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Search Results: 1 - 10 of 1020 matches for " Eveline Mantovani; "
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Biologia reprodutiva de Cryptostegia madagascariensis Bojer ex Decne. (Periplocoideae, Apocynaceae), espécie ornamental e exótica no Brasil
Vieira, Milene Faria;Leite, Mauro Sérgio de Oliveira;Grossi, José Antonio Saraiva;Alvarenga, Eveline Mantovani;
Bragantia , 2004, DOI: 10.1590/S0006-87052004000300002
Abstract: reproductive phenology, floral biology, breeding system and pollinators were analyzed on cryptostegia madagascariensis individuals cultivated at federal university of vi?osa campus, municipality of vi?osa, zona da mata of minas gerais state. in addition, seed viability and vigour from naturally opened fruits were tested. seed germination from yellow-green pericarp closed fruits was also tested. flowering of c. madagascariensis occurs mainly in november and december. fruits (follicles) are exhibited during all year, but more frequently in january and february. flowers open during the day and last about 24 hours. they exhibit protandry, secondary pollen presentation and intragynoecial compitum, which results in the production of twin follicles (two follicles per flower). it is self-compatible, but spontaneous self-pollination does not occur due to morphological characteristics. bees should be the main pollinators, as they exhibited the pollinarium attached to their mouthparts. at least one pollinarium was removed per flower. however, the low natural fructification (2.7%) rate indicates that these insects are efficient for pollinaria removal, but less efficient for deposition of collected pollen. the follicles take four months to reach the maximum size (average of 6.44 cm length, 2.45 cm height and 3.4 cm width), and 210 days for opening. each follicle averaged 96.5 seeds. the ideal conditions for seed quality evaluation, from naturally opened follicles, were 30 oc constant temperature and no supplementary light, and counting occurred at the 7th days. seeds from closed follicles showed 93% germination under those conditions.
Efeito da escarifica??o ácida e de diferentes temperaturas na qualidade fisiológica de sementes de Strelitzia reginae
Barbosa, José Geraldo;Alvarenga, Eveline Mantovani;Dias, Denise Cunha Fernandes dos Santos;Vieira, Alessandro Nunes;
Revista Brasileira de Sementes , 2005, DOI: 10.1590/S0101-31222005000100009
Abstract: this experiment was conducted with the objective of evaluating the effect of acid scarification and different temperatures on the physiological quality of strelitzia reginae seeds. the seeds were scarified with concentrated sulfuric acid for 0, 3, 5, 7, and 9 minutes. in the laboratory, the seeds were placed in paper towel rolls and taken to the germinator set at 25oc, 20o-30oc, and 30oc. in the germination test at 30 days, normal seedlings (germination), abnormal seedlings, dead seeds, and hard seeds were evaluated. to determine vigor, first germination counting, root length, and germination speed were evaluated. in the greenhouse at room temperature, seeds were sown on a sand bed sterilized with methilbromide, at the depth of 2 cm. emergence percentage and mean number of days to seedling emergence were assessed. higher percentage of germination and better expression of seed vigor was obtained at 25 0c. scarification with concentrated sulfuric acid favored seedling emergence in the greenhouse. in the laboratory, the best results for germination and vigor were obtained for the seeds scarified in sulfuric acid for nine minutes. however, the number of hard seeds obtained at the end of the test justifies the search for other treatments for overcoming the dormancy.
Test of exudates color hues for evaluating the physiological potential of coffee (Coffea arabica L.) seeds
Hilst, Paulo Cesar;Dias, Denise Cunha Fernandes dos Santos;Alvarenga, Eveline Mantovani;Souza, Bruna Luiza de;
Revista Brasileira de Sementes , 2012, DOI: 10.1590/S0101-31222012000200004
Abstract: coffee seeds have slow and irregular germination, losing fast their viability during storage, and the standard germination test of these seeds requires at least 30 days. besides, the results may not reflect the actual physiological quality of these seeds. the objective of this work was to develop a fast and practical test for evaluating the viability of coffee seeds, which is based on the interpretation of different color hues of exudates from seeds. coffee seeds of the cultivar catuai 44 from six lots were submitted to germination, accelerated aging, and electrical conductivity tests. in the exudates color hue test, coffee seeds without the parchment and the silvery pellicle (four replications of 10 seeds each) were distributed on top of paper towels moistened and then maintained into a germinator, at 25 oc for 24, 48, 72, 96, and 120 h. three classes of color hues were established: colorless, light color hue, and dark color hue, assigning the values of 0, 1, and 3, for each class, respectively. the proposed exudates color hue test can be recommended for the fast assessment of viability for coffee seeds. the most promising results were obtained for seeds with 12% moisture content, after imbibition periods of 72, 96, and 120 h; and with 30% moisture content, after imbibition periods of 72 and 120 h.
Quebra de dormência de sementes da videira cv. niágara rosada sem estratifica??o
Val, Aurinete Daienn Borges do;Motoike, Sérgio Yoshimitsu;Alvarenga, Eveline Mantovani;Cecon, Paulo Roberto;
Revista Ceres , 2010, DOI: 10.1590/S0034-737X2010000200015
Abstract: the objective of this study was to asses the effect of three factors on the germination of grape seeds, cv. niagara rosada. the three studied factors were: physical treatments, chemical treatments and germination environment. the physical treatments consisted of whole seeds, seeds with a cross cut in the median region and seeds with a cut in the micropyle. the chemical treatments were applied by immersing whole seeds in aqueous solution of gibberellic acid (ga3) with concentrations of 0 and 4000 mg l-1. the environments evaluated were in vitro and ex vitro. the experiment was arranged in a factorial 3 x 2x 2, randomized blocks design, with 4 repetitions, each one consisting of a gerbox? containing 25 seeds or a rack with 25 test tubes. the parameters evaluated were the percentage and speed of seed germination. the results showed that cutting is essential to the germination of non-stratified seeds. the combination micropyle cut, 4000 mg l-1 of ga3 and in vitro environment resulted in 77% of seed germination. the in vitro environment was significantly superior to the ex vitro environment.
Germina??o e qualidade de sementes de Adenostemma brasilianum (pers.) cass., Asteraceae nativa de sub-bosque de Floresta Atlantica
Godinho, Mariana Aparecida Silva;Mantovani-Alvarenga, Eveline;Vieira, Milene Faria;
Revista árvore , 2011, DOI: 10.1590/S0100-67622011000700006
Abstract: the objectives of this study were to analyze germinative behavior of adenostemma brasilianum from natural population, to evaluate their physical quality and imbibition time. seeds were collected from individuals in a semideciduous seasonal forest fragment in vi?osa, zona da mata of minas gerais state, in southeastern brazil. for physical quality evaluation, newly collected seeds (month 0) were classified as perfect (dark seeds with embryo) or imperfect (dark or pale seeds without embryo). samples of 50 newly collected seeds were germinated at three temperatures (20, 25 and 30°c) and at three luminosity conditions: light supplementation (sup), environment light (amb) and continuous darkness (esc). the germination of seed stored for two, four and six months was tested by utilizing the same methodology. seeds stored for 12 and 18 months were germinated at 25oc sup. seed dormancy and imbibition were tested with tetrazolium solution and methylene blue stain, respectively. about 74.7% of the seeds were physically perfect and partenocarpy was observed (10%).seeds started to germinate on the eighth day after sowing. the factors light, temperature and storage acted synergistically on seed germination. the highest mean germination percentages were observed in newly collected seeds and submitted to temperatures of 25 and 30oc sup (respectively 85.5 and 88.5%). seed dormancy was found in low temperature (20oc), in presence or absence of light. storage increased mortality and seed dormancy breakage; germination was null at 12 months. water absorption by seeds occurred 24 hours after immersion in methylene blue solution.
COMPARA??O DE METODOLOGIAS DO TESTE DE TETRAZóLIO PARA SEMENTES DE CAFEEIRO
Batista Zonta,Jo?o; Torres de Souza,Leandro; Fernandes dos Santos Dias,Denise Cunha; Mantovani Alvarenga,Eveline;
Idesia (Arica) , 2009, DOI: 10.4067/S0718-34292009000200002
Abstract: the tetrazolium test is a promising alternative for rapid evaluation of the seed viability. two described methodologies are available for coffee shrub. thus, this study was conducted to verify what methodology is more efficient for fast determination of both viability and energy. so, seeds from four lots were subjected to procedures as follows. 1) soaking for 24 hours at 30 oc; cutting the portion of the endosperm containing the embryo; exposure of this portion to 0.1% tetrazolium solution for 16 hours at 35 oc; then, the embryo is removed with the aid of a bistoury for subsequent evaluation. 2) soaking for 24 hours at 30 oc; removal of the embryo and its exposure to 0.1% tetrazolium solution for 16 hours at 35 oc for subsequent evaluation. to comparing the results, the germination test accomplished and the final percent germination and the vigor (1st germination counting) were evaluated. the methodology 2 showed to be more promising for the evaluation of both viability and vigor of coffee shrub seeds, since the obtained values were equal to those of the germination test. the methodology 1 was not efficient, as showing problems concerning to coloration of the embryos, therefore generating doubts during the evaluation of the seed viability.
Osmocondicionamento em sementes de pimenta 'amarela comprida' (Capsicum annuum L.) Submetidas à deteriora??o controlada
Fialho, Gustavo Sessa;Silva, Camila Andrade;Dias, Denise Cunha Fernandes dos Santos;Alvarenga, Eveline Mantovani;Barros, Willian Silva;
Ciência e Agrotecnologia , 2010, DOI: 10.1590/S1413-70542010000300017
Abstract: the osmotic conditioning technique has been considered promising for improving the physiological potential of seeds of various species. in this context, the study aimed to evaluate the effect of osmotic conditioning on the performance of pepper seeds subjected to controlled deterioration. thus, seeds of 'long yellow pepper' (capsicum annuum l.), with water content adjusted to 24%, were subjected to controlled deterioration in water bath at 45 °c for 0, 24, 48 and 72 hours. after that, they were osmotic conditioning in peg 6000 to -1.1 mpa during 0, 6 and 8 days. the germination, first count of germination, germination at low temperature, speed of germination at 15 o c and 25 °c, dry weight of seedlings and length of primary root were evaluated. it was found that the osmotic conditioning was beneficial to the germination of pepper seeds deteriorated by 48 and 72 hours, not affecting the germination of seeds of high physiological quality. it also helped to improve the strength of both the seeds that had not been damaged and those deteriorated by 48 and 72 hours, being a promising technique to increase their physiological quality.
Testes para avalia??o do vigor de sementes de sorgo com ênfase à condutividade elétrica
Soares, Marcos Morais;Concei??o, Patrícia Marluci da;Dias, Denise Cunha Fernandes dos Santos;Alvarenga, Eveline Mantovani;
Ciência e Agrotecnologia , 2010, DOI: 10.1590/S1413-70542010000200017
Abstract: the researches show that germination tests do not always reveal differences between seed lots, so that other methods have been studied that allow to differentiate the lots using vigor tests. the goal of this research was, therefore, to verify the efficiency of different vigor tests on the evaluation the physiological quality of sorghum seeds and to determine the effects of water volume and imbibition period on the efficiency of the electrical conductivity test to evaluate sorghum seed vigor. the physiological quality of the seeds was evaluated by the germination test, first count, cold test without soil, immersion in ammonium chloride, seedling emergence in greenhouse and accelerated aging. electrical conductivity was determined at 2, 4, 6, 8, 16, 24 and 48 hours imbibition, using four subsamples of 50 seeds, soaked in 50 and 75 ml water, at 25oc. the results showed that the germination test detected two levels of vigor, while the seedling emergence in greenhouse detected three levels of vigor, showing that the germination test has some limitations regarding the differentiation of lots. among vigor tests carried out in the laboratory, the test of accelerated aging and cold test without soil showed a highly significant correlation with seedling emergence in greenhouse. in the test of electric conductivity only the lot of inferior quality was discriminated with 2, 4 and 6 hours of imbibition in 75 ml of water, and with 16 hours of imbibition in 50 ml of water. it was concluded that the accelerated aging and cold test were efficient for vigor evaluation of sorghum seeds compared to the seedling emergence in greenhouse. the test of electric conductivity is not an efficient option for classification of the lots in levels of vigor of sorghum seeds, just identifying lots with low vigor.
Germina??o e morfologia do desenvolvimento pós-seminal de sementes de Nim-indiano (Azadirachta indica A. Juss. - Meliaceae)
Vidigal, Deborah de Souza;Brasileiro, Beatriz Gon?alves;Dias, Denise Cunha F. S.;Alvarenga, Eveline Mantovani;Bhering, Maria Carmen;
Revista Brasileira de Sementes , 2007, DOI: 10.1590/S0101-31222007000300005
Abstract: azadirachta indica a. juss. is a native specie of the arid areas of asia and africa, but nowadays is also distributed in america and other areas with tropical and sub-tropical climate. it is a very resistant plant that presents excellent medicinal properties. the objective of this study was to define the ideal germination conditions for neem (azadirachta indica a. juss.) seeds evaluating the most appropriate substrates, temperature and characterizing its post-seminal morphology. seeds were sown on vermiculite, sand and towel paper and maintained in a germinator at 25°c, 30°c, 35°c and 20-30°c. a complete randomized design was used, with 25 seeds sown in four replications, and the germination percentage was evaluated. the best results were obtained for temperature of 35°c in vermiculite and towel paper substrates and countings performed at 15 and 30 days after sowing. normal seedlings were classified as epigeal germination.
Compostos fenólicos inibidores da germina??o em sementes de mam?o (Carica papaya)
Tokuhisa, Daí;Dias, Denise Cunha Fernandes dos Santos;Alvarenga, Eveline Mantovani;Hilst, Paulo Cèsar;Demuner, Ant?nio Jacinto;
Revista Brasileira de Sementes , 2007, DOI: 10.1590/S0101-31222007000300022
Abstract: the slow and erratic germination of papaya seeds has been attributed to inhibitors present in the sarcotesta. this study was undertaken to evaluate the inhibition effect of sarcotesta extract on lettuce seed germination and to quantify phenolic compounds in papaya seeds. papaya fruits of the formosa group, hybrid tainung 01, were harvested in may and september/2005. at each harvest time, seeds with and without sarcotesta were obtained and the germination percentage was evaluated at 15 and 30 days after seeding. a bioassay was performed with lettuce seeds, which germinated in substratum moistened with water (control) and with solutions obtained from papaya sarcotesta extract. the phenolic compounds were quantified in different structures of papaya seeds (sarcotesta, esclerotesta, endosperm and embryo), using tannic acid as standard and the color reaction with folin-ciacalteau reagent measured at 765 nm by spectrophotometry. the bioassay indicated that sarcotesta extract inhibits the germination and growth of the lettuce seedling primary roots due to the presence of inhibitory substances (phenols). a high amount of these substances was found in the papaya seed esclerotesta, followed by the sarcotesta, but there was practically no concentration of these compounds in the embryo and endosperm. seeds extracted from fruits harvested in may 2005 had dormancy and higher phenolic content compared to seeds harvested in september 2005, which did not exhibit dormancy.
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