Consulta: creatorFacets:"Coan,Alessandra Ike"
Registros recuperados: 5
Data/hora: 18/05/2024 11:16:06

Anatomia de algumas espécies aquáticas de Eriocaulaceae brasileiras
Provedor de dados: Acta Botanica Brasilica
Autores: Coan,Alessandra Ike; Scatena,Vera Lucia; Giulietti,Ana Maria.
Estudou-se a anatomia de raízes, caules, folhas e escapos de Eriocaulon elichrysoides, Leiothrix fluitans, Paepalanthus obtusifolius, Philodice hoffmannseggii, Syngonanthus caulescens e Tonina fluviatilis,espécies aquáticas de Eriocaulaceae que ocorrem em diferentes ecossistemas brasileiros, visando a caracterização anatômica das mesmas e também a interpretação das adaptações ao ambiente. Essas plantas caracterizam-se por apresentarem raízes com aspecto esponjoso e esbranquiçado; acúmulo de ar no córtex; epiderme unisseriada, de paredes finas; córtex externo, mediano e interno; endoderme unisseriada e periciclo unisseriado ou multisseriado. Em L. fluitans, P. obtusifolius e T. fluviatilis foram observadas raízes absorventes com aerênquima e raízes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomia; Eriocaulaceae brasileiras; Hidrofitismo; Órgãos vegetativos.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062002000400001

Confirmação da ocorrência de Abolboda poarchon Seub. (Xyridaceae) no Estado de São Paulo, Brasil
Provedor de dados: Acta Botanica Brasilica
Autores: Coan,Alessandra Ike; Oriani,Aline; Lombardi,Julio Antonio.
A ocorrência de Abolboda poarchon Seub. é documentada para o Estado de São Paulo, com base em coletas realizadas no município de Itirapina. O trabalho apresenta a descrição detalhada de A. poarchon e A. pulchella, espécies simpátricas, com características diagnósticas e distintivas para o reconhecimento das mesmas no campo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo úmido; Flora; Monocotiledôneas; Neotrópicos; Poales.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000300032

Importance of anatomical leaf features for characterization of three species of Mapania (Mapanioideae, Cyperaceae) from the Amazon Forest, Brazil
Provedor de dados: Acta Amazonica
Autores: Silva,Arthur de Lima; Alves,Marccus Vinícius da Silva; Coan,Alessandra Ike.
Mapania belongs to Mapanioideae, a quite controversial subfamily in Cyperaceae due to the existence of unusual characters in both reproductive and vegetative organs. The genus is represented by seven species in Northern Brazil but taxonomic valuable information related to the leaf organs is still unknown. The present study aimed the anatomical description of the leaf organs (either basal leaves or cataphylls and involucral bracts) of three representative Brazilian species of Mapania. Samples of cataphylls, basal leaves and involucral bracts were sectioned and stained for observations under light microscopy. The involucral bracts provide the most elucidative characters (ten) to distinguish the three species The basal leaves provides six distinguishing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerenchyma; Cataphylls; Hypolytreae; Involucral bracts; Poales.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400006

Leaf Morphological Plasticity of Tree Species from Two Developmental Stages in Araucaria Forest
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Vieira,Willyam de Lima; Boeger,Maria Regina Torres; Cosmo,Nelson Luiz; Coan,Alessandra Ike.
This study compared the morphological and anatomical variations of the leaves of four shade-tolerant tree species Allophylus edulis (St.-Hil.) Radlk (Sapindaceae), Casearia sylvestris Sw. (Salicaceae), Cupania vernalis Cambess. (Sapindaceae) and Luehea divaricata Mart. (Malvaceae) from a fragment of Araucaria forest in two developmental stages. Morphological and anatomical traits, such as leaf and tissue thickness, leaf area, leaf dry mass, specific leaf area, leaf density and stomata density were measured from 30 leaves of each developmental stage. The phenotypic plasticity index was also calculated for each quantitative trait. The results showed that the four species presented higher mean values ​​for specific leaf area and spongy/palisade parenchyma...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf anatomy; Leaf morphology; Ombrophyllous Mist Forest; Shade tolerance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000400476

Seed morphology and post-seminal development of Tillandsia L. (Bromeliaceae) from the "Campos Gerais", Paraná, Southern Brazil
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Scatena,Vera Lucia; Segecin,Simone; Coan,Alessandra Ike.
This work studied the morphology and post-seminal development of seeds of Tillandsia gardneri Lindl., T. streptocarpa Baker, and T. stricta Sol. ex Sims (Bromeliaceae) from the "Campos Gerais", State of Paraná, Southern Brazil. The seeds (ca. 2.0 mm long) presented plumose appendages at their micropylar end, an important structure in the taxonomy of the family since it represented an elaborate apparatus allowing effective wind-dispersal. Seeds germinated after circa twenty days. The haustorial cotyledon, responsible for the seedling nutrition, appeared first during the germination process. No cataphyll or primary roots developed. A small tank came along in the seedling, formed by the base of the sheath of the first leaf, which overlapped that of the second...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tillandsia; Seed morphology; Post-seminal development.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700012