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Search Results: 1 - 10 of 343 matches for " Manihot esculenta "
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Caracteriza??o de isolados de Phytophthora drechsleri, agente causal da podrid?o mole de raízes de mandioca
Muniz, Maria de Fátima S.;Andrade, Flávia Waleska R. de;Queiroz, Fátima M.;Moura Filho, Gilson;Menezes, Maria;
Fitopatologia Brasileira , 2006, DOI: 10.1590/S0100-41582006000200013
Abstract: nine phytophthora isolates from cassava (manihot esculenta) were characterized based on morphology and morphometry of propagative structures, growth at 10, 15, 20, 25, 30 and 35 oc, and by evaluating its pathogenicity. sporangia produced on nonsterile soil extract were ovoid, nonpapillate and persistent, formed in a sympodium or unbranched sporangiophores, 24.6 to 57.4 μm long x 14.8 to 37.7 μm wide, and length-breadth ratio was 1.0 - 2.6. chlamydospores were rarely observed. oospores produced in single spore culture on v8 agar medium were aplerotic, and 13.1 to 34.4 μm in diameter. antheridia were amphigynous, measuring 8.2 - 24.6 μ x 8.2 - 19.7 μ ; oogonia ranged from 19.7 to 41.0 μm in diameter. culture growth was greatest at 25 oc in v8 agar medium. the isolates that were pathogenic to plants and detached roots of cassava were identified as phytophthora drechsleri tucker.
Cultivo de anteras en dos clones de yuca
Chirinos,Marilú; Velásquez S,Rosalía; Noguera,Arnaldo; Pérez,Miguel; Mata,Jonás; Polanco,Delia;
Agronomía Tropical , 2006,
Abstract: cassava anther culture is a strategical tool for breeding programs in order to obtain haploid plants, allowing selection of improved clones and detection of very important genes through molecular markers. a complete protocol for cassava haploid plant production has not been developed, therefore we evaluated morphogenic response in two cassava clones: sweet (ucv-2726) and bitter (ucv-2375), for two different sizes (1-1.5 mm and 2-2,5 mm) of floral buds selected in order to ascertain the optimal developmental phase of the microspore. murashige and skoog and chu et al. media were evaluated, supplied with two different auxin concentrations. a factorial 32 completely randomized design and duncan test were used as statistical methods. for floral bud size of 1-1.5 mm, tetrad and uninucleated microspores were observed. during callus induction, differences were found for bud size with the highest number of calluses formed for 1-1.5 mm in ms medium. the anavar did not show significant differences between clone types and culture media. there were two different mean groups for callus number. callus tissue differentiated morphogenically into roots; this might be associated with auxins applied to the medium.
água salina nos atributos químicos do solo e no estado nutricional da mandioqueira
Holanda Filho, Roberto S. F. de;Santos, Delfran B. dos;Azevedo, Carlos A. V. de;Coelho, Eugênio F.;Lima, Vera L. A. de;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2011, DOI: 10.1590/S1415-43662011000100009
Abstract: the purpose of this study was to assess the influence of saline water on chemical properties of the soil and nutritional attributes of cassava. the work was conducted in the area of irrigation and drainage of if baiano, campus de senhor do bonfim, ba (10° 28’s, 40° 11’w and 550 m). the experimental design was completely randomized, consisting of seven treatments and three replicates. the treatments consisted of control (rainfed), a treatment irrigated with drinking water (100% of etc) and five treatments irrigated with saline water of 3 ds m-1 with varying water depths: 110, 120, 130, 140 and 150% of etc. the use of saline water increased the exchangeable sodium percentage, the sodium adsortion ratio and the electrical conductivity of the soil in both 0-0.20 and 0.20-0.40 m dephts. regarding the leaf nutritional status of cassava, the treatments influenced only the contents of calcium, magnesium and chlorine.
Scientia Agricola , 1998, DOI: 10.1590/S0103-90161998000200016
Abstract: an experiment was carried out in order to evaluate the vegetative and productive behavior of three cultivars of cassava (manihot esculenta crantz) related to the above ground architecture, in four planting spacings. the research was carried out in piracicaba, state of s?o paulo, brazil from october 1993 to july 1994, on a rhodic kandindox soil. the treatments constituted of cultivars srt 59 (branca de santa catarina), iac 576-70 and iac 1287 (fibra), described as low and open-angle branching, high and close-angle branching and no or late branching, respectively. each treatment had three subtreatments of planting spacings: 1.0 m x 1.0 m; 1.0 m x 0.8 m, 1.0 m x 0.6 m and 1.0 m x 0.4 m, arranged in randomized blocks with subdivided plots and four replications. each subplot was constituted of 4 lines with 10 plants each. evaluations were performed on the 16 central plants of each subplot. the branching cultivars and the smallest planting spacings favored canopy closure. smaller the planting spacings closer the branching angle and smaller the diameter of the primary stems for the branching cultivars the smaller the planting spaces the higher the root yield for the no branching cultivars.
Cassava Flour: Quantification of Cyanide Content  [PDF]
André Rinaldi Fukushima, Maria Aparecida Nicoletti, Almir Junior Rodrigues, Caroline Pressutti, Jeandro Almeida, Tamires Brand?o, Rosilene Kinue Ito, Luis Ant?nio Bafille Leoni, Helenice De Souza Spinosa
Food and Nutrition Sciences (FNS) , 2016, DOI: 10.4236/fns.2016.77060
Abstract: Cassava flours are obtained from the roots of Manihot esculenta Crantz and daily fairly consumed by the Brazilian population considering it comes to hum food, and also inserted into food baskets, besides to present low cost and easy access, in addition to being plant easily cultivated by the population. However, the food obtained with cassava may contain hydrocyanic acid, in the form of cyanogenic glycoside when those meals are not cooked properly. The oral toxicity can range 30 - 210 mg/kg body, the average daily consumption per capita in larger rural areas than in urban areas for cassava flour 19.1 g against 4.7 g, respectively. Brazil’s North and Northeast have higher consumption of cassava flour, associated with family monthly monetary income, making this region more vulnerable to poisoning. The objective of this study was to quantify cyanogenic glycosides present in some types of Brazilian cassava foods by means of spectrophotometric technique (reading at a wavelength of 530 nm). For quantitative determination of cyanide content, linamarase hydrolysis was used. The amount of cyanide was determined, and results were: artisan toasted cassava flour: 15 mg/500g, sweet cassava starch: 32.5 mg/500g, artisan dried cassava flour: 37.5 mg/500g, “bijuzada” cassava flour: 60 mg/500g, industrialized, toasted cassava flour: 115 mg/500g, industrialized, raw cassava flour: 140 mg/500g, and wet cassava flour: 225 mg/500g. Considering the chronic ingestion of cyanide present in these foods, they can cause public health problems.
Avalia o de dois clones de mandioca em duas épocas de colheita. = Evaluation of two cassava clones during two distinct harvest seasons.
José Maria Arcanjo Alves,Fernanda Aguiar da Costa,Sandra Cátia Pereira Uch?a,Célida Socorro Vieira dos Santos
Agro@mbiente On-line , 2008,
Abstract: A mandioca é uma cultura de fácil adapta o às diferentes condi es edafoclimáticas e desempenha uma elevada importancia social por se constituir na principal fonte de carboidratos nos países em desenvolvimento. Um dos maiores obstáculos para a utiliza o da mandioca é a alta perecibilidade de sua raiz, quando armazenada em condi es ambientais, pois possuem uma vida útil muito restrita. Neste trabalho procurou-se avaliar as características das raízes tuberosas de dois clones de mandioca para mesa cultivadas nas condi es edafoclimáticas do cerrado de Roraima, colhidas aos 7 e 13 meses, visando o processamento mínimo. Os experimentos foram conduzidos no Campus Cauamé do Centro de Ciências Agrárias daUniversidade Federal de Roraima em Boa Vista, Roraima. Os dados das variáveis quantitativas foram submetidas à análise de variancia (p<0,05). As médias foram comparadas pelo teste de Tukey a 5% de probabilidade. Conclui-se que os clones de mandioca para mesa P o e Aciolina podem ser colhidos aos sete meses após o plantio, tanto para o consumo in natura quanto para a indústria, nas condi es edafoclimáticas do cerrado de Roraima. As raízes da Aciolina, colhidas aos 13 meses de idade, apresentam melhor qualidade visual quando armazenadas em ambiente refrigerado (5 ± 2,0 oC) durante 14 dias em rela o às raízes do clone P o e o tempo de coc o das raízes refrigeradas por 30 dias do clone Aciolina é superior a 30 minutos, sendo imprestável para o consumo humano. = The cassava is an easy adaptation culture to the different weather and soil conditions and plays an important social role as being the prime carbohydrates source in the countries under development. One of the biggest obstacles in the use of the cassava is its highly perishable roots, when stored in the environmental climate conditions, since it has a very restricted useful life. In this study, it was sought to evaluate the features of two cassava varieties roots cultivated in the weather and soil conditions of the savannah (cerrado) area, harvested at 7 and 13 months, looking forward the reduced processing. The experiments were conducted in the Campus Cauamé of the Centro de Ciências Agrárias of the Universidade Federal de Roraima (CCA/UFRR) in Boa Vista, Roraima. The data of quantitative variables were submitted to analysis of variance (p<0.05). Means were compared by Tukey test at 5% probability. Concluding: the P o and Aciolina clone can be harvested 7 months after the planting, for the in natura consumption as well as for the industry, in the weather and soil conditions of the savannah (cerrado) ar
Cassava shoot infestation by larvae of Neosilba perezi (Romero & Ruppell) (Diptera: Lonchaeidae) in S?o Paulo State, Brazil
Gisloti, L;Prado, A P do;
Neotropical Entomology , 2011, DOI: 10.1590/S1519-566X2011000300004
Abstract: among the pests of cassava, the shoot fly, neosilba perezi (romero & ruppell), is one of the most prevalent. it attacks mainly the terminal shoots and causes infested plants to produce lateral shoots. reports on this species are rare or inexistent; thus, the purpose of this study was to assess three different areas for n. perezi infestation. the survey began in march 2008 and finished in february 2009. fortnightly analyses were performed starting 45 days after planting, calculating the rate of infestation by n. perezi larvae in each study area. the areas were correlated separately for each parameter: fortnightly mean temperature, fortnightly mean rainfall, and plant age. the n. perezi larvae occurrence rate was higher in area 1 - which presented the highest population peaks in autumn and winter. there was only a single population peak in area 2, in winter; and area 3 presented the weakest population peak among the three, in november. the shoot fly population dynamics in the studied region is separately correlated to temperature, rainfall and plant age: temperatures above 23oc, relatively high rainfall and older plants seem to have a negative effect on populations of this insect.
Uso da manipueira como fonte de potássio na cultura da alface (Lactuca sativa L.) cultivada em casa-de-vegeta??o
Santos, Max Henrique Vieira dos;Araújo, Afranio César de;Santos, Deon Moreno Ribeiro dos;Lima, Nadielan da Silva;Lima, Cícero Luiz Calazans de;Santiago, Ant?nio Dias;
Acta Scientiarum. Agronomy , 2010, DOI: 10.4025/actasciagron.v32i4.4819
Abstract: this work was conducted in 2006 at embrapa/uep/rio largo, located at the delza gitaí campus - agrarian science center academic unity - ufal, aiming to evaluate the use of cassava industry wastewater as a potassium source on lettuce crop in different doses. the research was conducted in a plastic greenhouse, in randomized complete blocks with six treatments and six repetitions, being the treatments: 0, 100, 200, 300, 400 and 500 ml of cassava industry wastewater per 5 l vase. the lettuce cultivar regina sf 3500 was used, and the harvest was performed 33 days after transplantation. leaf area, fresh leaf mass, dry leaf mass, number of leaves, fresh stem mass and fresh root mass were evaluated. cassava industry wastewater can be used as a source of potassium for lettuce depending on the applied dose.
Efecto de la variabilidad en genotipos de Yuca sobre factores vinculados a la brotación y crecimiento de Esquejes
Bioagro , 2006,
Abstract: in order to study the influence of cassava genotypes variability on sprouting and growth of stems cuttings, an experiment was conducted with eight clones identified as mven-07, mven-889, mbol-12, sg-107- 35, bonifacia-n, bonifacia-r, canaria-d and ucv-2105. previously, the clones were cultivated under similar managment system and harvested at 11 months old, selecting stems with diameters from 2.5 to 3.5 cm, for controlling no genetic sources of variation. a randomized completely block design with four replications was applied, and water content, sprouting, and aerial and root dry matter on the stems cuttings were evaluated. characteristics more frequently found were plant size from 1,51 to 2,50 m, stems with right growth, erect habit, ramifications with four and more levels, roots with corrugated texture, cylinder- conic shape, cream- yellow felodermis, and white flesh, oblanceolate leafs, with seven lobules, yellow-green petioles, yellow- green stems and toxic roots. significant differences were found between clones (p≤0.01) except for sprouting, factor that was not affected by genotype variations. the differences related to aerial and radical growth of stems cuttings was attributed to genetic reasons in characteristics, such us plant size, ramification levels, shape of leaf lobules, ramification height and decumbence. the best balance related to the studied variables was found on genotypes mven-07, bonifacia-r and sg-107-35.
épocas de poda na cultura da mandioca na regi?o noroeste do Paraná, Brasil
Takahashi, Mário;
Brazilian Archives of Biology and Technology , 1998, DOI: 10.1590/S1516-89131998000400015
Abstract: this work was undertaken with the objetive of evaluating the effect of pruning the aerial part in three distinct times upon the culture of cassava. all treatments were planted in october, 1991. in 1992, the canops pruned in three different times: may, june and july. a control treatment was cultivated without pruning. in may, 1993, all treatment were harvested. in comparision with the control, the three times of pruning resulted in alterations that modified the productions of fresh and dry root and canops matter as well was the harvest index. the final stand and the number of roots per plant were not altered by pruning. the differences in the production of canops on the pruning were altered due to the great variability in quantity of leaves
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