Rio Of Janeiro Botanical Garden Research Institute
Rio Of Janeiro Botanical Garden Research Institute
Souza D.T.,Environmental Microbiology Laboratory |
Souza D.T.,University of Sao Paulo |
Genuario D.B.,Environmental Microbiology Laboratory |
Silva F.S.,Environmental Microbiology Laboratory |
And 8 more authors.
FEMS microbiology ecology | Year: 2017
Bacterial communities associated with sponges are influenced by environmental factors; however, some degree of genetic influence of the host on the microbiome is also expected. In this work, 16S rRNA gene amplicon sequencing revealed diverse bacterial phylotypes based on the phylogenies of three tropical sponges (Aplysina fulva, Aiolochroia crassa and Chondrosia collectrix). Despite their sympatric occurrence, the studied sponges presented different bacterial compositions that differed from those observed in seawater. However, lower dissimilarities in bacterial communities were observed within sponges from the same phylogenetic group. The relationships between operational taxonomic units (OTUs) recovered from the sponges and database sequences revealed associations among sequences from unrelated sponge species and sequences retrieved from diverse environmental samples. In addition, one Proteobacteria OTU retrieved from A. fulva was identical to sequences previously reported from A. fulva specimens collected along the Brazilian coast. Based on these results, we conclude that bacterial communities associated with marine sponges are shaped by host identity, while environmental conditions seem to be less important in shaping symbiont communities. This is the first study to assess bacterial communities associated with marine sponges in the remote St. Peter and St. Paul Archipelago using amplicon sequencing of the 16S rRNA gene. © FEMS 2016. All rights reserved. For permissions, please e-mail: email@example.com.
Martins E.,Rio Of Janeiro Botanical Garden Research Institute |
Loyola R.,Rio Of Janeiro Botanical Garden Research Institute |
Loyola R.,Federal University of Goais |
Martinelli G.,Rio Of Janeiro Botanical Garden Research Institute
Annals of the Missouri Botanical Garden | Year: 2017
Brazil holds the largest flora in the world, with more than 35,000 described native species. However, a large portion of its flora is poorly known, and more than 2000 species are threatened with extinction. Because similar situations exist in virtually all other countries, the United Nations' Convention on Biological Diversity launched a program called the Global Strategy for Plant Conservation (GSPC). The vision of GSPC is to halt the continuing loss of plant diversity through the achievement of 16 outcome-oriented global targets set for 2020. Here we discuss the challenges ahead for countries committed to achieving GSPC targets and use the experience of the National Centre for Flora Conservation (CNCFlora), in Brazil, as a case study of successes in pursuing some targets, and some perceived failures. We offer information that might help other countries, decision makers, and policymakers to address difficulties and move themselves toward achieving GSPC targets. We also synthesize the main targets upon which CNCFlora acts, their current situation, and the desired improvements necessary to achieve targets by 2020. Finally, we provide recommendations to actors, stakeholders, decision makers, and policymakers in Brazil that could foster conservation actions and strategies in the country.
Bahia R.G.,Rio Of Janeiro Botanical Garden Research Institute |
Riosmena-Rodriguez R.,Autonomous University of Baja California Sur |
Maneveldt G.W.,University of the Western Cape |
Amado Filho G.M.,Rio Of Janeiro Botanical Garden Research Institute
Phycological Research | Year: 2011
Samples corresponding to Sporolithon ptychoides Heydrich were collected in the mesophotic zone (50 m depth) south of Espírito Santo State, Brazil. The collected material presented features characteristic of the species, namely: tetrasporangia of 75-105 × 40-55 μm grouped into sori that are raised above the surrounding vegetative thallus surface; presence of a basal layer of elongate cells in areas where the tetrasporangia develop; presence of buried tetrasporangial compartments deep in the thallus; and 3-5 cells in the tetrasporangial paraphyses. These same features said to collectively characterize S. ptychoides, were all observed in a representative specimen and the type specimen of Sporolithon dimotum (Foslie & Howe) Yamaguishi-Tomita ex M.J Wynne. This latter species is thus conspecific with S. ptychoides and is therefore considered a heterotypic synonym thereof, as S. ptychoides has nomenclatural priority. This study expands the known geographical distribution of the species and may give insight into the origin of the species into other geographical regions. © 2010 Japanese Society of Phycology.
Rajput K.S.,Rio Of Janeiro Botanical Garden Research Institute |
Rajput K.S.,M. S. University of Baroda |
Nunes O.M.,Rio Of Janeiro Botanical Garden Research Institute |
Brandes A.F.N.,Rio Of Janeiro Botanical Garden Research Institute |
And 2 more authors.
Flora: Morphology, Distribution, Functional Ecology of Plants | Year: 2012
The occurrence of flattened stems in Rhynchosia phaseoloides (SW.) DC. (Fabaceae) has been known for years, but little interest has been shown toward elucidating its secondary growth. This study aims to (1) understand the pattern of secondary growth and development of vascular elements from the cambium at different stages of stem growth and (2) elucidate the type, size and distribution of cells related to these processes at different regions of the stem. Dilatation growth in main stems and branches of R. phaseoloides is achieved by successive cambia formed in two areas of the actual cortex that are opposed to each other by approximately 180°. Only the first cambial ring is functionally normal and closed-elliptical in outline, supporting the growth of the middle part of the rather flat stem. Later on, this stem becomes oval to oblong in cross-section outline by the activity of successive cambia from which cells produce further xylem, phloem and parenchyma tissues in a somewhat fan-shaped way. As shown in cross section, a flat cable-like structure of several modules results, forming wings relative to the primary central axis tissues. The secondary cambia are formed by dedifferentiation of cortical parenchyma cells, resulting in small clusters of radially arranged meristematic bands of cells. From these meristematic bands, an outward-facing crescent-shaped new band of cambium is originated. The innermost cells of this meristematic band form the parenchymatic tissue that connects the new lateral module to the proximal one. This occurs several times during the whole stem ontogeny. © 2012 Elsevier GmbH.