the fusion product of various structures and therefore of calicine origin. The caliptra showed a whorled phyllotaxis, but the petals, stamens and carpels presented a spiral condition; phyllotaxis change was explained by the long time lapse between the initiation of the calyx and the corolla. i found great similarities among the inflorescences of D. granadensis and D. winteri ; they were different in the proliferation start time, and in the frequent presence of nomophylls in D. granadensis , in contrast to the presence of reduced bracts and bracteoles in D. winteri inflorescences . Rev. Biol. Trop. 62 (2): 743-756. Epub 2014 June 01. 2014 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44931383028 es http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.2 Vol.62