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Search Results: 1 - 10 of 61106 matches for " Appezzato-da-Glória Beatriz "
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Morpho-anatomical features of underground systems in six Asteraceae species from the Brazilian Cerrado
Appezzato-da-Glória, Beatriz;Cury, Graziela;
Anais da Academia Brasileira de Ciências , 2011, DOI: 10.1590/S0001-37652011005000018
Abstract: in the brazilian cerrado (neotropical savanna), the development of bud-bearing underground systems as adaptive structures to fire and dry periods can comprise an important source of buds for this ecosystem, as already demonstrated in the brazilian campos grasslands and north american prairies. asteraceae species from both woody and herbaceous strata have subterranean organs that accumulate carbohydrates, reinforcing the adaptive strategy of these plants to different environmental conditions. this study aims to analyse the morpho-anatomy of underground systems of six species of asteraceae (mikania cordifolia l.f. willd., mikania sessilifolia dc, trixis nobilis (vell.) katinas, pterocaulon alopecuroides (lam.) dc., vernonia elegans gardner and vernonia megapotamica spreng.), to describe these structures and to verify the occurrence and origin of shoot buds, and to analyse the presence of reserve substances. individuals sampled in cerrado areas in s?o paulo state showed thick underground bud-bearing organs, with adventitious or lateral roots and presence of fructans. xylopodium was found in all studied species, except for trixis nobilis, which had stem tuber. the presence of fructans as reserve, and the capacity of structures in the formation of buds indicate the potential of herbaceous species of asteraceae in forming a viable bud bank for vegetation regeneration in the brazilian cerrado.
Anatomy of the underground system in Vernonia grandiflora Less. and V. brevifolia Less. (Asteraceae)
Hayashi, Adriana Hissae;Appezzato-da-Glória, Beatriz;
Brazilian Archives of Biology and Technology , 2007, DOI: 10.1590/S1516-89132007000700009
Abstract: this work dealt with the anatomy of the underground system in vernonia grandiflora less. and v. brevifolia less. (vernonieae; asteraceae), two perennial geophytes, to elucidate their ability to sprout in the brazilian cerrado conditions. v. grandiflora, a subshrubby species, possessed a thickened underground system constituted by a xylopodium and many tuberous roots. the xylopodium had stem and root structure and its buds were axillary or originated from the cortical parenchyma proliferation. the tuberous roots produced by this organ were adventitious and accumulated inulin-type fructans mainly in the cortical parenchyma. the thickened underground system of v. brevifolia, an herbaceous species, was a tuberous primary root whose buds originated from the proliferated pericycle. the occurrence of these bud-forming underground systems, which stored reserve compounds, enabled these plants to survive throughout unfavourable environmental conditions in the cerrado, such as dry season and frequent fires in the winter.
Ultrastructural analysis of in vitro direct and indirect organogenesis
Appezzato-da-Glória, Beatriz;Machado, Silvia R.;
Brazilian Journal of Botany , 2004, DOI: 10.1590/S0100-84042004000300004
Abstract: this is a comparative study of the ultrastructural characteristics of the cells involved in the organogenesis in vitro of bauhinia forficata link (indirect system) and glycine max (l.) merrill (direct system). b. forficata calli after 30 days culture and g. max meristemoids after 10 days culture were prepared for ultrastructural analysis using conventional methods. concentrically arranged rough endoplasmic reticulum (rer) and plastids containing starch grains were seen during g. max and b. forficata organogenesis. the amitotic process, the presence of plastids around the nucleus and nuclear envelope with conspicuous pores were found in b. forficata.
Morfoanatomia dos órg?os vegetativos de Smilax polyantha Griseb. (Smilacaceae)
Martins, Aline Redondo;Appezzato-da-Glória, Beatriz;
Brazilian Journal of Botany , 2006, DOI: 10.1590/S0100-84042006000400005
Abstract: smilax polyantha griseb., known as salsaparrilha, is a medicinal plant, occurring in the "cerrado", in the southeast region in brazil. the objective of this study was to describe the morphoanatomy of the vegetative organs of smilax polyantha and to verify whether the characters described in the brazilian pharmacopoeia allow to differentiate between salsaparrilha species. samples of the vegetative organs were prepared following usual techniques using light and scanning electron microscopy. the leaf is hypostomatic and the stomata are paracytic. mesophyll tends to dorsiventral, as the three parenchyma layers near the adaxial surface are constituted by sinuous cells. petiole is canaliculated in the adaxial face, and striated in the abaxial face, indicating leaf twist. the stem branch was studied in the aerial and underground portion differing only by the thickening degree of vascular parenchyma cell walls. the rhizophore coat is made by cortical parenchyma; between the cortex and the vascular cylinder there is a secondary thickening meristem; the vascular cylinder has collateral bundles surrounded by parenchyma cells with thick secondary walls. the adventitious radicular system possesses white fresh roots, covered by epidermis, with large cortex, and rigid brown roots, covered by the sclerenchymatous cells of inner cortex, because the epidermis and outer cortex are eliminated along the development. the s. polyantha root analysis had shown that the parameters described in the brazilian pharmacopoeia, which are based on the way the roots are tied in bundles, the diameter, and colour of the roots, are insufficient to differentiate the smilax species.
Resprouting from roots in four Brazilian tree species
Hissae Hayashi,Adriana; Appezzato-da-Glória,Beatriz;
Revista de Biología Tropical , 2009,
Abstract: previous studies pointed out that species richness and high density values within the leguminosae in brazilian forest fragments affected by fire could be due, at least partially, to the high incidence of root sprouting in this family. however, there are few studies of the factors that induce root sprouting in woody plants after disturbance. we investigated the bud formation on root cuttings, and considered a man-made disturbance that isolates the root from the shoot apical dominance of three leguminosae (bauhinia forficata link., centrolobium tomentosum guill. ex benth, and inga laurina (sw.) willd) and one rutaceae (esenbeckia febrifuga (st. hil.) juss. ex mart.). all these species resprout frequently after fire. we also attempted to induce bud formation on root systems by removing the main trunk, girdling or sectioning the shallow lateral roots from forest tree species esenbeckia febrifuga and hymenaea courbaril l. we identified the origin of shoot primordia and their early development by fixing the samples in karnovsky solution, dehydrating in ethyl alcohol series and embedding in plastic resin. serial sections were cut on a rotary microtome and stained with toluidine blue o. permanent slides were mounted in synthetic resin. we observed different modes of bud origin on root cuttings: close to the vascular cambium (c. tomentosum), from the callus (b. forficata and e. febrifuga) and from the phloematic parenchyma proliferation (i. laurina). fragments of b. forficata root bark were also capable of forming reparative buds from healing phellogen formed in callus in the bark?s inner side. in the attempt of bud induction on root systems, hymenaea courbaril did not respond to any of the induction tests, probably because of plant age. however, esenbeckia febrifuga roots formed suckers when the main trunk was removed or their roots were sectioned and isolated from the original plant. we experimentally demonstrated the ability of four tree species to resprout from roots aft
Resprouting from roots in four Brazilian tree species
Adriana Hissae Hayashi,Beatriz Appezzato-da-Glória
Revista de Biología Tropical , 2009,
Abstract: Previous studies pointed out that species richness and high density values within the Leguminosae in Brazilian forest fragments affected by fire could be due, at least partially, to the high incidence of root sprouting in this family. However, there are few studies of the factors that induce root sprouting in woody plants after disturbance. We investigated the bud formation on root cuttings, and considered a man-made disturbance that isolates the root from the shoot apical dominance of three Leguminosae (Bauhinia forficata Link., Centrolobium tomentosum Guill. ex Benth, and Inga laurina (Sw.) Willd) and one Rutaceae (Esenbeckia febrifuga (St. Hil.) Juss. ex Mart.). All these species resprout frequently after fire. We also attempted to induce bud formation on root systems by removing the main trunk, girdling or sectioning the shallow lateral roots from forest tree species Esenbeckia febrifuga and Hymenaea courbaril L. We identified the origin of shoot primordia and their early development by fixing the samples in Karnovsky solution, dehydrating in ethyl alcohol series and embedding in plastic resin. Serial sections were cut on a rotary microtome and stained with toluidine blue O. Permanent slides were mounted in synthetic resin. We observed different modes of bud origin on root cuttings: close to the vascular cambium (C. tomentosum), from the callus (B. forficata and E. febrifuga) and from the phloematic parenchyma proliferation (I. laurina). Fragments of B. forficata root bark were also capable of forming reparative buds from healing phellogen formed in callus in the bark’s inner side. In the attempt of bud induction on root systems, Hymenaea courbaril did not respond to any of the induction tests, probably because of plant age. However, Esenbeckia febrifuga roots formed suckers when the main trunk was removed or their roots were sectioned and isolated from the original plant. We experimentally demonstrated the ability of four tree species to resprout from roots after disturbance. Our results suggest that the release of apical dominance enables root resprouting in the studied species. Rev. Biol. Trop. 57 (3): 789-800. Epub 2009 September 30. Estudios anteriores se alaron que la alta riqueza de especies de Leguminosae en fragmentos de bosques afectadas por el fuego podría deberse, al menos parcialmente, a la alta incidencia de brotes de raíz en esta familia. Sin embargo, existen pocos estudios. Investigamos la formación de brotes en tres Leguminosae (Bauhinia forficata Link., Centrolobium tomentosum Guill. ex Benth, e Inga laurina (Sw.) Willd) y una Ruta
Morfoanatomia da raiz tuberosa de Vernonia oxylepis Sch. Bip. in Mart. ex Baker - Asteraceae
Vilhalva, Divina Aparecida Anuncia??o;Appezzato-da-Glória, Beatriz;
Acta Botanica Brasilica , 2006, DOI: 10.1590/S0102-33062006000300009
Abstract: several native herbaceous and subshrub species native to the cerrado in brazil are geophytes, that is, they survive the unfavorable dry season and low temperatures, that sometimes coincide with fire, with only the underground system intact. vernonia oxylepis is one of these species and the aim of this study was to describe the morpho-anatomy of the tuberous root and bud formation on this structure. the main axis of this root is perpendicular to the soil surface, and from which aerial shoots arise periodically throughout the life cycle. on the upper portion of the root, self-grafting of the shoots occurs. the root stores lipids and fructans, exhibits contraction and produces reparatory buds; adventitious buds arise from proliferated pericycle. these characteristics may be related to adaptation of this species to conditions in the cerrado.
Anatomia da raiz escora de Philodendron bipinnatifidum Schott (Araceae)
Vianna, Wania de Oliveira;Soares, Marli Kasue Misaki;Appezzato-da-Glória, Beatriz;
Acta Botanica Brasilica , 2001, DOI: 10.1590/S0102-33062001000300003
Abstract: imb (philodendron bipinnatifidum), has a large distribution in brazil. it produces aerial and subterranean roots. this study presents the anatomical description of the mature prop roots and analyzes the apical root meristem region (1.0-3.0mm). the roots were brown except for the apical portion, which was white. root segments measuring 0.3cm in length were excised from aerial roots for a length of 1.2cm starting from the root tip. another 0.5cm segment from the suberized region of the root, was also excised. the segments were fixed in karnovsky solution, dehydrated in a graded ethanol series (10 to 100%), and then embedded in glycol methacrylate resin. the apical root meristem region (1.0-3.0mm), presented a many-layered root cap that consisted of sinuous anticlinal cell walls, compactly arranged. the protodermis was uniseriated. the resin ducts arose schizogenous among the fundamental meristem cells. the central cylinder exhibited conspicuous lobes. in suberized region, the epidermis was substituted by a stratified cork. the outer part of the cortex was arranged in relatively bigger intercellular spaces while the inner cortex presents 4 and 5 layers of cells arranged in radial files. the resin ducts and the secretory idioblasts occurred among cells of the cortical parenchyma. the central cylinder exhibited anomalous organization of vascular tissues with conspicuous lobes and a pith region was absent.
Comparative leaf morphology and anatomy of three Asteraceae species
Milan, Patricia;Hayashi, Adriana Hissae;Appezzato-da-Glória, Beatriz;
Brazilian Archives of Biology and Technology , 2006, DOI: 10.1590/S1516-89132006000100016
Abstract: the objective of this paper was to describe and compare the morphology and anatomy of mature leaves of mikania glomerata spreng., porophyllum ruderale cass. and vernonia condensata baker (asteraceae) species that have different habits emphasizing their secretory structures. longitudinal and transversal sections of mature leaf blades of the three species were analyzed at the apex, base, and medium third part of the midvein of the leaf blade and of the margin. m. glomerata had uniseriate glandular trichomes and secretory ducts; p. ruderale had hydathodes and secretory cavities; and v. condensata had idioblasts and uni-and biseriate glandular trichomes.
Bauhinia forficata link shoot regeneration: histological analysis of organogenesis pathway
Mello, Marcia O.;Melo, Murilo;Appezzato-da-Glória, Beatriz;
Brazilian Archives of Biology and Technology , 2000, DOI: 10.1590/S1516-89132000000400013
Abstract: plant regeneration was achieved from cells of callus induced from hypocotyl segments of bauhinia forficata on half strength murashige and skoog culture medium supplemented with several concentrations of bap. within 40 days of culture shoot buds formation was observed on callus surface. calli were then transferred to a same composition culture medium without plant growth regulator in order to induce shoot elongation. histological studies indicated that in vitro plant regeneration in b. forficata occurred through indirect organogenesis. meristemoids consisting of small cells with dense cytoplasm and prominent nuclei were randomly distributed throughout the callus surface indicating early stages of shoot bud differentiation. shoots developed de novo from superficial layers of cells and the pattern of shoot origin and development were very similar to those previously described for other leguminous species.
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