Coconut (Cocos nucifera) is a monoic species with a large one-seeded fruit that is commercialized... more Coconut (Cocos nucifera) is a monoic species with a large one-seeded fruit that is commercialized in all tropical regions. A study of the anatomic structure of staminate and pistillate flowers was carried out in order to complement the knowledge on the reproductive biology of this species. The plant material was fixed, dehydrated, and conventional anatomical techniques were applied. Floral structure is characterized by abundant schlerenchymatous tissue and idioblasts with raphides, silica bodies and other substances; androecium with exothecium and endothecium composed by a single layer of cells; gynoecium with intercarpellary septal nectaries and three bitegumented ovules. The flowers of this palm present a group of anatomic traits that address its protection against insects or other animal feedings.
Copernicia and Washingtonia are two genera of the Trachycarpeae for which no subtribal classifica... more Copernicia and Washingtonia are two genera of the Trachycarpeae for which no subtribal classification has been proposed, mainly because of the lack of resolution in phylogenetic studies. Morphology and anatomy of flowers whithin Coryphoideae have proven useful for taxa delimitation and supporting relationships among their members. A description of the morphological and anatomical structure of flowers of C. tectorum and W. filifera is presented in order to explore reproductive characters that may clarify their classification within the subfamily and to contribute with floral biology studies. Flowers of cultivated specimens of both taxa and developing fruits of C. tectorum were fixed in FAA, dissected for morphological analysis, and parafin-embedded flowers and fruits were serially sectioned for obtaining permanent slides, using conventional techniques and safranin-fast green staining. All procedures were carried out in the Laboratory of Morpho-Anatomy, Agronomy Faculty of the Univers...
Se presenta el primer estudio comparativo de la anatomía de la lámina foliar en la subtribu Mauri... more Se presenta el primer estudio comparativo de la anatomía de la lámina foliar en la subtribu Mauritiinae (Arecaceae) que incluye a todos los géneros y la mayoría de las especies reconocidas para el grupo. La anatomía foliar define con claridad a estas palmas neotropicales y permite la identificación de dos grupos: Lepidocaryum se distingue por la presencia de un mesófilo homogéneo, mientras que el grupo formado por Mauritia y Mauritiella comparte la presencia de un mesófilo diferenciado en parénquima en empalizada y esponjoso. Nuestro estudio apoya los arreglos propuestos en las más recientes filogenias moleculares que han incluido a los tres géneros; sin embargo, no logró identificar caracteres lo suficientemente concluyentes para una separación específica. This represents the first comparative study of the leaf anatomy within the subtribe Mauritiinae (Arecaceae) and includes all three genera and most of the recognized species. The leaf blade anatomy clearly defines these neotropical palms and allows the identification of two groups: Lepidocaryum can be separated by its homogeneous mesophyll, while the group formed by Mauritia y Mauritiella has the shared presence of a diferentiated mesophyll into palisade and spongy parenchyma. Our study supports the topologies of the most recent molecular phylogenies that include these three genera; however we did not identify characters that are sufficiently variable for species identification.
Coconut (Cocos nucifera) is a monoic species with a large one-seeded fruit that is commercialized... more Coconut (Cocos nucifera) is a monoic species with a large one-seeded fruit that is commercialized in all tropical regions. A study of the anatomic structure of staminate and pistillate flowers was carried out in order to complement the knowledge on the reproductive biology of this species. The plant material was fixed, dehydrated, and conventional anatomical techniques were applied. Floral structure is characterized by abundant schlerenchymatous tissue and idioblasts with raphides, silica bodies and other substances; androecium with exothecium and endothecium composed by a single layer of cells; gynoecium with intercarpellary septal nectaries and three bitegumented ovules. The flowers of this palm present a group of anatomic traits that address its protection against insects or other animal feedings.
Copernicia and Washingtonia are two genera of the Trachycarpeae for which no subtribal classifica... more Copernicia and Washingtonia are two genera of the Trachycarpeae for which no subtribal classification has been proposed, mainly because of the lack of resolution in phylogenetic studies. Morphology and anatomy of flowers whithin Coryphoideae have proven useful for taxa delimitation and supporting relationships among their members. A description of the morphological and anatomical structure of flowers of C. tectorum and W. filifera is presented in order to explore reproductive characters that may clarify their classification within the subfamily and to contribute with floral biology studies. Flowers of cultivated specimens of both taxa and developing fruits of C. tectorum were fixed in FAA, dissected for morphological analysis, and parafin-embedded flowers and fruits were serially sectioned for obtaining permanent slides, using conventional techniques and safranin-fast green staining. All procedures were carried out in the Laboratory of Morpho-Anatomy, Agronomy Faculty of the Univers...
Se presenta el primer estudio comparativo de la anatomía de la lámina foliar en la subtribu Mauri... more Se presenta el primer estudio comparativo de la anatomía de la lámina foliar en la subtribu Mauritiinae (Arecaceae) que incluye a todos los géneros y la mayoría de las especies reconocidas para el grupo. La anatomía foliar define con claridad a estas palmas neotropicales y permite la identificación de dos grupos: Lepidocaryum se distingue por la presencia de un mesófilo homogéneo, mientras que el grupo formado por Mauritia y Mauritiella comparte la presencia de un mesófilo diferenciado en parénquima en empalizada y esponjoso. Nuestro estudio apoya los arreglos propuestos en las más recientes filogenias moleculares que han incluido a los tres géneros; sin embargo, no logró identificar caracteres lo suficientemente concluyentes para una separación específica. This represents the first comparative study of the leaf anatomy within the subtribe Mauritiinae (Arecaceae) and includes all three genera and most of the recognized species. The leaf blade anatomy clearly defines these neotropical palms and allows the identification of two groups: Lepidocaryum can be separated by its homogeneous mesophyll, while the group formed by Mauritia y Mauritiella has the shared presence of a diferentiated mesophyll into palisade and spongy parenchyma. Our study supports the topologies of the most recent molecular phylogenies that include these three genera; however we did not identify characters that are sufficiently variable for species identification.
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