da Silva E.F.,Federal Rural University of Pernambuco |
Tabosa J.N.,Instituto Agronomico Of Pernambuco
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010
Twelve upland rice genotypes were evaluated in the 'Zona da Mata' of Pernambuco State regarding characteristics of agronomical importance. The experimental design was randomized block with four replications and plots composed of 5 rows of 4 m length and 0.5 m spacing. The experiments were carried out from April to August during the agricultural year 2006 at the Palmares and Vitoria de Santo Antão municipalities. Amongst the evaluated characteristics there were significant differences among genotypes for plant height, lodging, flowering and maturation cycle, number of tillers per plant, length of panicle, 1000-grain weight and grain yield. Genotype versus environment interaction was significant for the characteristics of plant height, flowering, cycle and percentage of spikelet sterility. The genotypes Bonança, BRA 1506, CNAs 9045 and BRSMG curinga showed better performance on plant height, lodging, flowering and maturation cycles besides good tillering per plant and average yield. Therefore, these genotypes bring a good perspective for cultivation in the region during the period of April to July.
Mergulhao A.C.E.S.,Instituto Agronomico Of Pernambuco |
Burity H.A.,Instituto Agronomico Of Pernambuco |
Goto B.T.,Federal University of Pernambuco |
Maia L.C.,Federal University of Pernambuco
Acta Botanica Brasilica | Year: 2010
The aim of this work was to evaluate the impact of gypsum mining on the occurrence and diversity of arbuscular mycorrhizal fungi (AMF). Soil samples were collected in the rainy and dry periods in four areas of a gypsum mine: native preserved "caatinga" (NC); mine vicinity (MS); reject area (RA); interface between the reject area and an area of "caatinga" degraded by mining (IN). Forty two plant species were identified in these areas; some were not found in both collection periods. Thirty six taxa of AMF were identified: 31 in the rainy and 31 in the dry period, with different species composition. Mining activity reduced diversity of plants and of AMF in the three mining areas when compared to NC. Plant similarity indexes were low between NC and the degraded areas. Similarity among AMF species was lower in the rainy period and between NC and the ones affected by mining. Glomus intraradices, Glomus sp.1 and Paraglomus occultum were the most common AMF, showing tolerance of edaphic conditions in the impacted areas. These species should be further tested in programs of revegetation of similar gypsum mining degraded areas.
Santos R.C.,Embrapa Algodao |
Rego G.M.,Embrapa Florestas |
da Silva A.P.G.,Empresa Baiana de Desenvolvimento Agropecuario |
Vasconcelos J.O.L.,Empresa Baiana de Desenvolvimento Agropecuario |
And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010
Eleven upright and runner peanut advanced lines were conducted conditions in four states located in the northeast region aiming to evaluate their pod and seed yield. Assays were carried out in the agricultural year 2005/2007 in the states of Pernambuco (Araripina and Parnamirim), Sergipe (Lagarto), Bahia (Cruz das Almas and Caetité) and Paraíba (Campina Grande and Itabaiana). A completely randomized block experimental design with five replications was used with 13 treatments (8 upright and 5 runner genotypes). The analyzed variables were pod and seed yields. Individual and joint variance analysis were carried out and Tukey (p < 0.05) test was used to compare treatments. The BR 1 cultivar was adopted as a control. The highest pod and seed yields were obtained by LN-1B, with 2,450 and 1,665 kg ha-1, respectively, overcoming the mean of upright lines in 22 and 21%, and of the BR 1 cv. in 11 and 10%. As to runner lines, the pod and seed yields were not satisfactory under the conditions, however, LI-3, LI-5 and LI-1 overcame the group, with 1,722 and 1,154 kg ha-1, corresponding to 9.8 and 10% over general mean, respectively.
Toxicity by fumigation, contact and ingestion of essential oils in Sitophilus zeamais MOTSCHULSKY, 1885 (Coleoptera: Curculionidae) [Toxicidade por fumigação, contato e ingestão de óleos essenciais para sitophilus zeamais motschulsky, 1885 (coleoptera: Curculionidae)]
Coitinho R.L.B.C.,Instituto Agronomico Of Pernambuco |
de Oliveira J.V.,University of Pernambuco |
Gondim Jr. M.G.C.,University of Pernambuco |
da Camara C.A.G.,University of Pernambuco
Ciencia e Agrotecnologia | Year: 2011
The Sitophilus zeamais species is a major pest of stored maize in Brazil. The control is made, usually, using measures of hygiene and cleanliness, synthetic insecticid es and fumigant protectors. The search for less toxic products, biodegradable and safe from an ecological point of view is very well accepted by society. The objective of this study was to test the toxicity by contact and ingestion and fumigant of essential oils and eugenol natural organic compound for adults of S. zeamais. The values of LC50 in oil from leaves of Piper hispidinervum, Eugenia uniflora, Cinnamomum zeylanicum, P. marginatum, Schinus terebinthifolius, Melaleuca leucadendron, green fruits of S. terebinthifolius and eugenol compound in tests of contact and ingestion were estimated at 1.0; 11.6, 14.2, 21.1, 57.7, 75.8, 98.8 and 14.8 L/40 g maize, respectively. The toxicity ratios (TR) ranged from 1.3 to 98.8. In the fumigation of adults, the lethal concentrations ranged from 0.53 to 94.7 L/L air, in the following order of toxicity: P. hispidinervum > P. aduncum > S. terebinthifolius > green fruits of S. terebinthifolius > P. marginatum > eugenol, and the TR ranged from 2.0 to 178.7.
Symbiotic effectiveness and competitiveness of Calopo rhizobial isolates in an Argissolo Vermelho-Amarelo under three vegetation covers in the dry forest zone of Pernambuco [Efetividade simbiótica e competitividade de rizóbios de calopogônio isolados de três coberturas vegetais, em Argissolo Vermelho-Amarelo da zona da mata Pernambucana]
Calheiros A.S.,Instituto Federal Of Alagoas |
Junior M.A.L.,University of Pernambuco |
Santos M.V.F.,University of Pernambuco |
Lyra M.C.C.P.,Instituto Agronomico Of Pernambuco
Revista Brasileira de Ciencia do Solo | Year: 2015
Biological N fixation in forage legumes is an important alternative to reduce pasture degradation, and is strongly influenced by the inoculant symbiotic capability. This paper evaluates the effectiveness of Calopo (Calopogonium mucunoides) rhizobial isolated from soil under three vegetation covers of an Argissolo Vermelho-Amarelo of the Dry Forest Zone of Pernambuco. An experiment was conducted evaluating 25 isolates, aside from 5 uninoculated controls with 0; 309; 60; 90 and 120 kg ha-1 N, and a treatment inoculated with the SEMIA 6152 strain. The first cut was performed 45 days after inoculation and a second and third cut after 45-day-intervals. Shoot N content was quantified at all cuts. Shoot dry mass was affected by N rates at all cuts. Shoot dry mass increased from the first to the second cut in inoculated plants. There was no difference between rhizobial isolates from the different plant covers for any of the variables. Most variables were significantly and positively correlated. © 2015, Revista Brasileira de Ciencia do Solo. All rights reserved.
Effect of a commercial probiotic on bacterial and phytoplankton concentration in intensive shrimp farming (Litopenaeus vannamei) recirculation systems [Efecto de un probiótico comercial sobre la concentración de bacterias y fitoplancton en cultivo de camarón (Litopenaeus vannamei) con sistemas de recirculación]
de Paiva-Maia E.,Aquarium Aquicultura |
Alves-Modesto G.,Aquarium Aquicultura |
Otavio-Brito L.,Instituto Agronomico Of Pernambuco |
Olivera A.,University of Pernambuco |
Vasconcelos-Gesteira T.C.,Federal University of Ceará
Latin American Journal of Aquatic Research | Year: 2013
The aim of this study was to evaluate the effect of a commercial probiotic on the bacterial and phytoplankton concentration in intensive shrimp farming (Litopenaeus vannamei) with a recirculation system, for one culture period in Rio Grande do Norte, Brazil. Ponds, with mean area of 2.6 ha, were stocked with a density of 98 shrimp m-2. A commercial probiotic was prepared following the manufacture's specifications and sprayed on the surface of the ponds seven days prior to stocking and then on a weekly basis until harvest. The same procedures were used with all treatments (control and probiotic), with regard to feeding, liming, fertilization, use of molasses and monitoring of water quality. Field data were analyzed using ANOVA, the Tukey test and Chi-square tests. No significant differences between treatments were found for water quality data, but treatment means showed significant differences for total heterotrophic bacteria in the sediment (5.181 ± 0.34x104 cfu g-1 and 5.749 ± 0.67x104 cfu g-1), total heterotrophic bacteria in surface water (4.514 ± 0.95x 104 cfu m L-1 and 4.136 ± 0.81x104 cfu m L-1) and positive sucrose in surface water (2.438 ± 0.72x104 cfu m L-1 and 2.203 ± 0.76x104 cfu m L-1), respectively, for the control and probiotic treatment. Significant differences were also observed throughout the weeks for total heterotrophic bacteria in the sediment, positive and negative sucrose in the sediment, total heterotrophic bacteria in surface and bottom water, and Pyrrophyta percentage values between 10 and 16 weeks. These results showed that the probiotic causes changes in the total heterotrophic bacteria in the sediment and percentage values of Pyrrophyta concentration, improving the environmental quality of the sediment and water in ponds with closed recirculation systems.
da Silva A.C.G.,Federal Rural University of Pernambuco |
Severi W.,Federal Rural University of Pernambuco |
de Castro M.F.,Instituto Agronomico Of Pernambuco
Neotropical Ichthyology | Year: 2010
The considerable similarity in the early life stages of different fish species makes egg and larvae identification in fishery biology and ichthyoplankton surveys a difficult task. Knowledge on early larval development of morphologically similar taxa and species-rich orders, such as Clupeiformes, mainly in the Neotropical fresh waters is rather limited. The aim of the present study was to describe morphological and meristic aspects of the larvae and early juveniles of Anchoviella vaillanti, an endemic species of the São Francisco River basin in Brazil. The characterization was based on an ontogenetic series of 132 individuals (1.3-51.0 mm SL). In the larval period, body varies from elongated to very elongated and the head is small, which is typical of Clupeiformes. The finfold is present beginning in the yolk-sac stage, when larvae have a large yolk sac, until the flexion stage. Pectoral fin buds are the first to form during the preflexion stage, when dorsal- and anal-fin pterygiophores and hypural bones are first visible. The total vertebra count ranges from 36 to 39 and the myomere number ranges from 31 to 45. Complete fin formation obeys the following sequence: anal and dorsal fins during flexion stage; and pectoral, pelvic and caudal fins during postflexion stage. Despite being the only freshwater clupeiform representative in the São Francisco River, A. vaillanti may occur sympatrically with A. lepidentostole in the lower stretches of the river basin. Although early larvae characteristics of A. lepidentostole are not known, its late larvae and early juveniles may be distinguished from those of A. vaillanti, by the higher number of dorsal-fin rays (15 or 16 vs. 12 or 13 in A. vaillanti), higher total vertebra count (40 vs. 37 to 40) and shorter pre-pectoral length (14 to 16 vs. 22.8 to 28.9% SL). © 2010 Sociedade Brasileira de Ictiologia.
Cavalcante M.,Federal Rural University of Pernambuco |
Lira M.A.,Instituto Agronomico Of Pernambuco
Revista Caatinga | Year: 2010
The knowledge about the magnitude of the genetic variability of collection is great importance to the success and longevity of plant breeding programs. Same authors affirm to exist genetic variability in elephant grass (Pennisetum purpureum), being expanded with the use of millet (P. glaucum) in the hybridization. This work presents considerations on genetic variability in elephant grass germplasm and the main methodologies used to assess this variability. Based on the works studied, the methodologies (principal component, canonical variables and agglomerative methods, based in the euclidian and Mahalanobis distances; Jaccard' index and cluster' methods, based in the Ney & Li distances) were efficient in to determine the genetic variability in most genotypes studies in Brazil and other countries, both biometric and molecular level, way be exploited by breeding programs through methods of selection intra and interspecific hybridizations.
Simao B.R.,Rural University |
Brito L.O.,Instituto Agronomico Of Pernambuco |
Campos Maia A.S.,São Paulo State University |
Miranda L.C.,Ufersa |
da Silveira Borges Azevedo C.M.,Ufersa
Pesquisa Agropecuaria Brasileira | Year: 2013
The objective of this work was to evaluate the performance of Pacific marine shrimp (Litopenaeus vannamei) and tilapia (Oreochromis niloticus), in a polyculture in tanks subjected to different stocking densities and feeding strategies, in comparison with monoculture. Two experiments were performed, at the same time, in a completely randomized design with three treatments and four replicates each. Treatments for experiment I were: monoculture with 10 shrimp per m2 (10S:0T); polyculture with 10 shrimp and 0.5 tilapia per m2 (10S:0.5T); and polyculture with 10 shrimp and 1 tilapia per m2 (10S:1T). Shrimp was the main crop, and feed was provided based on shrimp biomass. Treatments for experiment II were: monoculture with 2 tilapia per m2 (2T:0S); polyculture with 2 tilapia and 2.5 shrimp per m2 (2T:2.5S); and polyculture with 2 tilapia and 5 shrimp per m2 (2T:5S). Tilapia was the main crop, and feed was provided based on fish requirements. In the experiment I, tilapia introduction to shrimp culture resulted in lower shrimp growth and poor feed conversion rate. In experiment II, shrimp introduction to tilapia culture did not interfere with fish performance. Polyculture is more efficient with the combination of 2 tilapia and 2.5 or 5 shrimp per m2 and feed based on fish requirements.
PubMed | Embrapa Recursos Geneticos e Biotecnologia, Instituto Agronomico Of Pernambuco, University of Brasilia and University of Cape Town
Type: Journal Article | Journal: Genome announcements | Year: 2016
A new genomovirus has been identified in three common bean plants in Brazil. This virus has a circular genome of 2,220 nucleotides and 3 major open reading frames. It shares 80.7% genome-wide pairwise identity with a genomovirus recovered from Tongan fruit bat guano.