Burkholderia kururiensis is a diazotrophic bacterium originally isolated from polluted aquifer environment and presents high level of similarity with the rice endophyte "B. brasilensis" species. This work assessed ability B. to endophytically colonize plantlets by monitoring different tissues root-inoculated plants for presence bacterial growth in media, electron microscopy 16S rDNA analysis. Observations roots, stems leaves inoculated revealed colonization predominantly on root hair zones,...

Alchornea triplinervia (Spreng.) Müll. Arg. (Euphorbiaceae) is a tree which occurs in broad range of habitats Brazil. In the State Rio de Janeiro, it from montane forests to swamplands at sea level. A quantitative approach was used examine role light and soil water regime on variations found anatomical traits palisade spongy parenchyma, outer epidermal cell wall abaxial adaxial surfaces, percentage sclerenchymatous area relation total midrib ratio parenchyma for five distinct ecological...

Lianas são importantes componentes estruturais das florestas tropicais, apesar disso a anatomia destes vegetais é pouco estudada. A família Leguminosae relatada como segunda maior em número de espécies lianas, contudo se conhece da diversidade anatômica lianas desta família. O presente estudo descreveu e analisou do lenho oito Leguminosae, ocorrentes no Parque Nacional Itatiaia, localizado Estado Rio Janeiro, região Sudeste Brasil, local inserido bioma Floresta Atlântica. As apresentaram...

Premise of research. This study tackles the general question whether assessment leaf anatomical characters has potential utility in characterizing clades and taxa at various levels taxonomic hierarchy Primulaceae.Methodology. Fully expanded field-collected leaves 33 species from five genera were sampled. The material was subjected to procedures by LM, SEM, confocal microscopy, epifluorescence microscopy. Principal component analyses performed test validity features as a method separating...

Simira is a predominantly woody Neotropical genus comprising 41 taxa, 16 of which occur in Brazil and eight them the southeastern region Brazil. Leaf blades eliezeriana Peixoto, S. glaziovii (K. Schum.) Steyem., grazielae pikia Steyerm., rubra (Mart.) sampaioana (Standl.) Steyerm. were collected fixed according to usual methods for light electron microscopy. The leaf show typical characteristics Rubiaceae family as dorsiventral mesophyll paracytic stomata. presence two bundle sheaths that...

Abstract We evaluated the effect of temperature regimes (six constant and four alternating temperatures), light qualities (five red : far ratios) water potentials (ΨW; seven NaCl polyethylene glycol 6000 [PEG] solutions) on percentage germination rate, as well post‐seminal development morphology, that allow Pilosocereus arrabidae seeds to germinate in a hot semiarid climate south‐eastern Brazilian coast. The results showed germinated similarly between temperatures, with an optimal at 25/20°C...

Cambial activity and the formation of secondary xylem were investigated in main stem three arboreal leguminous species one liana. To compare seasonal vascular cambium behavior these species, two methods concurrently applied: induction injury anatomical analysis adjacent zones (differentiation zone). One tree Pseudopiptadenia contorta (DC.) G.P.Lewis & M.P.Lima, was sampled forest formations: alluvial, submontane, montane. Two more Apuleia leiocarpa (Vogel) J.F.Macbr. leptostachya...

Secretory structures are an outstanding feature in Primulaceae (Ericales). Such known for their taxonomical and medicinal importance. However, a detailed morphological study of the secretory has been neglected. Selected species this belong to Myrsine, widely distributed genus Brazil, popularly as “capororoca”. In study, we aimed elucidate ontogenesis leaves Myrsine coriacea (Sw.) R. Br. ex Roem & Schult. venosa A.DC. report, first time, on composition essential oils. The following found...

Abstract In this work we explore the radiocarbon ( 14 C) signal as an independent tool to assess year of formation individual tree rings tropical species in northern Brazil. Three different were analyzed work: Dipteryx magnifica , Enterolobium maximum and Hymenolobium petraeum . The studied samples are from stem only one each species, all cut down 2008 Porto Trombetas, Pará, Individual identified based on wood anatomy they counted bark pith. Several selected for C analysis order cover...

The tree Piptadenia gonoachantha is widely used in forestry and forest restoration projects, which require methods for evaluating growth. Long-term studies are necessary to determine patterns detect changes species growth rhythms. Tree ring analysis provides a precise method determining age documenting long-term trends tropical species. present study evaluated the periodicity of formation radial dynamics P. from population known Poço das Antas Biological Reserve. Two radii six trees were...

The rapid urbanization process in recent decades has altered the carbon cycle and exacerbated impact of climate change, prompting many cities to develop tree planting green area preservation as mitigation adaptation measures. While numerous studies have estimated stocks urban trees temperate subtropical cities, data from tropical regions, including botanic gardens, are scarce. This study aimed quantify aboveground biomass (AGB AGC, respectively) at Rio de Janeiro Botanical Garden arboretum,...

Secretory structures are formed by many types of plants and present on numerous different organs. Among the known secretory structures, colleters predominant Rubiaceae. One remarkable characteristic tissues is export exudates; however, precise mechanism involved in this process still unclear. To better understand mechanisms exudate externalization it necessary to ultrastructure dynamics outer cell wall during process, so we investigated these aspects Bathysa nicholsonii. The (OCW) exhibits...

Anatomical studies were performed here in order to provide diagnostic characteristics differentiate the species Stylogyne depauperata, S. pauciflora, sordida and warmingii. Fully expanded leaves processed by usual techniques of optical microscopy scanning electron microscopy. Traits common all observed, such as dorsiventral mesophyll, unistratified epidermis, anisocytic stomata, druses secretory cavities distributed throughout mesophyll. Cuticular ornamentation, configuration vascular system...

Baccharis L. is an important genus in the high-altitude environments of South America. In State Rio de Janeiro, southeastern Brazil, greatest richness found at montane and high-montane ecological refuges, known as grasslands. The high altitude provides several environmental factors that turn grasslands into singular tropical habitats. this article we describe leaf anatomy six shrubby species Baccharis, pointing out aspects structures, testing use statistical analyses to compare species....

Fire disturbance affects the composition, structure and dynamics of vegetation. Historical records fire events exist in some places, but they are generally limited temporal spatial extent. Tree-ring research is a useful tool for history reconstruction can contribute important long-term ecological data. We tested hypotheses that Moquiniastrum polymorphum (Less.) G. Sancho, widespread species Brazil occurs burnt areas Atlantic Forest, produces annual growth rings its wood record incidence by...

Colleters are secretory structure present on many families including Rubiaceae. Particular characteristics have been described about colleters cells, however senescence process still under debate. Tocoyena bullata (Vell.) Mart. (Rubiaceae) shoot apex were collected at Jardim Botânico do Rio de Janeiro, RJ/Brazil. Stipules separated and fragments fixed in 2.5% glutaraldehyde 4.0% formaldehyde 0.05 m sodium cacodylate buffer, pH 7.2, post 1.0% osmium tetroxide the same dehydrated acetone,...