Navegando por Autor "KIKUCHI, Tatiani Yuriko Souza"

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Acesso aberto (Open Access)
Estruturas secretoras em cipó-d'alho (Mansoa standleyi (Steyerm.) A. H. Gentry, Bignoniaceae): ocorrência e morfologia
(Instituto Nacional de Pesquisas da Amazônia, 2012-09) POTIGUARA, Raimunda Conceição de Vilhena; DIAS, Ana Cristina Andrade de Aguiar; KIKUCHI, Tatiani Yuriko Souza; SANTOS, Ana Carla Feio dos; SILVA, Rolf Junior Ferreira
Species of Mansoa are called "cipó-d'alho" because of the smell of garlic that wafts from their vegetative and reproductive parts. Since data on the morphology and occurrence of their secretory structures are scarce and even absent for M. standleyi, the present work characterizes the distribution and morphology of such structures in the vegetative aerial axis of the latter. To do so, samples of the leaf blade and of nodal regions were fixed and examined using histological and scanning electron microscope techniques. Histochemical tests with appropriate controls were carried out on the secretory structures during the secretory phase. Fly and ant individuals that visit the species were sampled, preserved and identified by an entomologist. The secretory structures of the vegetative aerial axis of M. standleyi are peltate and patelliform glandular trichomes. All develop asynchronously and are present in the nodal regions and leaf blade, mainly in their youngest parts. Trichomes form a secretory complex in the nodal regions while they are scattered in the leaf blade. Histochemical analyses revealed that the cupulate and patelliform trichomes are extrafloral nectaries and that the peltate ones present an alkaloid fraction. The visitors of the nodal glands are ants Crematogaster (Formicidae) and Ectatomma brunea (Vespoidea, Formicidae) and flies Oxysarcodexia (Sarcophagidae, subfamily Utitidae [Ulidiidae]). The secretory structures of the vegetative aerial axis of Mansoa standleyi are similar to those reported for Bignoniaceae. An extrafloral nectary is described for M. standleyi for the first time.
Acesso aberto (Open Access)
Leaf anatomical features of three Theobroma species (Malvaceae s.l.) native to the Brazilian Amazon
(Instituto Nacional de Pesquisas da Amazônia, 2014-09) GARCIA, Tarcymara Barata; POTIGUARA, Raimunda Conceição de Vilhena; KIKUCHI, Tatiani Yuriko Souza; DEMARCO, Diego; DIAS, Ana Cristina Andrade de Aguiar
Theobroma species have economic importance due to their use in the cosmetic and food industries, mainly in the production of chocolate. However, the anatomy of their vegetative structures remains poorly studied. The goal of this study was to describe the anatomical features of Theobroma grandiflorum, T. speciosum and T. subincanum to contribute to the biological knowledge of these species, as well as provide support to the biotechnological studies of native fruit plants of the Amazon. Leaves at different developmental stages were collected and analyzed under light microscopy and scanning electron microscopy. Sessile and stalked stellate trichomes and digitiform glandular trichomes were observed in the expanded leaves of T. grandiflorum and T. subincanum. These species were also similar in the morphology of the midrib, the organization of the mesophyll and the presence of starch grains in the midrib pith cells. Claviform glandular trichomes and mucilage cells in the epidermis occurred only in the expanded leaves of T. speciosum. The presence of mucilage secretory trichomes in shoot apices (colleters) of all species is a new finding for the genus Theobroma.