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Search Results: 1 - 10 of 179782 matches for " Ruy Inacio Neiva de Carvalho "
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Qualidade fisiológica de sementes de guanxuma sob influência do envelhecimento acelerado e da luz
Carvalho, Denise Bruginski de;Carvalho, Ruy Inacio Neiva de;
Acta Scientiarum. Agronomy , 2009, DOI: 10.4025/actasciagron.v31i3.585
Abstract: the objective of this study was to determine the effect of accelerated aging and presence of light on the physiological quality of arrowleaf sida (sida rhombifolia l.) seeds. four accelerated aging times (0, 24, 48 and 72 hours), as well as the presence or absence of light during germination test, were evaluated by using a randomized block design, with a 4 x 2 factorial scheme and three replications. seeds were germinated in germination boxes (gerbox) lined with paper, at 25oc. the variables analyzed were: germination percentage, germination speed index (gsi), average germination time (agt), average germination speed (ags) and entropy. evaluations were made 63 days after installation of the test. absence of light favored germination and gsi. both agt and entropy diminished as accelerated aging time increased, but were not influenced by light. germination and agt diminished under longer accelerated aging periods in the presence of light. it was possible to conclude that accelerated aging of arrowleaf sida seeds up to 72 hours increased the physiological quality of seeds germinated in darkness.
Qualidade fisiológica de sementes de guanxuma em influência do envelhecimento acelerado e da luz = Influence of accelerated aging and light on the physiological quality of arrowleaf sida seeds
Denise Bruginski de Carvalho,Ruy Inacio Neiva de Carvalho
Acta Scientiarum : Agronomy , 2009,
Abstract: O objetivo deste trabalho foi determinar o efeito do envelhecimento acelerado e da presen a da luz na qualidade fisiológica de sementes de guanxuma (Sida rhombifolia L.). Foram estudados quatro tempos de envelhecimento acelerado (0, 24, 48 e 72h) e a presen a ou ausência de luz no teste de germina o. O delineamento experimental adotado foi em blocos casualizados num esquema fatorial 4 x 2, com três repeti es. Adotou-se o método de germina o sobre papel em caixa de plástico (Gerbox) à temperatura de 25°C. Analisaram-se as variáveis porcentagem de germina o, índice de velocidade de germina o(IVG), tempo médio para germina o (TMG), velocidade média de germina o (VMG) e entropia. As avalia es foram realizadas durante 63 dias após a instala o do teste. A ausência de luz favoreceu a germina o e o IVG das sementes de guanxuma. O TMG e a entropiadiminuíram e a VMG aumentou com o aumento do tempo de envelhecimento acelerado e n o foram influenciados pela luz. Na presen a de luz, a germina o e o IVG foram reduzidos com tempos de envelhecimento acelerado mais longos. Conclui-se que o envelhecimento acelerado de sementes de guanxuma por até 72h proporcionou aumento na qualidade fisiológica das sementes submetidas à germina o no escuro. The objective of this study was to determine the effect ofaccelerated aging and presence of light on the physiological quality of arrowleaf sida (Sida rhombifolia L.) seeds. Four accelerated aging times (0, 24, 48 and 72 hours), as well as the presence or absence of light during germination test, were evaluated by using a randomizedblock design, with a 4 x 2 factorial scheme and three replications. Seeds were germinated in germination boxes (Gerbox) lined with paper, at 25°C. The variables analyzed were: germination percentage, germination speed index (GSI), average germination time (AGT),average germination speed (AGS) and entropy. Evaluations were made 63 days after installation of the test. Absence of light favored germination and GSI. Both AGT and entropy diminished as accelerated aging time increased, but were not influenced by light. Germination and AGT diminished under longer accelerated aging periods in the presence of light. It was possible to conclude that accelerated aging of arrowleaf sida seeds up to 72 hours increased the physiological quality of seeds germinated in darkness.
Germination of seeds of a paspalum ecotype from Guarapuava, Paraná State / Germina o de sementes de um ecótipo de paspalum da regi o de Guarapuava – Pr
Ruy Inacio Neiva de Carvalho,Denise Bruginski de Carvalho
Semina : Ciências Agrárias , 2009,
Abstract: The objective of this research was to evaluate the effect of the caryopsis classification, the acid scarification and the treatment with potassium nitrate in the seed germination of a Paspalum notatum Flügge ecotype from the Guarapuava region, Paraná State. The experimental design was the completely randomized in a factorial arrangement with three factors: caryopsis classes (three classes gotten in a seed blower in openings four, five and six), sulfuric acid concentrated treatment period (0, 7.5 and 15 minutes) and potassium nitrate concentration (0 and 0.2 %). The seed germination was evaluated after 7, 14, 21 and 28 days. The germination percentage, the germination speed index and the average time to germination were evaluated. The best germination obtained was 12.2% for the seeds of class six scarified for 15 minutes. Seeds from class four and not treated with sulfuric acid did not germinate. There was no interference of potassium nitrate treatment on seed germination. The classification and the acid scarification of the caryopsis were favorable to increase P. notatum seed germination. O objetivo da pesquisa foi verificar o efeito da classifica o das cariopses, da escarifica o ácida e do tratamento com nitrato de potássio na germina o das sementes de um ecótipo de Paspalum notatum Flügge da regi o de Guarapuava, Paraná. Adotou-se o delineamento experimental completamente casualizado em arranjo fatorial com três fatores: classe das cariopses (três classes obtidas em soprador de sementes nas aberturas quatro, cinco e seis), tempo de tratamento com ácido sulfúrico concentrado (0, 7,5 e 15 minutos) e concentra o de nitrato de potássio (0 e 0,2%). Foram avaliados a germina o após 7, 14, 21 e 28 dias, o índice de velocidade de germina o e o tempo médio para germina o. A maior germina o obtida foi de 12,2% para as sementes da classe seis do soprador e escarificadas por 15 minutos. N o ocorreu germina o das sementes da classe quatro que n o receberam escarifica o ácida e n o houve interferência do nitrato de potássio. Concluiu-se que a classifica o e a escarifica o ácida das cariopses favoreceram a germina o das sementes de P. notatum.
Varia??es do conteúdo de glucose, frutose e sorbitol em gemas e ramos de macieira durante a dormência
Carvalho, Ruy Inacio Neiva de;Zanette, Flávio;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000600040
Abstract: this research was aimed at evaluating the variations of glucose, frutose and sorbitol content in one year old buds and stems of apple trees during the dormancy period. the stems of cv. imperial gala were collected in porto amazonas, parana state, brazil, at intervals of 21 days from april to august (april 19th, may 10th, may 31st, june 21st, july 12th, august 2nd and august 23rd) and were treated or not with 1,440 hours of chill (4 to 7°c). the carbohydrates were analysed in buds and stem tissues close to buds by high performance liquid chromatography (hplc). there was an increase of glucose, frutose and sorbitol content in apple tree buds during the dormancy. an increase of glucose and frutose content in stems occured until august 2nd followed by a significative reduction, while the sorbitol content decreased until june 21st followed by an increase until august 31st. the chill treatment during the dormancy period modified the variations of carbohydrate contents in buds and stems of apple tree.
Dinamica do conteúdo de monossacarídeos em gemas e ramos de dois anos de macieira durante a endodormência
Carvalho, Ruy Inacio Neiva de;Zanette, Flávio;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000400014
Abstract: the objective of this work was to evaluate the variation of glucose, fructose and sorbitol content in two year old buds and stems of apple trees during the dormancy period. stems of cv. imperial gala were collected in porto amazonas, parana state, brazil, a region of low chill occurence, at intervals of 21 days from april to august and were treated or not with 1,440 hours of chill (4 to 7°c). the monosaccharides were analysed in buds and stem tissues close to buds by high performance liquid chromatography (hplc). there was an increase of glucose and fructose content in buds from april to august and it was stimulated by the chill treatment. the glucose and fructose content in stems increased from april to august 2nd followed by a reduction in august 23rd and the chill treatment advanced this dynamics. the sorbitol content in buds and stems of apple tree oscillated from april to august and its dynamics was modified by the chill treatment.
Varia??es do conteúdo de carboidratos em gemas e ramos de dois anos de macieira em regi?o de baixa ocorrência de frio
Carvalho, Ruy Inacio Neiva de;Zanette, Flávio;
Revista Brasileira de Fruticultura , 2005, DOI: 10.1590/S0100-29452005000300004
Abstract: this work aimed to quantify the variation of carbohydrate content in two year old buds and stems of apple trees cv. 'imperial gala' with or without supplementary chill during autumn and winter, cultivated in a region of low chill occurence. the stems were collected in porto amazonas, parana state, brazil, at intervals of 21 days from april to august (april 19th, may 10th, may 31st, june 21st, july 12th, august 2nd and august 23rd) and were either treated or not with 1,440 hours of chill (4 to 7° c). the carbohydrates were analysed in buds and stem tissues adjacent to the buds. the soluble carbohydrates (sc) were evaluated by the phenol-sulfuric acid method and the final determination was achieved by spectrophotometry (490 nm absorbency). the non-soluble carbohydrates (nc) were estimated by the mass of vegetal tissues insoluble in alcohol and soluble in alcaline medium, after freeze drying. significant variations of carbohydrate content were observed in the two year old buds and stems during the dormancy. the increase of dormancy intensity in autumn is associated with the reduction of sc content in buds. the treatment with 1,440 hours of chill modify the variations of sc content in stems and nc content in buds.
Dinamica da dormência de gemas de dois anos de macieira 'Imperial Gala' em regi?o de baixa ocorrência de frio
Carvalho, Ruy Inacio Neiva de;Zanette, Flávio;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000300005
Abstract: this work aims to evaluate the dormancy dynamics of two year old apple tree buds with or without supplementary chill during autumn and winter, in a region of low chill occurence. the stems were collected in porto amazonas, parana state, brazil, at intervals of 21 days from april to august (april 19th, may 10th, may 31st, june 21st, july 12th, august 2nd and august 23rd) and were either treated or not with 1,440 hours of chill (4 to 7° c). the evaluation of dormancy was observed through the biological test of single node cuttings under controlled conditions (25° c and long days of 16 hours) by the following parameters: average time for budburst (tmb), velocity of budburst (vb), final rate of budburst (tf), rate of vigorous budburst (tbv) and average time for open leaves to appear (tmfa). the most intense dormancy occured on may 31st, but presented variations until august. the chilly treatment with 1,440 hours (4 to 7° c) was effective in reducing the average time for budburst. non-dormant buds under favorable developing conditions present good growth potencial.
Conteúdo de carboidratos em gemas e ramos de macieira durante o outono e inverno em regi?o de baixa ocorrência de frio
Carvalho, Ruy Inacio Neiva de;Zanette, Flávio;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000200005
Abstract: this work aimed at evaluating the carbohydrate content of one year old buds and stems of apple trees cv. 'imperial gala' with or without supplementary chill during autumn and winter, cultivated in a region of low chill occurence. the stems were collected in porto amazonas, parana state, brazil, at intervals of 21 days from april to august (04/19, 05/10, 05/31, 06/21, 07/12, 08/02 and 08/23) and were treated or not with 1,440 hours of chill (4 to 7° c). the carbohydrates were analysed in buds and stem tissues close to the buds. the soluble carbohydrates (sc) were evaluated by the phenol-sulfuric acid method and the final determination was made by spectrophotometry (490 nm absorbance). the non-soluble carbohydrates (nc) were estimated by the mass of vegetal tissues non-soluble in alcohol and soluble in alcaline medium, after freeze drying. the total carbohydrate (sc + nc) content represented 13.8 to 20.2 g.100g-1 of dry matter of buds and 9.9 to 15.3 g.100g-1 of dry matter of stems. the buds presented a higher level of sc in the initial dormancy period and a higher level of nc in the more intense dormancy period. the nc accumulation in buds were anticipated by the early chill treatment and the chill treatment during endodormancy promoted the sc accumulation. the sc content in stems increased along the dormancy development while the nc content remained constant.
Dinamica da dormência de gemas de macieira 'Imperial Gala' durante o outono e inverno em regi?o de baixa ocorrência de frio
Carvalho, Ruy Inacio Neiva de;Zanette, Flávio;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000100018
Abstract: this work aimed to evaluate the dormancy dynamics of one year old apple tree buds with or without supplementary chill during autumn and winter, in a region of low chill occurence. the stems were collected in porto amazonas, parana state, brazil, at intervals of 21 days from april to august (04/19, 05/10, 05/31, 06/21, 07/12, 08/02 and 08/23) and were treated or not with 1,440 hours of chill (4 to 7° c). the evaluation of dormancy was observed by the biological test of single node cuttings under controlled conditions (25° c and long days of 16 hours) by following parameters: average time for budburst (tmb), velocity of budburst (vb), final rate of budburst (tf), rate of vigorous budburst (tbv) and average time for appereance of opened leaves (tmfa). the more intense dormancy occured on july, 12. the chill treatment with 1,440 hours (4 to 7° c) was effective in reducing the average time for budburst. the use of tbv in single node cuttings test was an important method to evaluate the real capacity of bud development, reducing the interference of cut like an initial development estimulator.
Avalia o de diferentes métodos de sobre-enxertia na substitui o da cultivar de macieira (Malus domestica Borkh.) Gala por Princesa = Evaluation of different over-grafting techniques to replace 'Gala' for 'Princesa' apple trees (Malus domestica Borkh.)
Fabiano Sim?es,Ruy Inacio Neiva de Carvalho
Acta Scientiarum : Agronomy , 2006,
Abstract: Foram comparados quatro métodos de enxertia: garfagem em inglês complicado (GIC); borbulhia lenhosa (BL); garfagem de topo (GT) e garfagem meia-fenda esvaziada (GMFE), com o objetivo de avaliar o melhor método para execu o da sobre-enxertia na substitui o da cultivar de macieira Gala por Princesa. O experimento foi conduzido em S o José dos Pinhais – PR, em seis macieiras localizadas em pomar com três anos de idade. As características avaliadas foram: porcentagem de pegamento dos enxertos, porcentagem de enxertos brotados, porcentagem de enxertos dormentes e porcentagem de enxertos mortos. O experimento foi finalizado após 62 dias da instala o. Após esse período conclui-se que a GIC apresentou maiores porcentagens de pegamento e brota o. Esta n o se diferenciou da GT em rela o à variável pegamento. A BL n o é recomendada para a sobre-enxertia em macieiras. Four grafting methods were compared: whip graft, budding graft, cleft graft and the side graft, aiming at evaluating the best techniqueto replace ‘Gala’ for ‘Princesa’ apple trees. The experiment was held in S o José dos Pinhais – PR in a 3-year old apple tree yard fruit. Six apple trees were selected for the experiment. The assessed characteristics were carried out by the percentage of grafting success (sprouted), sleeping grafts (no sprouts) and dead ones. The experiment was concluded after 62 days of grafting. Results indicated that the budding graft showed to be more effective with a higher index of sprouting. This technique showed no difference concerning the sprouting percentage compared to the whip graft. The budding graft is not recommended to over–graft apple trees.
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