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Search Results: 1 - 10 of 52119 matches for " Petterson Baptista da;Lessa "
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Diferentes substratos e ambientes para enraizamento de mini-ixora (Ixora coccinea 'Compacta')
Almeida, Elka Fabiana Aparecida;Luz, Petterson Baptista da;Lessa, Marília Andrade;Paiva, Patrícia Duarte de Oliveira;Albuquerque, Carlos Juliano Brant;Oliveira, Marcus Vanner Carvalho de;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000500014
Abstract: the mini-ixora (ixora coccinea 'compacta') is a species highly appreciated for use in tropical gardens. its propagation is made by cutting, however, its rooting percentage is very low so, the aim of this work was to evaluate substrates and environments for the mini-ixora rooting. apical cuttings with 10 cm of length were used in two substrates: sand and plantmax?. three rooting environments were used: wet chamber, greenhouse and conventional rooting (shade cloth with 50% of shade). the experiment was carried out by using split plots with three different environments in the main plot and two substrates in the subplots. one also used five replications and ten cuttings per plot. analyzing the results one hundred days after the experiment implantation one noticed that the sand had proportioned higher percentage of rooting (68%) compared to plantmax (48%). the wet chamber also was the environment that provided better conditions for the propagation of the mini-ixora, with the highest percentage of rooting, 98%, compared to the greenhouse, 66% and to the conventional rooting, 10%. moreover, sand and wet chamber also provided a better root quality. one concluded that the best substrate for mini-ixora propagation was sand and the cuttings should be placed in the wet chamber.
Genetic Correlation between Agronomically Important Traits in Yellow Passion Fruit  [PDF]
Leonarda Grillo Neves, Claudio Horst Bruckner, Marcelo Coutinho Pican?o, Severino de Paiva Sobrinho, Kelly Lana Araújo, Petterson Baptista da Luz, Marco Antonio Aparecido Barelli, Willian Krause
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.411262
Abstract:

Breeding programs have sought to determine the minimum period of genotype evaluation, which is a long term-process. The objective of this work was to determine the association between qualitative traits of yellow passion fruit (Passiflora edulis Sims) and relate maturity to other characteristics. To carry out this work, 113 families of full-sibs and half-sibs were planted in Viçosa (MG), Brazil, in a randomized block experimental design arranged in sets (treatment groups). The association between the analyzed characteristics was studied using path analysis and canonical correlation techniques. It was found that lower-yielding but larger-fruit bearing genotypes of passion fruit plant also require more days until reaching anthesis. Round-shaped fruits are linked to higher contents of total soluble solids. More intense pulp color also indicates higher contents of total soluble solids. The riper the fruit, the more intensely orange is the color of the pulp. The ratio between the levels of total soluble solids and total titrimetric acidity was the main determinant of pulp color

Influência de diferentes tipos de estacas e substratos na propaga??o assexuada de hortênsia [Hydrangea macrophylla (Thunb.) Ser.]
Luz, Petterson Baptista da;Paiva, Patrícia Duarte de Oliveira;Landgraf, Paulo Roberto Corrêa;
Ciência e Agrotecnologia , 2007, DOI: 10.1590/S1413-70542007000300015
Abstract: the hydrangea (hydrangea macrophylla) is a semi-ligneous shrub measuring 1.0m to 2.5m in height with decorative foliage and flat-topped or rounded clusters of white, pink, or blue flowers widely used as vase or pot flower as well as landscaping plant. the objective of this research work was to study the rooting of stem cuttings obtained from three different parts of the plant: apical, median and basal portions of the stems, in three different types of substrate: soil, sand and vermiculite, for production of new cuttings. the stems were cut from the mother plants and subdivided into apical, median and basal segments, which were then placed for rooting in styrofoam trays containing the three different substrates soil, sand, and vermiculite and arranged inside a growth chamber containing nebulization. the cuttings that presented the best root quality were the ones originated from the basal portion of the stem and sand was the substrate that provided best rooting. the cuttings obtained from the different parts of the plant did not differ as far as percent of rooting and number of sprouts formed are concerned. on the other hand, the substrates that provided highest number of sprouts were sand and soil. some cuttings presented flower formation, with higher frequency on the cuttings from the apical segment, with no effect from substrate. sand was the substrate that provided the best results concerning quality of roots and rooting percentage. the soil substrate was superior only for the number of sprouts per cutting although it was not statistically different from the substrate sand. transplants originated from cuttings of the basal portion of the stem were qualitatively superior.
Caracteriza o morfológica do diásporo e da plantula de Archontophoenix cunninghamii (Arecaceae)
Petterson Baptista da Luz,Kathia Fernandes Lopes Pivetta,Leonarda Grillo Neves,Severino de Paiva Sobrinho
Comunicata Scientiae , 2012,
Abstract: A palmeira Archontophoenix cunninghamii H.Wendl. & Drude, embora muito utilizada no paisagismo ainda é pouco estudada. De maneira geral, os trabalhos sobre morfologia de sementes e plantulasde espécies de Arecaceae s o escassos, desta forma, este trabalho teve como objetivo descrever a morfologia do diásporo e da plantula desta espécie. As sementes de A. cunninghamii têm forma arredondada e endosperma ruminado e consistência dura. O embri o é periférico e relativamente indiferenciado; com aproximadamente 4 mm de comprimento, de forma c nica, com uma das extremidades c ncava no interior da qual se encontra uma pequena protuberancia e a outraextremidade é arredondada e mais afilada. A germina o é adjacente ligulada e hipógea, sendo que o desenvolvimento se inicia a partir de uma massa de células indiferenciadas na depress o micropilar, a diferencia o dos primórdios caulinares e radiculares, sendo o primeiro envolto por uma bainha fechada. O sistema radicular é fasciculado, com raízes adventícias diferenciadas e várias raízes laterais, com poucos pelos absorventes. O primórdio caulinar é constituído por três bainhas que envolvem a primeira folha jovem, as quais se abrem, sucessivamente, permitindo a emergência da folha primária bífida, com nervuras paralelas típicas.
Genetic Divergence in Mango and Obtaining Minimum Efficient Descriptors  [PDF]
Sandra da Costa Preisigke, Adryellison Lemes de Campos, Nadsley Seraglio Souza, Leonarda Grillo Neves, Marco Antonio Aparecido Barelli, Petterson Baptista da Luz, Kelly Lana Araújo, Severino de Paiva Sobrinho
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412287
Abstract:

Mangifera indica (mango) is a typically tropical fruit with considerable economic value. Brazil features a wide variety of cultivars of this fruit, most of which are known under several different names. Indeed, the nomenclature of mango varieties is still quite confusing. Up to now there has been no well-defined scientific principle to differentiate them. The objective of the present work is to compare the different clustering methods in assessing genetic divergence among mango accessions, as well as identify the minimum efficient descriptors for that crop. A total of 20 mango accessions in Cáceres, Mato Grosso state, Brazil were evaluated. When building dissimilarity matrices, the descriptors were divided according to the following groups: leaf, flower/inflorescence, fruit, seed and growth habit/ripening period. With these divisions, combinations were performed among the groups of descriptors. The similarity index was used to obtain the dissimilarity matrices. Later, the accessions were clustered using the methods of Tocher, Ward and UPGMA. The study observed that it was possible to reduce the number of descriptors from 64 to 35, and that the clustering methods were compatible with the study of the genetic diversity of mango.

Desenvolvimento de Rhapis excelsa (Thunberg) Henry Ex. Rehder (Palmeira-Ráfia): Influência da altura do recipiente na forma??o de mudas
Luz, Petterson Baptista da;Aguiar, Francismar Francisco Alves;Tavares, Armando Reis;Kanashiro, Shoey;Aguiar, Janaina;Nascimento, Thais Denise Rodrigues do;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000100004
Abstract: rhapis excelsa is one the most important ornamental palm cultivated in the world, mainly as vase plant, being indigenous to china. the aim of this research was to investigate the influence of vase height on the development of the species. two years-old seedlings with 10 cm height and 10 cm root system length were transplanted to pvc containers with 10 cm diameter and 20, 25, 30, 35 and 40 cm height. the vase substratum was a mixture of pine bark, vermiculite and soil (2:1:1), fertilized with 45 g of osmocote (15:10:10). the evaluated parameters were: plant height, stem based diameter, number of leaves and numbers of shoots, at 06, 12 and 18 months after the beginning of the experiment. for 18 months plants, the foliar dry matter weight and the roots dry matter weight were also evaluated. the experimental design was completely randomized with five replicates and each experimental unit was composed of 2 plants. there was a significant difference for the parameter plants height at 6 months, and the 40 cm height container presented the worst results. there was no significant difference among the treatments at 12 months since transplantation. after 18 months, there were significant differences among the treatments for the parameters plant height and diameter of the lap, with plant height being lower for the 40 cm container than other treatments and the diameter of the lap being greater for 25 cm container. the use of 25 cm height containers was interesting because of the quality of the grown plants and in relation to the economical aspects of the production.
Germina??o de sementes de dalbergia nigra (Vell.) Allemao ex Benth. (Fabaceae-Papilionoideae) no armazenamento
Aguiar, Francismar Francisco Alves;Tavares, Armando Reis;Kanashiro, Shoey;Luz, Petterson Baptista da;Santos Júnior, Nelson Augusto dos;
Ciência e Agrotecnologia , 2010, DOI: 10.1590/S1413-70542010000700006
Abstract: dalbergia nigra (vell.) allemao ex benth. (brazilian rosewood) is a highly economically valuable species because of its wood quality and ornamental potential, mainly due to its well formed canopy and the delicacy of its foliage. unfortunately, these features contributed to list it as an endangered brazilian species (ibama regulation number 06/92). this work had as its objective to study the quality of dalbergia nigra seeds submitted to increasing storage periods. fruits from trees located at the botanical institute of sao paulo were collected in october 2003. after harvested, the fruits were sun dried and the seeds manually separated. the seeds were stored in closed transparent plastic bags under refrigeration (6o c ± 2). monthly, during 690 days, 200 seeds were removed from the refrigerator. one hundred (100) seeds were used in germination tests, which consisted of four repetitions with 25 seeds each; and the other 100 were used in the determination of water content. the germination tests were conducted in a b.o.d. chamber at 25o c under a 12 hour photoperiod. the analyzed variables were; the germination percentage, germination velocity index, and dry mass of the seedlings. the results indicated that after 360 days of storage, the seeds showed germination percentage close to 50% and reduction of the germination velocity index to half, whereas the dry mass accumulation was the most compromised. the initial and final germination percentages were 87% and 36%, respectively. we concluded that dalbergia nigra seeds present orthodox behavior and can be stored for a period of approximately two years in plastic bags at low temperature, compromising 50% of their germination capacity.
Germina??o de sementes de Dypsis decaryi (Jum.) Beentje & J. Dransf. (Arecaceae)
Luz, Petterson Baptista da;Pimenta, Ricardo Soares;Pizetta, Patricia Unger César;Castro, Amanda de;Pivetta, Kathia Fernandes Lopes;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000500016
Abstract: dypsis decaryi (jum.) beentje & j. dransf. is an important palm with ornamental commercial value. although it reproduces sexually, there are no data available as far as what are the factors that affect this species seed germination. the purpose of this work is to study the potential effects of temperature and substrate in dypsis decaryi seed germination. the research framework is based on randomization, using a 6 x 2 factorial schema (six different temperatures, 25oc, 30oc, 35oc, 20-30oc, 25-35oc and room temperature, combined with two types of substratum, sand and vermiculite) with 5 repetitions of 20 seeds. the researcher made daily records on the number of germinated seeds, and the criteria used was protusion of the germination plug. after 35 days data become stable. the index of germination speed (ivg) and germination percentage were then calculated (data were converted to sen). the averages for these two indexes were compared using the scott-knott method with a probability of 5%. the data show that the higher percentages of germination were obtained with a sand substratum at temperatures of 25oc (86%), 25-35oc (92%) and lab room temperature (93%), and with a vermiculite substratum, at temperatures of 25oc (76%), 30oc (83%), 20-30oc (87%), 25-35oc (80%) and room temperature (91%). the seeds germinated sooner in the lab environment, for both substrates. the percentage of germination at 35oc was markedly lower, both on sand (21%) and vermiculite (38%). in this case, the seeds took longer to germinate and germination was not uniform.
Avalia??o da qualidade fisiológica de sementes de feij?o-caupi pelo teste de condutividade elétrica
Batista, Nathalia Aparecida Silva;Luz, Petterson Baptista da;Paiva Sobrinho, Severino de;Neves, Leonarda Grillo;Krause, Willian;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000400017
Abstract: the electrical conductivity of the seed soaking solution is a procedure recommended for the evaluation of vigor in pea and soybean seeds. however, it was not so well established in other species. the objective of this work was to evaluate their effects on physiological quality of cowpea seeds. four batches of cowpea seeds were tested for germination, first count of germination, germination percentage, emergence percentage, rate of emergence, radicle and variations in electrical conductivity (temperature 25 °c; volumes of 75 ml and 100 ml of water, 25 and 50 seeds, and 2, 4, 8, 12 and 24 hours periods). the experimental design was a completely randomized with four replicates for each treatment. based on these results, it was found that the electrical conductivity test was efficient in the separation of seed lots according to their vigor levels.
Otimiza??o do uso dos descritores morfo-agron?micos de mandioca em análise multivariada
Vendramini, Jhonata Maia;Neves, Leonarda Grillo;Barelli, Marco Antonio Aparecido;Elias, Júlio César Ferreira;Luz, Petterson Baptista da;
Revista Ciência Agron?mica , 2011, DOI: 10.1590/S1806-66902011000400012
Abstract: this paper aims to evaluate and characterize the cassava accessions that are being introduced into the germplasm collection of unemat present in the experimental field empaer at the city of cáceres, mato grosso, brazil. it was also analyzed the use of morpho-agronomic descriptors as its efficiency with the use of multicategory variables through multivariate analysis. in each accession were analyzed and assessed 40 morphological and agronomic traits, which are considered essential to the tests for distinctness, uniformity and stability of manihot accessions ssp. the study showed that excluding the group of least descriptors obtained results from about 92% similarity compared with the use of all words. results obtained from 38 accessions of cassava germplasm bank of unemat caceres campus, show genetic variability.
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