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Search Results: 1 - 10 of 41022 matches for " Ernany Santos;Bressan-Smith "
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Photochemical efficiency in bean plants (Phaseolus vulgaris L. and Vigna unguiculata L. Walp) during recovery from high temperature stress
Costa, Ernany Santos;Bressan-Smith, Ricardo;Oliveira, Jurandi Gon?alves de;Campostrini, Eliemar;Pimentel, Carlos;
Brazilian Journal of Plant Physiology , 2002, DOI: 10.1590/S1677-04202002000200004
Abstract: bean (phaseolus vulgaris l., cv. carioca and cv. negro huasteco) and cowpea plants (vigna unguiculata l. walp cv. epace 10) were grown in a growth chamber with ppf at leaf level of 200 mmol.m-2.s-1 and air temperature 25 + 1 oc. the first fully expanded pair of leaves of 12-day-old plants was submitted to high temperature stress (25, 30, 35, 40, 45 and 48 oc) for 1.5 h. the photochemical efficiency of psii during recovery was monitored by means of chlorophyll a fluorescence at six different times (0.5, 1, 2, 4, 24, and 48 h) after stress, at 25 oc, using a modulated fluorimeter. increasing temperature promoted an increase in ff at 45 oc, possibly associated with dissociation of the light harvesting complex from the reaction centre of psii, but a decrease was observed at 48 oc in all cultivars. fmax decreased at 48 oc in carioca and negro huasteco, but not in epace 10, showing a possible correlation between heat tolerance and fmax for this cultivar. the low values of fmax in carioca and negro huasteco indicated a loss of psii activity followed by death of these plants. fv/fmax did not vary in epace 10 but varied in carioca and negro huasteco with increasing temperatures.
Photochemical efficiency in bean plants (Phaseolus vulgaris L. and Vigna unguiculata L. Walp) during recovery from high temperature stress
Costa Ernany Santos,Bressan-Smith Ricardo,Oliveira Jurandi Gon?alves de,Campostrini Eliemar
Brazilian Journal of Plant Physiology , 2002,
Abstract: Bean (Phaseolus vulgaris L., cv. Carioca and cv. Negro Huasteco) and cowpea plants (Vigna unguiculata L. Walp cv. Epace 10) were grown in a growth chamber with PPF at leaf level of 200 mumol.m-2.s-1 and air temperature 25 + 1 oC. The first fully expanded pair of leaves of 12-day-old plants was submitted to high temperature stress (25, 30, 35, 40, 45 and 48 oC) for 1.5 h. The photochemical efficiency of PSII during recovery was monitored by means of chlorophyll a fluorescence at six different times (0.5, 1, 2, 4, 24, and 48 h) after stress, at 25 oC, using a modulated fluorimeter. Increasing temperature promoted an increase in Fphi at 45 oC, possibly associated with dissociation of the light harvesting complex from the reaction centre of PSII, but a decrease was observed at 48 oC in all cultivars. Fmax decreased at 48 oC in Carioca and Negro Huasteco, but not in Epace 10, showing a possible correlation between heat tolerance and Fmax for this cultivar. The low values of Fmax in Carioca and Negro Huasteco indicated a loss of PSII activity followed by death of these plants. Fv/Fmax did not vary in Epace 10 but varied in Carioca and Negro Huasteco with increasing temperatures.
Genetic linkage map of Phaseolus vulgaris and identification of QTLs responsible for resistance to Xanthomonas axonopodis pv. phaseoli
Santos, Amaury S.;Bressan-Smith, Ricardo E.;Pereira, Messias G.;Rodrigues, Rosana;Ferreira, Claudia F.;
Fitopatologia Brasileira , 2003, DOI: 10.1590/S0100-41582003000100001
Abstract: common bean (phaseolus vulgaris) cultivars with a high degree of resistance to xanthomonas axonopodis pv. phaseoli (xap) are not available in brazil. despite many studies, a low degree of resistance to xap continues to exist due to its complex genetic inheritance, which is not well known. the objectives of this research were to complement a common bean genetic map based on the cross between a susceptible genotype 'hab-52' and a resistant genotype 'bac-6', and to map and analyze genomic regions (quantitative trait loci – qtls) related to xap resistance. eleven linkage groups were determined using 143 rapd markers, covering 1,234.5 cm of the genome. this map was used to detect qtls associated with xap resistance on leaves and pods. the averages of disease severity on leaves (represented by the transformed disease index – tdi) and pods (represented by the diameter of lesion on pods – dlp) were added to the data of the linkage map. five tdi qtls and only one ldp qtl were detected. the tdi qtls were placed in the a, b, g and j linkage groups, with phenotypic variations ranging from 12.7 to 71.6%. the dlp qtl explained 12.9% of the phenotypic variation and was mapped in a distinct linkage group. these results indicate that there are different genes involved in the control of resistance on leaves and pods.
Genetic linkage map of Phaseolus vulgaris and identification of QTLs responsible for resistance to Xanthomonas axonopodis pv. phaseoli
Santos Amaury S.,Bressan-Smith Ricardo E.,Pereira Messias G.,Rodrigues Rosana
Fitopatologia Brasileira , 2003,
Abstract: Common bean (Phaseolus vulgaris) cultivars with a high degree of resistance to Xanthomonas axonopodis pv. phaseoli (Xap) are not available in Brazil. Despite many studies, a low degree of resistance to Xap continues to exist due to its complex genetic inheritance, which is not well known. The objectives of this research were to complement a common bean genetic map based on the cross between a susceptible genotype 'HAB-52' and a resistant genotype 'BAC-6', and to map and analyze genomic regions (quantitative trait loci - QTLs) related to Xap resistance. Eleven linkage groups were determined using 143 RAPD markers, covering 1,234.5 cM of the genome. This map was used to detect QTLs associated with Xap resistance on leaves and pods. The averages of disease severity on leaves (represented by the transformed disease index - TDI) and pods (represented by the diameter of lesion on pods - DLP) were added to the data of the linkage map. Five TDI QTLs and only one LDP QTL were detected. The TDI QTLs were placed in the A, B, G and J linkage groups, with phenotypic variations ranging from 12.7 to 71.6%. The DLP QTL explained 12.9% of the phenotypic variation and was mapped in a distinct linkage group. These results indicate that there are different genes involved in the control of resistance on leaves and pods.
Photosynthesis and cell respiration modulated by water deficit in grapevine (Vitis vinifera L.) cv. Cabernet Sauvignon
Martim, Sílvia A.;Santos, Mirella P.;Pe?anha, Anderson L.;Pommer, Celso;Campostrini, Eliemar;Viana, Alexandre P.;Fa?anha, Arnoldo R.;Bressan-Smith, Ricardo;
Brazilian Journal of Plant Physiology , 2009, DOI: 10.1590/S1677-04202009000200002
Abstract: winegrape productivity and quality has been related to the regulated deficit irrigation, with important implications for the plant bioenergetics. when water deficit is imposed to grapevine plants, alterations in overall photosynthesis and cell respiration are observed. the aim of this study was to assess the modulations promoted by water stress on photosynthesis and respiration in leaves of the cv. cabernet sauvignon (cv. cs) for better understanding the physiological responses related to its drought tolerance and quality improvement under water deficit. for this purpose, measurements of photosynthetic efficiency, leaf water potential, gas exchange and o2 consumption were carried out. leaf water potential, photosynthesis, stomatal conductance, transpiration and internal carbon concentration were significantly reduced upon stress, suggesting that plants of cv. cs present higher water use efficiency (an/e) and lower carboxylative capacity (an/ci) under this condition. on the other hand, cell respiration increased more than 70 % as estimated by the increase of o2 consumption measured 12 days after suspension of irrigation. most of this effect was related to a four-fold increase of the mitochondrial alternative oxidase (aox) activity. these data indicate a key role for the aox pathway in the physiological responses of grapevines to water deficit, and it implies that analyses of the aox activation patterns should be useful for programs aiming to improve the consistency of fruit production and quality of winegrape cultivars by regulated deficit irrigation.
Papaya pulp gelling: is it premature ripening or problems of water accumulation in the apoplast?
Oliveira, Jurandi Gon?alves de;Bressan-Smith, Ricardo Enrique;Campostrini, Eliemar;Cunha, Maura Da;Costa, Ernani Santos;Torres Netto, Alena;Coutinho, Kelly da Silva;SILVA, Marcelo Gomes da;Vitória, Angela Pierre;
Revista Brasileira de Fruticultura , 2010, DOI: 10.1590/S0100-29452011005000003
Abstract: gelled aspect in papaya fruit is typically confused with premature ripening. this research reports the characterization of this physiological disorder in the pulp of papaya fruit by measuring electrolyte leakage, pi content, lipid peroxidation, pulp firmness, mineral contents (ca, mg and k - in pulp and seed tissues), and histological analysis of pulp tissue. the results showed that the gelled aspect of the papaya fruit pulp is not associated with tissue premature ripening. data indicate a reduction of the vacuole water intake as the principal cause of the loss of cellular turgor; while the waterlogged aspect of the tissue may be due to water accumulation in the apoplast.
Caracteriza??o e avalia??o agron?mica de híbridos e linhagens de milho doce (su1)
Oliveira Jr, Luiz Fernando G;Pereira, Messias G;Bressan-Smith, Ricardo;
Horticultura Brasileira , 2006, DOI: 10.1590/S0102-05362006000300003
Abstract: two sweet-corn (su-1 mutant and common-corn) hybrids, as well as the respective parentals and donators, summing up 11 genetic materials, were evaluated in two environments, in itaocara and campos dos goytacazes, rio de janeiro state, brazil. the sweet-corn hybrids were obtained by simple crosses between sweet-corn parentals carrying the gene su-1, transferred by backcross. heterosis, the genotypic determination coefficient and morphoagronomic traits were evaluated. the experimental design consisted of randomized blocks, with two replications in each environment. four-row plots, 5-m long, were used. the two sweet-corn hybrids overcame their parentals and donators. comparison between sweet- and common-corn hybrids showed no significant differences. heterosis was detected in almost all traits, as for example, yield of ears without straw and percent of ears damaged by pests, as well as significant genotypic influence, revealed by the genotypic determination coefficient.
Structural interaction between GFP-labeled diazotrophic endophytic bacterium Herbaspirillum seropedicae RAM10 and pineapple plantlets 'Vitória'
Baldotto, Lílian Estrela Borges;Olivares, Fábio Lopes;Bressan-Smith, Ricardo;
Brazilian Journal of Microbiology , 2011, DOI: 10.1590/S1517-83822011000100015
Abstract: the events involved in the structural interaction between the diazotrophic endophytic bacterium herbaspirillum seropedicae, strain ram10, labeled with green fluorescent protein, and pineapple plantlets 'vitória' were evaluated by means of bright-field and fluorescence microscopy, combined with scanning electron microscopy for 28 days after inoculation. after 6 hours of inoculation, h. seropedicae was already adhered to the roots, colonizing mainly root hair surface and bases, followed by epidermal cell wall junctions. bacteria adherence in the initial periods occurred mainly in the form of solitary cells and small aggregates with pleomorphic cells. bacteria infection of root tissue occurred through the cavities caused by the disruption of epidermal cells during the emergence of lateral roots and the endophytic establishment by the colonization of intercellular spaces of the cortical parenchyma. moreover, within 1 day after inoculation the bacteria were colonizing the shoots. in this region, the preferred sites of epiphytic colonization were epidermal cell wall junctions, peltate scutiform trichomes and non-glandular trichomes. subsequently, the bacteria occupied the outer periclinal walls of epidermal cells and stomata. the penetration into the shoot occurred passively through stoma aperture followed by the endophytic establishment on the substomatal chambers and spread to the intercellular spaces of spongy chlorenchyma. after 21 days of inoculation, bacterial biofilm were seen at the root hair base and on epidermal cell wall surface of root and leaf, also confirming the epiphytic nature of h. seropedicae.
Potencial climático para a produ??o de uvas em Campos dos Goytacazes, regi?o norte Fluminense
Pommer, Celso Valdevino;Mendes, Luciane Siqueira;Hespanhol-Viana, Landro;Bressan-Smith, Ricardo;
Revista Brasileira de Fruticultura , 2009, DOI: 10.1590/S0100-29452009000400022
Abstract: multicriteria climatic classification system (geoviticulture mcc system) based on three climate indexes, the dryness index (di), which corresponds to an indicator of the dryness level, the heliothermal index (hi), which corresponds to huglin's heliothermal index, and the cool night index (ci), that acts as an indicator of night temperature conditions during berry maturation, was able to describe the climatic potential for vineyards around the world. in this study we characterized the viticulture climate on twelve growth-production periods during a year with four months duration each, in the north region of the state of rio de janeiro, represented by campos dos goytacazes municipality (21o 45's, 41o 19'w, 13 m). the system indicated that the region has potential for grape production during the year through markedly differences in di, hi and ci indexes. the 4-months periods of january/april, february/may, march/june, april/july, may/august, june/september, july/october and august/november were considered the most suitable for grape production, as the indexes show: is+1 indicating moderate drought class, ih-2 to ih-1, for cold to temperate classes, except for january/april, with ih+1, for temperate warm class, and if-2 to if-1 from warm to temperate nights classes. it can be seen that these periods shows climatic potential, and as allowing adequate plant growth, are satisfactory also for diminishing needs of sprayings and coinciding with low product offer and higher prices, what turns the region with suitability for more than one cycle per year. in this study, the system allowed the distinction of periods of grape-growing throughout a year, acting as appropriate tool for viticulture zoning.
Sele??o de genótipos de milho mais promissores para o consumo in natura
Oliveira Jr., Luiz Fernando Ganassali;Deliza, Rosires;Bressan-Smith, Ricardo;Pereira, Messias Gonzaga;Chiquiere, Tatiana Barroso;
Ciência e Tecnologia de Alimentos , 2006, DOI: 10.1590/S0101-20612006000100026
Abstract: six genotypes belonging to the uenf sweet corn improvement program: h43in, p43, c43, 43in, hdc and uenf506-8 were evaluated aiming at identifying those with better agronomic characteristics and preferred for the consumption of corn on the cob. this investigation was conducted from september 2003 to january 2004, following a randomized complete block design, with four replications and two locations. the following agronomic traits were evaluated: yield with straw (prcp), productivity without straw (prsp), percentage of commercial ears (ec), length of ears without straw (cesp), diameter of ears without straw (of) and ears yielding (r). besides, the consumer preference for the products in relation to the flavor, sweetness, and softness was investigated. the results have shown that one of the most suitable genotype for the corn on the cob consumption considering the agronomic characteristics was the common hybrid uenf506-8. however, by looking at preference results it was verified that the referred hybrid did not reach adequate acceptance by consumers due to its softness and sweetness. the hybrids h43in and hdc were considered more suitable for the green corn consumption.
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