oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
EFECTO DEL USO DE RECUBRIMIENTOS SOBRE LA CALIDAD DEL TOMATE (Lycopersicon esculentum mill)
AMAYA,PAOLA; PE?A,LORNA; MOSQUERA,ANDRéS; VILLADA,HéCTOR; VILLADA,DORA;
DYNA , 2010,
Abstract: this study evaluated the effect of the native cassava starch solution (manihot esculenta crantz) and commercial wax application on the firmness, rate of breathing, degrees brix and tomato ph (lycopersicom esculentum mill) to room temperature, through an experimental design completely at random with 3 replications and 3 repetitions, the results were submitted to a variance analysis with a probability of 95%; the significantly different average values were compared using the test of dunnet, for a probability of 95%. there were no significant differences in the evolution of the rate of breathing, degrees brix and titleable acidity (pf of 0,26, 0,48 and 0,28 respectively) whereas if there were it, in the firmness (pf of 0,045), where the tomatoes covered with commercial wax showed a greater firmness and a lower rate of breathing that the fruits covered with the starch solution and the witness.
Genetic control of modified genomic region in a firm ripening tomato (Lycopersicon esculentum Mill.) mutant  [PDF]
Adilson Ricken Schuelter,Josiani Marochio,Cristina Soares de Souza,Claudia Cristina Olsen Philippsen
Crop Breeding and Applied Biotechnology , 2006,
Abstract: Studies involving the firm tomato (Lycopersicon esculentum) mutant have shown that pleiotropy or geneticlinkage are responsible for modifications in morphological and postharvest traits. The objective of this report was to evaluatethe hypothesis of pleiotropy or genetic linkage linked to morphologic traits and to verify the effect of QTL on fruit firmness.Plants of mutant firm and L. cheesmani were intercrossed; the F2 and F3 generations were analyzed for segregation ofmorphological traits and firmness, and the RAPD technique was used for the F2 population. Results showed that the recessivepleiotropic gene is responsible for the morphological traits, but environmental and/or genetic factors affect the penetranceand expressivity of the mutation. By the RAPD analysis, a QTL was detected in the group represented by the markers AS-08622,AQ-16747 and l-2 that explains 29.77% of the variation to fruit firmness.
1-Methylcyclopropene delays tomato fruit ripening
Moretti, Celso Luiz;Araújo, Alessandra L.;Marouelli, Waldir Aparecido;Silva, Washington Luiz C.;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000400030
Abstract: tomato (lycopersicon esculentum mill.) fruits, cv. santa clara, were harvested at the breaker stage from commercial fields in brazlandia, brazil, to investigate the ability of 1-methylcyclopropene (1-mcp) to retard tomato fruit ripening. fruit without external blemishes were graded for size (diameter = 80±5 mm) and mass (m = 130±10 g), placed inside hermetically sealed boxes, and 1-mcp was applied for 12 hours (t = 22±1°c; rh = 80-85%) at four different concentrations: 0 (control), 250, 500 and 1000 ml.l-1. fruits were held at ambient conditions (t = 23±2°c; rh 80-85%) for 2 days and then stored inside a cold room (t = 20±1°c; rh = 85-95%). every 3 days, during a 15-day period, fruits were analyzed for firmness, total soluble solids, titratable acidity, external color, and total carotenoids. firmness of fruit treated with 1000 ml.l-1 was about 88% higher than control fruits after 17 days. the a*/b* ratio, an indicator of skin color, for fruit treated with 1000 ml.l-1 of 1-mcp was 38% lower than control fruits at the end of the storage period. treatments with higher concentrations of 1-mcp delayed total carotenoids synthesis and color development. control fruits stored for 17 days had about 190% more total carotenoids than fruits treated with 1000 ml.l-1 of 1-mcp. postharvest application of 1-mcp was an efficient method to delay tomato fruit ripening. as 1-mcp concentration increased, ripening was further delayed. tomatoes treated with 250, 500, and 1000 ml.l-1 of 1-mcp were delayed by 8 to 11, 11 to 13 and 15 to 17 days, respectively.
Comportamento pós-colheita das características químicas, bioquímicas e físicas de frutos de tomateiros heterozigotos nos locos alcoba?a e ripening inhibitort
Santos Junior, Alcides Milit?o dos;Maluf, Wilson Roberto;Faria, Marcos Ventura;Lima, Luiz Carlos de Oliveira;Campos, Karina Pereira de;Lima, Herbert Cavalcante de;Araújo, Francisca Marta M. C. de;
Ciência e Agrotecnologia , 2003, DOI: 10.1590/S1413-70542003000400002
Abstract: the ripening mutants alc and rin delay tomato (lycopersicon esculentum mill.) ripening and affect synthesis of carotenoids pigments and fruit firmness. this paper reports on the comparative effects of heterozygous alc and rin genotipes (alc+/alc and rin+/rin) on chemical, biochemical and physical aspects of tomato fruit during three ripening stages. neither alc+/alc nor rin+/rin influenced total solids contents in the intermediary or fully ripe stages. the genotype rin+/rin brought about a more marked reduction in lycopene than alc+/alc, relative to the normal genotype. in mature fruit, pectinmethylesterase activity was more markedly by rin+/rin, whereas alc+/alc was more effective in reducing polygalacturose activity. in the breaker stage, neither mutant affected cellulose, hemicellulose or pectin contents. in the intermediary stage hemicellulose was reduced by rin+/rin and, in mature stage, rin+/rin reduced cell wall cellulose and pectin fractions. both alc+/alc and rin+/rin can be efficiently deployed in breeding long shelf life tomato hybrids.
Ciclo de matura??o e produ??o de etileno de tomates (Lycopersicon esculentum, Mill.) transgênicos
CHAVES, Ana Lúcia;ROMBALDI, Cesar;ARAUJO, Paulo Junqueira de;BALAGUé, Claudine;PECH, Jean-Claude;AYUB, Ricardo Antonio;
Ciência e Tecnologia de Alimentos , 1998, DOI: 10.1590/S0101-20611998000100024
Abstract: this work was carried out to study the physiological behaviour of tomato fruits (lycopersicon esculentum, mill.), var. kada, geneticaly transformed, via agrobacterium tumefaciens, with the pmel1 dna clone, in antisense orientation, and nontransformed ones, from the same variety, growth in a greenhouse. the physiological study was conducted for evaluating the ripening cycle of fruits, ripened attached and detached from the plants in the mature-green stage , and their ethylene production. on average, tranformed tomatoes that ripened atached to the plants had a ripenig cycle of 27 days, whereas in detached fruits, this time was 50 days. instead of it, nontransformed tomatoes showed a faster ripening process when ripened detached to the plants (20 days), whereas in attached fruits this period was 30 days, on average. these results were related to ethylene production. tomato fruits from nontransformed plants produced 13,46 nl ethylene.g-1.h-1, and the transformed fruits showed an ethylene production almost 100 times smaller than nontransformed ones ( 0,13 nl ethylene.g-1.h-1). thus, the conclusion reached is that the reduction of ethylene production observed in transgenic tomatoes is necessary but it is not enough to extend the ripening cycle and to increase the period of time that the fruits will last. to achieve this, it is necessary to harvest the fruits in the mature-green stage.
Resposta de fêmeas de Encarsia formosa Gahan (Hymenoptera: Aphelinidae) aos odores do hospedeiro e da planta-hospedeira em olfat?metro de quatro vias
Siqueira, Kátia Maria Medeiros de;Farias, Angela Maria Isidro de;
Bragantia , 2003, DOI: 10.1590/S0006-87052003000300011
Abstract: the increasing importance of the whitefly bemisia tabaci race b (hemiptera: aleyrodidae) as one of the major agricultural pest of this century, has resulted in a search for natural enemies that can be used in biological control programs. the response of naive females of encarsia formosa (hymenoptera: aphelinidae)to volatiles from its hostspecies: insect (b. tabacci race b) and plant (lycopersicom esculentum mill.) were tested using 4-nose olfactometre. parasitoid was not attracted by neither or insect hostspecies volatile.
Efecto del momento del riego y el nitrato de calcio en plantas de tomate (Lycopersicom esculentum L.) Irrigation moment and calcium nitrate effect on tomato (Lycopersicom esculentum L.) plants
C Ruiz,T Russián,D Tua
Revista de la Facultad de Agronomía , 2008,
Abstract: Se estudió el efecto del momento de riego y la aplicación de calcio sobre el crecimiento y la primera cosecha de plantas de tomate cv. Río Grande. Se utilizó riego por surcos y como fuente de Ca el nitrato de calcio (240 kg.ha-1). Los tratamientos fueron riego en la ma ana + Ca (RmCa); riego en la tarde + Ca (RtCa); riego en la ma ana sin Ca (RmSCa) y riego en la tarde sin Ca (RtSCa). Se usó un dise o de parcelas divididas con dos factores dos niveles y tres repeticiones. A los 40 y 60 días después de aplicado el tratamiento (ddat), se evaluaron las variables altura de la planta (ap), número de ramas primarias (rp), número de racimos florales (nrf), de flores (nf), de frutos con pudrición terminal (fpt) y sanos (fs), peso fresco (pf) y peso seco (ps) de la hoja. El N con excepción del tratamiento RmCa, a los 40 ddat se encontró en niveles suficientes y estuvo deficiente a los 60 ddat; el P y el Mg se encontraron suficientes, el K bajo, el Ca alto y los microelementos suficientes. La mayor ap, a los 40 ddat, correspondió al Rt y al Ca, de igual manera a los 60 ddat pero SCa. En las variables rp, nrf, nf, no se encontraron diferencias estadísticas. El mayor número de fs correspondió a los tratamientos RmCa y RtSCa y el mayor promedio de fpt, al RmSCa y RtSCa. No se encontraron diferencias para las variables pf y ps. The effect of irrigation moment and calcium applying on growing and the first harvest of tomato cv. Rio Grande plants was studied. Irrigation by furrows was used and nitrate of calcium (240 kg.ha-1) was used as a calcium source. Treatments were morning irrigation + Ca (MICa); afternoon irrigation + Ca (AICa); irrigation in the morning without Ca (MIWCa) and afternoon irrigation without Ca (AIWCa). A plot design divided with two factors, two levels and three replicates was used. The variables were evaluated to the 40 and 60 days after the treatment applied (DATA). Plant eight (PH), primary branches number (PBN), of floral clusters (FCN), of flowers (FN), of blossom-end rot fruits (BERF) and healthy (HF), fresh weight (FW) and dry weight (DW) of leaf were evaluated. N except for the treatment MICa, to the 40 DATA were found in enough levels and it was deficient to the 60 DATA; P and Mg were enough, K was low, Ca was found high and the microelements were found in enough levels. The larger PH, to the 40 DATA, corresponded to the IA and the Ca, in the same way to the 60 DATA to WCa. In the variable PBN, FCN and FN, statistical differences were not found. The larger number of FN corresponded to the treatments IMCa and IAWCa and the higher average of
Effect of harvesting and storage conditions on the post harvest quality of tomato (Lycopersicon esculentum Mill) cv. Roma VF  [PDF]
K.M. Moneruzzaman,A.B.M S. Hossain,W. Sani,M. Saifuddin
Australian Journal of Crop Science , 2009,
Abstract: The study was conducted to undertake the effect of harvesting stage and storage conditions on the post harvest quality of tomato cv. Roma VF (Lycopersicon esculentum Mill) during the process of ripening in storage. Fruit of three maturity stages such as mature green (mature but green in color), half ripen (breaker stage when fruit turns to yellow) and full ripen (yellow and soft, edible stage) were kept under three different conditions; open condition (control), covering with white polythene and finally treatment by CaC2+ polythene. High and significant variation was observed in quality characteristics under different harvesting stages, storage conditions and their combinations. The highest value for rotting and total sugar content was distinguished in full ripens tomato. The highest weight loss and shelf life was measured in mature green. The half ripen tomato showed the highest value of vitamin C and titrable acidity. The percentage of decay (rotting) and weight loss, pH, titrable acidity and total sugar were increased with gradual increasing of storage time, irrespective to maturity stages while the percentage of vitamin C was decreased with progressing time of storage. The highest value of weight loss, shelf life and titrable acidity was recorded in control treatment. The high decay (rotting percent) and total sugar content was recorded under CaC2+ polythene covering treatment while the highest vitamin C content and pH was measured in simple polythene covering treatment at the final observation day (15th day). The values of all parameters except for vitamin C were increased gradually with the exceeding of storage time irrespective to storage condition. Tomato plants placed under CaC2+ treatment, covered with polythene have shown the highest decay, titrable acidity and total sugar content at the final observation day.
CYTOGENETIC EFFECTS INDUCED BY PHENOLIC COMPOUNDS IN LYCOPERSICON ESCULENTUM MILL  [cached]
Anca Balas,Gabriela Capraru,Mihaela Danila,Valentin Popa
Analele ?tiin?ifice Ale Universit??ii Alexandru Ioan Cuza din Ia?i,Sectiunea II A : Genetica si Biologie Moleculara , 2007,
Abstract: The aim of this paper is to evaluate the effects of the phenolic compounds extracted from spruce bark on cells from the radicular apex of Lycopersicon esculentum Mill. We found that different concentrations of polyphenols and the time of treatment modified the frequency of cells division and the number of mitotic ana-telophases with aberrations.
COLETOR DE PóLEN PARA FLOR DE TOMATEIRO (Lycopersicon esculentum) TOMATO FLOWER (Lycopersicon esculentum) POLLEN COLLECTOR  [cached]
Reinaldo Soares de Paula,Rogério de Araújo Almeida
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v29i2.2871
Abstract: Partindo de um barbeador elétrico, um coletor de pólen foi desenvolvido no Laboratório de Mecaniza o da Escola de Agronomia da Universidade Federal de Goiás, a fim de extrair o pólen da flor do tomateiro (Lycopersicon esculentum Mill.), de maneira fácil e dinamica. O coletor de pólen mostrou-se prático e eficiente. PALAVRAS-CHAVE: Coletor; extra o; pólen; tomate. Starting from an electric shaver, a pollen collector was developed at the Mecanization Laboratory of the Agronomy School of the Federal University of Goiás, in order to make the extraction of the tomato (Lycopersicon esculentum Mill.) flower pollen easy and dynamic The pollen collector proved to be practical and efficient. KEY-WORDS: Collector; extraction; pollen; tomato.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.