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Quantitative determination of macronutrients (NPK) in leafy vegetables in marketed in free trade fairs

ADVANCES IN HORTICULTURE - REVIEW | Dos Santos Viana, J.; Nascimento Gomes, A. M.; Nahuz Lourenço, M. S.; Chagas Filho, E.

Tags: vegetables, food preference, nutritional quality

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The search for good quality hardwood vegetables has grown, and consumers are becoming increasingly demanding as to the appearance, color and size of these products. Chemical quality is one of the main programs used in food control. The objective of this paper was to determine the macronutrient contents in leafy vegetables marketed in open fairs in the city of São Luís. The experiment was carried out in the laboratory of mineral nutrition of plants of the engineering nucleus of the State University of Maranhão. From a universe of 14 hardwood vegetables, six of the highest consumption in five free fairs through the application of questionnaires, were selected. Sulfuric digestion/ hydrogen peroxide and P and K determined the N contents by nitroperchloric digestion. The six leafy vegetables selected were: Lactuca sativa, Allium schoenoprasum, Coriandrum sativum, Brassica oleracea var. capitata, Talinum triangulare and Hibiscus sabdariffa. It was verified that the regional vegetables are the most consumed by the population, with emphasis on the non conventional vegetables Hibiscus sabdariffa and Talinum triangulare. The results obtained in the chemical analyses showed potassium and phosphorus deficiency for the samples of Lactuca sativa and Brassica oleraceacapitata in the five fairs studied, indicating inadequate mineral fertilization (excess or deficiency) of these vegetables. While for other unconventional vegetables, more studies are necessary because literature is deficient in information about them.

Biological studies of Microtheca ochroloma Ståhl (Coleoptera, Chrysomelidae) associated to white mustard crop (Sinapis alba L.) in laboratory and field conditions

AROMATICS | Riquelme Virgala, M.B.; Santadino, M.V. y Di Silvestro, G.

Tags: Alimentary preference, Brassicaceae, yellow margin beetle, life cycle

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In recent years the cultivation of white mustard (Sinapis alba) has been promoted as a winter alternative crop in the Pampas. Previous studies related to mustard entomofauna, denote the presence of Microtheca ochroloma, a specific chrysomelid of Brassicaceae family, causing significant defoliation. The objectives of this study were to evaluate whether the presence of M. ochroloma varies according to different genetic materials and white mustard phenological stages and describe some parameters of its life cycle feeding on this crop. The studies were carried out in the Experimental field and Laboratory of Agricultural Zoology of Universidad Nacional de Luján. Genetic materials of different origins of white mustard, were sampled weekly in the number of plants infested with larvae and adults of M. ochroloma during a growing season. The development cycle was studied under laboratory conditions (24 ± 2 ºC, 60 ± 10 % RH, photoperiod 10L: 14O) from a cohort of eggs. The larvae were fed with the origin Canada and recorded development time of each stage. Pupae were sexed and then formed pairs to estimate the pre-oviposition period and fecundity for 30 days. Both larvae and adults were recorded in all genetic material, although the number of infected plants showed no significant differences between origins and between phenological stages. The average cycle length was 29.1 days. Females oviposit a mean of 74.9 eggs into several groups. These results suggest that M. ochroloma interchangeably used as a food source to all genetic material evaluated and successfully completes its life cycle feeding on S. alba.

Analysis of characters related with color of increased root in a crossbreeding of two clones of Ipomoea batatas L. (Lam.)

HORTICULTURE | Arizio, C.M.; Manifesto, M.M. y Martí, H.R.

Tags: Transgressive heredity, Anthocyanins, Carotenes, Maternal heredity, Hue, Croma, Luminosity

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Color is a major factor in consumer's (consumer's preference) buying choices, and pigments responsible for color have functional properties. The aim of this work were to determine the existence of a maternal effect,replica piaget and whether there is association between skin and flesh color of the sweet potato (Ipomoea batatas L. Lam) tuberous root. There were genotypes with higher and lower values of color than their progenitors. The direction of the crosses did not affect color variables, what suggests that there was not a maternal effect. Skin with anthocyanic pigments was incompletely dominant over white/cream skin, meanwhile white/cream flesh was incompletely dominant over orange flesh. Flesh and skin color were associated,cartier replica being "skin with anthocyanins with white/cream flesh" the most frequent combination and "white/cream with orange skin or flesh" the less frequent. This work is part of the development of a linkage map which will allow the relative localization of reported genes involved in pigment synthesis in tuberous roots of sweetpotatoes.