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Publications (48)
Introduction: Research into the ontogeny of sporangia and sporogenesis of leptosporangiate ferns is scarce in the scientific literature.
Objectives: To describe and analyze the ontogeny of sporangia, sporogenesis, micromorphology, and ultrastructure of mature spores of the fern Anemia hirsuta.
Methods: Fertile fronds of A. hirsuta were processed ac...
Introducción:
Los estudios sobre la microsporogénesis de Rubus glaucus son inexistentes y poco es conocido sobre la ultraestructura del polen.
Objetivos:
Describir la microsporogénesis, y la ultraestructura de los granos de polen en Rubus glaucus.
Métodos:
Flores en diferentes etapas de desarrollo fueron incluidas en parafina o en resina. Las sec...
Se estudió la fenología de la floración en un ambiente de humedales de Berisso, Buenos Aires, Argentina. La composición y el relevamiento estacional de la vegetación se analizaron mediante visitas quincenales al área de estudio entre los años 2016 y 2018 registrando 49 familias y 118 especies de Angiospermas. Las familias botánicas con mayor riquez...
Introducción:
Los estudios sobre microsporogénesis, micromorfología y estructura de los granos de polen en Malvaceae son escasos.
Objetivos:
Describir el proceso de microsporogénesis y aspectos micromorfológicos de los granos de polen en A. rosea.
Métodos:
Se procesaron más de 30 andróforos de acuerdo con los protocolos estándar para incrustar y...
Introducción:
A pesar de que T. cacao es una especie importante a nivel mundial por la producción de cacao, es poco lo que se conoce sobre la micromorfología y estructura de las anteras y los granos de polen.
Objetivos:
Describir y analizar la estructura y micromorfología de las anteras y los granos de polen de 10 genotipos élite de esta important...
Polen de Commelinaceae y Pontederiaceae (Commelinales) de humedales rioplatenses (Argentina). Se estudiaron los caracteres de los granos de polen de Commelinaceae y Pontederiaceae que crecen en áreas de humedales rioplatenses. Los estudios se realizaron con microscopio óptico y electrónico de barrido. Se actualizaron los conocimientos previos sobre...
Micromorfología y ultraestructura de las anteras y los granos de polen en diez genotipos élite de Theobroma cacao (Malvaceae) ABSTRACT Micromorphology and ultrastructure of anthers and pollen grains in ten elite genotypes of Theobroma cacao (Malvaceae). Introduction: Despite the fact that T. cacao is an important species worldwide for cocoa product...
Despite the fact that T. cacao is an important species worldwide for cocoa production, little
is known about the micromorphology and structure of anthers and pollen grains. Objectives: To describe and analyze the structure and micromorphology of the anthers and pollen grains of 10 elite genotypes of this important tropical species. Methods: More th...
Population variations of predatory hoverflies in agroecosystems depend mainly on the resources that crops and wild vegetation provides them as well as death caused by natural enemies. We identified I) aphidophagous hoverfly species in lettuce and broccoli crops in Buenos Aires, II) the seasonal variations of the immature stages and their larval par...
Introducción y objetivos: Los cultivares de Canna resultaron de la hibridación intensiva de cinco especies americanas diploides: C. flaccida Salsb., C. glauca L., C. indica L, C. iridiflora Ruiz et Pav. y C. warscewiczii A. Dietr. Se estudia por primera vez la morfología palinológica y la viabilidad del polen de tres híbridos triploides pertenecien...
Pollen morphology, ultrastructure and germination mode of Ibicella lutea was investigated and documented using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Ibicella pollen is clypeate, spheroidal, apolar, inaperturate, insulated, large, with an average diameter of 80 μm. The pollen wall is fo...
Morphology, characterization, and geographical distribution of Blechnum cordatum (Blechnaceae-Pteridophyta). Specimens of Blechnum cordatum from localities of its large geographical area were analized. The species grows in Mesoamerica, Antillas and South America, from Venezuela and Colombia to Bolivia, SE and centre of Brazil, Paraguay, Argentina,...
Pollen morphology, ultrastructure and germination mode of Ibicella lutea were investigated and documented using light microscopy (LM) scanning electron microscopy (SEM) and transmission electron microscope (TEM). Ibicella pollen is clypeate, spheroidal, apolar, inaperturate, insulated, large, with an average diameter of 80 μm. The pollen wall is fo...
p>Se llevó a cabo un estudio con microscopía de luz y electrónica de barrido (MEB) de los caracteres de la epidermis y de la ontogenia de los estomas en especies neotropicales de Canna (Cannaceae). Se estudiaron la presencia y tipos de indumento, el contorno foliar, los tipos de cera epicuticular, los modelos epidérmicos, el ordenamiento celular tí...
Forensic Palynology is an important tool to resolve the place and sometimes the season of the year of a fact. The palynomorphs may be in different objects (clothes, shoes, ropes). Pollen morphology is sometimes exclusive for a plant species and some of them grow in specific areas besides plants produce pollen at certain times of the year. The study...
Se presenta un estudio, efectuado con microscopía de luz y electrónica de barrido, de la morfología del polen de representantes nativos, naturalizados y cultivados de Zingiberales, que crecen en humedales rioplatenses y selvas subtropicales del NE de la Argentina. Las especies analizadas son Canna glauca y C. índica (Cannaceae), Heliconia psittacor...
We focused on characters of sporogenous pinnae of 42 taxa in the genus Blechnum L. to highlight their diagnostic value in the genus, and whether they vary at species level or are shared by related species. This work included amphibious, herbaceous terrestrial, cordatoid, arborescent and epiphyte-hemiepiphyte taxa. We studied the anatomy of the fert...
RESUMEN. – En este trabajo se han estudiado caracteres de las pinnas esporógenas en 42 taxones de Blechnum L., con el fi n de poner en evidencia su valor diagnóstico en el nivel específi co o de grupos de especies afi nes. Se incluyeron especies palustres, herbáceas terrestres, cordatoides, arborescentes y epífi tas o hemiepífi tas. Se estudiaron l...
We describe and figure the previously unknown male of Hypanthidioides (Ctenanthidium) bifasciata (Urban, 1993) based on specimens reared from a trap nest along with a female. This species, originally known only from the type specimen collected in Colonia, Uruguay, is also newly recorded from Buenos Aires, Argentina. We provide for the first time in...
This paper presents an analysis of phytocoenoses and updated lists of the vascular flora (with the exception of Poaceae) of two permanent wetlands, La Balandra and Isla Santiago, and several temporary wetlands (Arroyo Rodriguez, Arroyo El Gato, and others) in the coastal areas of the Rio de La Plata (Buenos Aires Province, Argentina). The study was...
Studies on reproductive aspects, spore morphology and ultrastructure of Lycopodiaceae are not very common in the scientific literature, and constitute essential information to support taxonomic and systematic relationships among the group. In order to complete existing information, adding new and broader contributions on these topics, a comparative...
Abstract: Sporogenesis, sporoderm and mature spore ornamentation in Lycopodiaceae. Studies on reproductive
aspects, spore morphology and ultrastructure of Lycopodiaceae are not very common in the scientific
literature, and constitute essential information to support taxonomic and systematic relationships among the
group. In order to complete existi...
La bibliografía sobre el género Blechnum L. es muy abundante tanto en lo que respecta a las especies neotropicales como paleotropicales. Sin embargo, aún faltan estudios anatómicos completos, una caracterización actualizada de su morfología externa e interna, taxonomía, citología y afinidades. En este estudio se revisaron ocho especies de Blechnum...
Although the genus Blechnum has been largely studied, problems of species characterization, nomenclature, classification and taxonomy remain unsolved. For these reasons, in this study we intend to deepen in the characterization of the arborescent group of Blechnum with a review of eight species: B. brasiliense, B. columbiense, B. cycadifolium, B. m...
Doce taxones del genero Blechnum fueron seleccionados para su estudio: B. arcuatum, B. asplenioides, B. australe subsp. australe, B. australe subsp. hastatum, B. glandulosum subsp. glandulosum, B. glandulosum subsp. austrobrasilianum, B. gracile, B. lanceola, B. levigatum, B. meridense, B. occidentale y B. polypodioides. Se actualiza la descripcion...
Twelve taxa of genus Blechnum were selected to study: B. arcuatum, B. asplenioides, B. australe subsp. australe, B. australe subsp. hastatum, B. glandulosum subsp. glandulosum, B. glandulosum subsp. austrobrasilianum, B. gracile, B. levigatum, B. lanceola, B. meridense, B. occidentale and B. polypodioides. An updated description of all taxa, their...
A study of the pollen present in honey from an apiary located in the area of the Depresion del Salado, Buenos Aires, Argentina, in order to observe the plants used by Apis mellifera L. in an environment that has been affected by periodic floods that changed the vegetation, and making comparisons with existing data. Thirty one pollen types belonging...
A study of the pollen present in honey from an apiary located in the area of the Depresion del Salado, Buenos Aires, Argentina, in order to observe the plants used by Apis meilifera L. in an environment that has been affected by periodic floods that changed the vegetation, and making comparisons with existing data. Thirty one pollen types belonging...
A study of the spores of 64 neotropical and palaeotropical taxa of the genus Blechnum was performed using scanning electron microscopy (SEM). Two basic types of perispores were recognised: perispore smooth or only slightly ornamented (laevigate, with micro-granules or micro-lamellae, venulose and rugulate), and perispore ornamented (rugate, low ret...
In the present paper, we provide a revised, comprehensive description of the sporophyte and gametophyte of the swamp fern, Blechnum serrulatum Rich., from neo- and paleotropical localities. External and internal characters of the sporophyte were analysed, including axes, laminae, pinnae, indusia and spores. Intercellular pectic connections of the p...
The massulae and pollen grains in pollinia of four palustrine South American species of Habenaria, H. bractescens, H. gourlieana, H. paucifolia and H. secunda were studied here for the first time using light, scanning, and transmission electronic microscopy. The pollinia have acalymmate, piriform or tabular massulae. Filiform elastoviscin threads a...
Se estudió la morfología de los granos de polen de ocho táxones de Canna, C. ascendens, C. coccinea, C. compacta, C. glauca, C. indica, C. paniculata, C. variegatifolia y C. fuchsina, nueva especie aún no descrita, que fueron estudiadas usando microscopio de luz y microscopio electrónico de barrido. Nosotros utilizamos la técnica de Wodehouse en mu...
La morfología del polen de cuatro especies neotropicales del género Podostemum (Podostemaceae) se describe aquí por primera vez mediante microscopía de luz y electrónica de barrido, utilizando material deshidratado en punto crítico. Se analizaron ejemplares de P. comatum, P. distichum, P. muelleri y P. rutifolium. Los granos de polen son dispersado...
The morphology of pollen grains of eight taxa of Canna, C. ascendens, C. coccinea, C compacta, C. glauca, C. indica, C. paniculata, C. variegatifolia and C. fuchsina, an unpublished new species, were studied using light and scanning electronic microscopes. We used the Wodehouse technique on samples of 20 grains per specimen to measure the intine wi...
Pollen morphology of neotropical species of Podostemum is described for the first time with light (LM) and scanning electronic microscopes (SEM), using pollen dehydration by critical point. Herbarium specimens under study are P. comatum, P. distichum, P. muelleri and P. rutifolium. Pollen grains are dispersed in dyads. Observed with LM, dyads range...
The fern Blechnum sprucei grows in Mesoamerica (Costa Rica) and South America, from Colombia to Bolivia, SE and centre of Brazil, Paraguay and Argentina. It is a distinctive, somewhat vulnerable, mostly orophilous species. Fresh and dry herbarium material was used for this study. Herbarium material for anatomical studies comes from CTES, BA, LP, MA...
Especímenes de B. tabulare y B. magellanicum procedentes de toda su área de distribución fueron estudiados en detalle y considerados especies diferentes. Se estudiaron los siguientes caracteres: rizomas, escamas rizomáticas, estípites, división de las láminas dimórficas, contorno, textura, tamaño, margen, indumento, venación, modelo epidérmico, est...
Specimens of B. tabulare and B. magellanicum from their whole geographical area were studied, and taxa were treated as different species. The following characters were analyzed: rhizomes, rhizomatic scales, stipes, division of dimorphic laminae, outline, texture, size, margins, indument, venation, epidermal patterns, stomata (size and density), mes...
Estudios esporales en especies del grupo Blechnum penna-marina (Blechnaceae-Pteridophyta). Las esporas de once taxones del grupo B. penna marina, B. asperum, B. blechnoides, B. corralense, B. fernandezianum, B. microphyllum, B. mochaenum subsp. achalense, B. mochaenum subsp. mochaenum, B. mochaenum subsp. squamipes, B. penna-marina, B. spicant y B....
Dynamics of pollen release in relation to anther-wall structure among species of Solanum (sects Brevantherum, Cyphomandropsis and Pachyphylla) were studied. Differences in anther-wall qualities (multi-layered and rigid v. single-layered and flexible) were correlated with shifts between vibratory and pneumatic mechanisms. The species presented diffe...
The study of anther development of Solanum sect. Cyphomandropsis species (Solanum confusum Morton, Solanum glaucophyllum Desf. and Solanum stuckertii Bitter) provide information about differences between the anther wall layers and placentoid behaviour at maturity and according with the floral syndrome. It is known that in Solanum species with vibra...
The role of scent and floral colour in three Solanum sect. Cyphomandropsis species with different floral rewards was studied. In the two studied species with pollen rewards, S. glaucophyllum Desf. and S. stuckertii Bitter, the principal advertisement to pollinators is the colour of the perianth and anthers, including areas that absorb UV light. In...
Pollen structure of three species of Apinagia (Podostemaceae) that grow in the Paranean Province, South America, are described. The pollen grains are isopolar, tricolpate, spheroidal to subprolate, with microechinate sculpture. The ornamental processes are of different size. The colpus membrane has similar ornamentation as the non-apertural wall bu...
Se estudió la influencia de la abeja Apis mellifera en la producción del zapallito de tronco, Cucurbita máxima (Duch.), en plantas cubiertas, excluyendo todas las visitas de insectos y en plantas con polinización abierta. Se observaron diferencias entre los tratamientos. Las plantas expuestas a la visita de Apis mellifera produjeron más frutos, de...
The morphology, energy reserves and viability of three species from Solanum Sect. Cyphomandropsis (Solanum adelphum Morton, S. glaucophyllum Desf. and S. stuckertii Bitter), which grow in Argentina were studied. The pollen grains are tricolporate and their characters are homogeneous. The only differences found among the species were the pollen grai...
