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Search Results: 1 - 10 of 27138 matches for " Adriana U.;Dornelas "
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Lima beans production and economic revenue as function of organic and mineral fertilization
Alves, Adriana U;Oliveira, Ademar P de;Alves, Anarlete U;Dornelas, Carina SM;Alves, Edna U;Cardoso, Edson A;Oliveira, Arnaldo Nonato P de;Cruz, Iordan da S;
Horticultura Brasileira , 2008, DOI: 10.1590/S0102-05362008000200024
Abstract: lima beans (phaseolus lunatus l.) are alternative food and income sources for the population of northeastern brazil. in this region, lima beans are consumed either as green or dry grains. however, low yields have been observed, a challenge that could be overcome by adequate organic and mineral fertilization. this work intended to assess lima beans yield, cultivar raio de sol, as affected by doses of cattle manure in the presence and absence of mineral npk fertilization. the experiment was carried out at the federal university of paraíba, brazil, from september, 2004 to may, 2005. the experimental design was of randomized blocks, with four replications, 40-plant plots, spaces of 1.00 x 0.50 between and within rows, respectively. treatments were displayed in a 6 x 2 factorial, corresponding to manure doses (0, 10, 20, 30, 40 and 50 t ha-1) and presence and absence of npk. green and dry grain, and pod yields were analysed, as well as the economic revenue for pods and dry grains. to measure the economic efficiency, pods and dry grains were employed as the exchange units. maximum pod yields (12.6 and 11.2 t ha-1) were achieved with 21.4 and 23 t ha-1 of manure, with and without npk, respectively. highest green grain yields (11.1 and 9.9 t ha-1) were obtained with 21.3 and 22.9 t ha-1 of manure, with and without npk, respectively. the highest yield of dry grains (3.5 t ha-1) was obtained with 26.6 t ha-1 of manure combined with npk. in the absence of npk, the use of cattle manure resulted in an average dry grain yield of 2.0 t ha-1. the maximum economic efficiency for pod production was reached with 17 and 18.6 t ha-1 of manure, with predicted net incomes of 2.88 and 3.36 t ha-1 of pods, in the presence and absence of npk, respectively. for dry grains, the maximum economic efficiency was achieved with 23 t ha-1 of manure, in the presence of npk, which produced a net revenue of 2.12 t ha-1 of dry grains.
Produ??o de feij?o-fava em fun??o do uso de doses de fósforo
Oliveira, Ademar P. de;Alves, Edna U.;Alves, Adriana U.;Dornelas, Carina S.M.;Silva, Jandiê A. da;P?rto, M?nica L.;ALves, Amarlete V.;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000300008
Abstract: phosphorus is an important mineral nutrient for vegetables. this work was conducted at universidade federal da paraíba, in areia, brazil, from december/2001 to july/2002, aiming to evaluate the effect of levels of p2o5 on the yield of lima bean, cv. "orelha de vó". the experimental design was a randomized block with five treatments (0; 100; 200; 300; 400 and 500 kg ha-1 of p2 o5), and four replications. each plot consisted of 40 plants spaced 1.0 m between rows and 0.50 m between plants in each row. the estimated maximum yield of green and dry beans (5.2 and 2.7 t ha-1, respectively) corresponded, to the dosages of 309 and 302 kg ha-1 of p2o5. the levels 291 kg ha-1 and 281 kg ha-1 of p2o5 provided, respectively, the greater economic return for the yield of green (4.1 t ha-1) and dry (1.8 t ha-1) beans. the most economic levels included more than 80% of those dosages responsible for the maximum yields and indicated the economic viability of phosphorus utilization on lima bean crop. the p2o5 levels which promoted the maximum yield and the maximum economic return for green and dry beans yield were respectively, with 57.1; 56.3; 55.0 and 53.8 mg dm-3 of available p for the extractor of melich 1. the lima bean response to the phosphorus fertilization in soils with similar fertility used in the present study, for green and dry beans yield, will be reduced at levels of available p superior to 55.0 and 53.8 mg dm-3. the average concentration of p in the leaves of lima bean, 120 days after sowing, in function of levels of p2o5 was of 3.4 g kg-1. for the soil of this study the application of 291 and 281 kg ha-1 of p2o5 is more recommended to establish the lima bean respectively, for green and dry beans yield.
Resposta do quiabeiro às doses de fósforo aplicadas em solo arenoso
Oliveira, Ademar P. de;Dornelas, Carina Seixas M.;Alves, Adriana U.;Alves, Anarlete U.;Silva, Jandiê Araújo da;Oliveira, Arnaldo Nonato P. de;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000200010
Abstract: the influence of phosphorus fertilization on yield of okra, cv. santa cruz was evaluated. the research was carried out in the experimental design of randomized blocks, with five treatments (0; 44; 88; 132 and 176 kg ha-1 of p), and four replications. the maximum number of fruits per plant (43) was obtained with the maximum level of 176 kg ha-1 of p. the estimated maximum yield of commercial fruits (38.6 t ha-1), was related to 139 kg ha-1 of p. the application of 137 kg ha-1 of p provided the highest economical income, yielding 38.3 t ha-1 of commercial fruits, with an increment of fruits of 17.4 t ha-1. the most economic level represented 98% of that responsible for the maximum yield, indicating that the okra responded economically to the use of p in sandy soil and, of the p level responsible for the maximum commercial yield of fruits were related to 40 mg dm-3 of available p in soil (mehlich 1), and the level responsible for the highest economic income was related to 38 mg dm-3.
Produ??o de batata-doce adubada com esterco bovino em solo com baixo teor de matéria organica
Santos, Jo?o F dos;Oliveira, Ademar P de;Alves, Adriana U;Brito, Carlos H de;Dornelas, Carina SM;Nóbrega, José PR;
Horticultura Brasileira , 2006, DOI: 10.1590/S0102-05362006000100021
Abstract: the influence of organic fertilization on total and commercial production of sweet potato roots, rainha branca cv. was evaluated. the experiment was carried out from june to october/2004, in paraiba state, brazil. the experimental design was of randomized blocks with six treatments (0; 10; 20; 30; 40 and 50 t ha-1 of cattle manure), in four replications. the total and commercial productions of sweet potato roots were 18.5 and 14.2 t ha-1 obtained with 32 and 30 t ha-1 of cattle manure. the cattle manure level responsible for maximum economic return of commercial roots (30 t ha-1), was equal to that which allowed maximum production, represented 100% of maximum technique efficiency, constituting an indicative of the economic viability of cattle manure application in sweet potato. the estimated cattle manure levels which resulted maximum production and economic returns for commercial roots, corresponded to 13.8 g kg-1 of remaining organic matter with the extractor. in similar soils of this study, the organic fertilization for sweet potato production can be dispensed, with remaining organic matter level higher than 13.8 g kg-1 of soil.
A Floricaula/Leafy gene homolog is preferentially expressed in developing female cones of the tropical pine Pinus caribaea var. caribaea
Dornelas, Marcelo Carnier;Rodriguez, Adriana Pinheiro Martinelli;
Genetics and Molecular Biology , 2005, DOI: 10.1590/S1415-47572005000200021
Abstract: in angiosperms, flower formation is controlled by meristem identity genes, one of which, floricaula (flo)/leafy (lfy), plays a central role. it is not known if the formation of reproductive organs of pre-angiosperm species is similarly regulated. here, we report the cloning of a conifer (pinus caribaea var. caribaea) flo/lfy homolog, named pclfy. this gene has a large c-terminal region of high similarity to angiosperm flo/lfy orthologs and shorter regions of local similarity. in contrast to angiosperms, conifers have two divergent genes resembling lfy. gymnosperm flo/lfy proteins constitute a separate clade, that can be divided into two divergent groups. phylogenetic analysis of deduced protein sequences has shown that pclfy belongs to the lfy-like clade. northern hybridization analysis has revealed that pclfy is preferentially expressed in developing female cones but not in developing male cones. this expression pattern was confirmed by in situ hybridization and is consistent with the hypothesis of pclfy being involved in the determination of the female cone identity. additionally, mutant complementation experiments have shown that the expression of the pclfy coding region, driven by the arabidopsis lfy promoter, can confer the wild-type phenotype to lfy-26 transgenic mutants, suggesting that both gymnosperm and angiosperm lfy homologs share the same biological role.
Identifying Eucalyptus expressed sequence tags related to Arabidopsis flowering-time pathway genes
Dornelas, Marcelo Carnier;Rodriguez, Adriana Pinheiro Martinelli;
Brazilian Journal of Plant Physiology , 2005, DOI: 10.1590/S1677-04202005000200009
Abstract: flowering initiation depends on the balanced expression of a complex network of genes that is regulated by both endogenous and environmental factors. the timing of the initiation of flowering is crucial for the reproductive success of plants; therefore, they have developed conserved molecular mechanisms to integrate both environmental and endogenous cues to regulate flowering time precisely. extensive advances in plant biology are possible now that the complete genome sequences of flowering plants is available and plant genomes can be comprehensively compared. thus, association studies are emerging as powerful tools for the functional identification of genes involved on the regulation of flowering pathways. in this paper we report the results of our search in the eucalyptus genome sequencing project consortium (forests) database for expressed sequence tags (ests) showing sequence homology with known elements of flowering-time pathways. we have searched the 33,080 sequence clusters in the forests database and identified eucalyptus sequences that codify putative conserved elements of the autonomous, vernalization-, photoperiod response- and gibberellic acid-controlled flowering-time pathways. additionally, we have characterized in silico ten putative members of the eucalyptus homologs to the arabidopsis constans family of transcription factors.
A genomic approach to elucidating grass flower development
Dornelas, Marcelo C.;Rodriguez, Adriana P.M.;
Genetics and Molecular Biology , 2001, DOI: 10.1590/S1415-47572001000100011
Abstract: in sugarcane (saccharum sp) as with other species of grass, at a certain moment of its life cycle the vegetative meristem is converted into an inflorescence meristem which has at least two distinct inflorescence branching steps before the spikelet meristem terminates in the production of a flower (floret). in model dicotyledonous species such successive conversions of meristem identities and the concentric arrangement of floral organs in specific whorls have both been shown to be genetically controlled. using data from the sugarcane expressed sequence tag (est) project (sucest) database, we have identified all sugarcane proteins and genes putatively involved in reproductive meristem and flower development. sequence comparisons of known flower-related genes have uncovered conserved evolutionary pathways of flower development and flower pattern formation between dicotyledons and monocotyledons, such as some grass species. we have paid special attention to the analysis of the mads-box multigene family of transcription factors that together with the apetala2 (ap2) family are the key elements of the transcriptional networks controlling plant reproductive development. considerations on the evolutionary developmental genetics of grass flowers and their relation to the abc homeotic gene activity model of flower development are also presented.
A genomic approach to elucidating grass flower development
Dornelas Marcelo C.,Rodriguez Adriana P.M.
Genetics and Molecular Biology , 2001,
Abstract: In sugarcane (Saccharum sp) as with other species of grass, at a certain moment of its life cycle the vegetative meristem is converted into an inflorescence meristem which has at least two distinct inflorescence branching steps before the spikelet meristem terminates in the production of a flower (floret). In model dicotyledonous species such successive conversions of meristem identities and the concentric arrangement of floral organs in specific whorls have both been shown to be genetically controlled. Using data from the Sugarcane Expressed Sequence Tag (EST) Project (SUCEST) database, we have identified all sugarcane proteins and genes putatively involved in reproductive meristem and flower development. Sequence comparisons of known flower-related genes have uncovered conserved evolutionary pathways of flower development and flower pattern formation between dicotyledons and monocotyledons, such as some grass species. We have paid special attention to the analysis of the MADS-box multigene family of transcription factors that together with the APETALA2 (AP2) family are the key elements of the transcriptional networks controlling plant reproductive development. Considerations on the evolutionary developmental genetics of grass flowers and their relation to the ABC homeotic gene activity model of flower development are also presented.
EgLFY, the Eucalyptus grandis homolog of the Arabidopsis gene LEAFY is expressed in reproductive and vegetative tissues
Dornelas, Marcelo Carnier;Amaral, Weber A. Neves do;Rodriguez, Adriana Pinheiro Martinelli;
Brazilian Journal of Plant Physiology , 2004, DOI: 10.1590/S1677-04202004000200006
Abstract: the eglfy gene cloned from eucalyptus grandis has sequence homology to the floral meristem identity gene leafy (lfy) from arabidopsis and floricaula (flo) from antirrhinum. eglfy is preferentially expressed in the developing eucalypt floral organs in a pattern similar to that described previously for the arabidopsis lfy. in situ hybridization experiments have shown that eglfy is strongly expressed in the early floral meristem and then successively in the primordia of sepals, petals, stamens and carpels. it is also expressed in the leaf primordia of adult trees. the expression of the eglfy coding region under control of the arabidopsis lfy promoter could complement strong lfy mutations in transgenic arabidopsis plants. these data suggest that eglfy plays a similar role to lfy in flower development and that the basic mechanisms involved in flower initiation and development in eucalyptus may be similar to those occurring in arabidopsis.
From leaf to flower: revisiting Goethe's concepts on the ¨metamorphosis¨ of plants
Dornelas, Marcelo Carnier;Dornelas, Odair;
Brazilian Journal of Plant Physiology , 2005, DOI: 10.1590/S1677-04202005000400001
Abstract: goethe?s seminal scientific work, versuch die metamorphose der pflanzen zu erklaren (an attempt to interpret the metamorphosis of plants) dated from 1790, has created the foundations for many domains of modern plant biology. the archetypal leaf concept, which considers floral organs as modified leaves, besides being the best known has been proven true, following the description of the abc molecular model of floral organ identity determination during the last decade. here we analyze the whole theoretical frame of goethe?s 1790 publication and present two previously misconsidered aspects of this work: the "refinement of the sap" concept as a directional principle and the "cycles of contractions and expansions" as cycles of differential determination of the shoot apical meristem. the reinterpretation of these concepts are in line with the modern view that molecular networks integrate both environmental and endogenous cues and regulate plant development. this reassessment also helps to elaborate a theoretical frame that considers the evolutionary conservation of the molecular mechanisms that regulate plant development.
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