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Search Results: 1 - 10 of 84659 matches for " Durvalina Maria Mathias dos; "
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Ensaios sobre a metodologia do estudo da influência de três herbicidas em Spirodela punctata (G.F.W. Meyer) Thompson (Lemnaceae)
Santos, Durvalina Maria Mathias dos;Marinis, Giorgio de;
Acta Botanica Brasilica , 1988, DOI: 10.1590/S0102-33061988000300021
Abstract: the present work looks for a knowledge of multiplícate rate and mortality index of. s. punctata to several concentrations of butachlor, propanil and gliphosate as well as to compare two different methods. on essay 1 the concentrations were a little toxic provoking low index of mortality in spite of it has occured inhibition of increasing on stronger concentrations. the essay 2 showed what, the butachlor and the propanil are more toxics than the gliphosate, with values of mortality of 100% in only 48 hours. the multiplícate rate, on this essay, was only determinated to the gliphosate, because the other herbicides were highly toxic to the species. it was checked on the comparation of the two different methods the posts used on essay 2 were more appropriate to the cultive specie and the toxic effects must be observated on considered individualy and not on whole plants.
Indicadores fisiológicos da intera??o entre deficit hídrico e acidez do solo em cana-de-a?úcar
Carlin, Samira Domingues;Santos, Durvalina Maria Mathias dos;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009000900006
Abstract: the aim of this work was to assess the physiological indicators of the interaction between water deficit and soil acidity, in sugarcane. the plants were submitted to three treatments of water availability - no stress (70% of field capacity, fc), moderate stress (55% fc), and extreme stress (40% fc); and three acidity treatments - no acidity [base saturation (v) = 55%], average acidity (v = 33%), and high acidity (v = 23%). the experiment was carried out in greenhouse, with 29.7±4.3oc and 75±10% rh. the experimental design was in randomized blocks, in 3x3 factorial arrangement, with four replicates. after 60 days, the contents of compatible solutes - trehalose, glycine betaine and proline - in the diagnostic leaf and the initial growth of shoots were determined. the compatible solutes trehalose, glycine betaine, and proline are indicators of the interaction of water and acidity stresses in the soil. the accumulation of compatible solutes in plant foliar tissues can not prevent sugarcane losses in dry matter production, caused by increasing water deficit and soil acidity.
Intera??o da deficiência hídrica e da toxicidade do alumínio em guandu cultivado em hidroponia
Marin, Ad?o;Santos, Durvalina Maria Mathias dos;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008001000003
Abstract: the objective of this work was to evaluate the interaction effect of water stress and aluminum toxicity on the initial growth and free proline contents in two cultivars of pigeon pea, iapar 43-arat? and iac fava larga, cultivated in hydroponics. the seedlings were submitted to stresses in nutritive solution (ph 3.8), osmotic potentials 0, -0.004, -0.006, -0.008 and -0.010 mpa, with 0, 0.25, 0.50, 0.75 and 1 mmol dm-3 al3+ . the experiment was carried out in a plant growth room, under a luminary unit of average irradiance 190 mmol m-2 s-1 , 12-hour photoperiod and 25+1oc temperature. a completely randomized experimental design was used in factorial arrangement 2x5x5 (two pigeon pea cultivars, five osmotic potential and five levels), with four replicates. data were submitted to analyses of polynomial regression, cluster and main components. water stress causes growth reduction of pigeon pea aerial part, whereas aluminum toxicity causes radicular growth reduction. there was increase of free proline contents in the two cultivars under water stress, and only in iac fava larga under aluminum toxicity. multivariate analysis showed high correlation in growth and accumulation of proline for cultivar iac fava larga, evidencing probable tolerance to associated stresses.
Desenvolvimento inicial da parte aérea e do sistema radicular do guandu, Cajanus cajan (L.) Millsp
Santos, Durvalina Maria Mathias dos;Rodrigues, Teresinha de Jesus Deléo;Banzatto, David Ariovaldo;
Acta Botanica Brasilica , 1998, DOI: 10.1590/S0102-33061998000400019
Abstract: the objective of this study was to analyse the early development of two cultivars of the pigeonpea (cajanus cajan (l.) millsp.), namely iac-fava larga (c1), icp-7035 (c3) and the inbred line iac-87318 (c2), at 14, 28 and 42 days after sowing (das). the experiment was conducted under greenhouse conditions, and the following characteristics were evaluated: height (cm), leaf number, leaf area (dm2), root density (cm/cm3 of soil), and dry mass (g) of the stems, leaf blades and roots. the experiment was conducted under a completely randomized design with three replications. the means of growth of the cultivars were compared by tukey's test, at each sampling date. cultivar c2 presented the highest growth of the root system at 14, 28 and 42 das. cultivars c3 and c1 presented less vigorous seedlings, with fewer roots. the roots of c1, c2 and c3, were 60cm deep at 14 das, and the roots of c2 and c3 reached 100cm at 42 das.
Germina??o de sementes de guandu sob efeito da disponibilidade hídrica e de doses subletais de alumínio
Marin, Ad?o;Santos, Durvalina Maria Mathias dos;Banzatto, David Ariovaldo;Ferraudo, Antonio Sergio;
Bragantia , 2004, DOI: 10.1590/S0006-87052004000100002
Abstract: the aim of the work was to evaluate the effect associated with water stress and aluminum sublethal doses on seed germination of pigeonpea, iapar 43-arat? and iac fava larga cultivars. the experiment was carried out at faculdade de ciências agrárias e veterinárias-unesp, in jaboticabal, s?o paulo state, from march to may 2002. the seeds germinated in germination boxes lined with blotters moistened with solutions of polyethyleneglycol, peg 6000 (0,0; -0,6; -0,9, -1,2 e -1,5 mpa) and aluminum sulphate (0,0; 2,5; 5,0; 7,5; e 10,0 mmol.dm-3). the experimental design was a complete randomized in factorial arrangement 2 x 5 x 5 (2 cultivars; 5 water stresses; 5 aluminum doses) and four replications of 50 seeds. the statistical analysis was complemented with the clustering analysis and principal component analysis. seed germination was evaluated, four and ten days after sowing. the experiment was conducted in germination chamber at 25 °c ± 1 °c. on the tenth day, the seedlings were separated in plumule and radicle for dry mass determination. the water stress appeared to be the critical limiting factor for germination and seedling establishment. the joint effects of water stress and aluminum were significantly greater at moderate water stress, the effects of aluminum being more pronounced only when severe water stress was absent. the germination of the iapar 43-arat? cultivar and the roots growth of the iac fava larga cultivar were reduced, respectively, by water stress and aluminum.
Influência da disponibilidade hídrica e da acidez do solo no teor de prolina livre de guandu
Marin, Ad?o;Santos, Durvalina Maria Mathias dos;Banzatto, David Ariovaldo;Codognotto, Lucas Mateus;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006000200023
Abstract: the objective of this work was to evaluate the influence of water availability and soil acidity on the levels of free proline, in shoots of the pigeon pea cultivars iapar 43-arat? and iac fava larga. a completely randomized design, in a factorial scheme 2x3x4 (two cultivars, two levels of water availability, four ph levels), with four replicates was used. under severe water restriction, the cultivar iac fava larga can be considered more tolerant, because of its higher accumulation of free proline. the presence of aluminium, associated to severe water restriction, showed a synergistic effect on the levels of free proline.
Nitrate reductase enzyme activity and free proline contents in sugarcane roots under water and acid stress in soil Atividade da enzima redutase do nitrato e teores de prolina livre em raízes de cana-de-a úcar sob os estresses hídrico e ácido no solo
Andressa Freitas de Lima Rhein,Durvalina Maria Mathias dos Santos,Samira Domingues Carlin
Semina : Ciências Agrárias , 2011,
Abstract: The aim of this work was evaluate the physiological indicators of association between water deficiency and soil acidity, by determining the nitrate reductase activity, the levels of free proline and initial growth of the root system of seedlings of sugarcane cv. IAC91-5155. After 30 days, the seedlings were transferred to plastic pots with 12 dm3 of dystrophic alic Red Latosol (Oxisol) and submitted to association of three treatments of water availability: no stress (70%), moderate stress (55%) and severe stress (40%), in according with field capacity and three acidity treatments: no stress (55%), moderate stress (33%) and severe stress (23%), considering the base saturation. The experimental design was that of random blocks under factorial scheme of 3x3, with four replicates. After 60 days under the stress association, the levels of free proline, the nitrate reductase activity and the growth of the sugarcane roots system were evaluated in seedlings of sugarcane. The nitrate reductase enzyme activity can be considered a physiological indicator of the effect of the association of acid and water stress in moderate conditions in soil, while the free proline can be considered physiological indicator to both stress in severe conditions. Water deficiency increasing reduced growth of sugarcane roots. O objetivo deste trabalho foi avaliar indicadores fisiológicos da associa o entre deficiência hídrica e acidez do solo, por meio da determina o da atividade da enzima redutase do nitrato, dos teores de prolina livre e do crescimento inicial do sistema radicular de plantas jovens da cultivar IAC91-5155 de cana-de-a úcar. Aos 30 dias, as mudas, originadas da brota o de uma gema, foram transferidas para vasos de plástico de 12 dm3 contendo Latossolo Vermelho distrófico álico e submetidas à associa o de três tratamentos de disponibilidade hídrica: sem estresse (70%), estresse moderado (55%) e estresse severo (40%), de acordo com a capacidade de campo, e três níveis de acidez no solo: sem estresse (55%), estresse moderado (33%) e estresse severo (23%), considerando-se o índice de satura o por bases. O delineamento experimental utilizado foi em blocos casualizados, em esquema fatorial 3x3, com quatro repeti es. Aos 60 dias sob associa o dos estresses foram determinados a atividade da enzima redutase do nitrato, os teores de prolina livre e o crescimento inicial do sistema radicular de plantas jovens de cana-de-a úcar. A atividade da enzima redutase do nitrato é indicadora fisiológica do efeito da associa o do estresse hídrico e da acidez em condi es moderadas n
Simultaneous effect of water deficiency and aluminum toxicity in the soil in cultivar IAC91-5155 of sugarcane Efeito simultaneo da deficiência hídrica e do alumínio tóxico no solo na cultivar IAC91-5155 de cana-de-a úcar
Samira Domingues Carlin,Andressa Freitas de Lima Rhein,Durvalina Maria Mathias dos Santos
Semina : Ciências Agrárias , 2012,
Abstract: Sugarcane is a very important economic crop in Brazil. The effects of abiotic stresses cause negative reduction of the productivity in the sugarcane industry. In order to identify indicators of stresses tolerance, two physiological variables were evaluated, nitrate reductase activity and chlorophyll contents in young plants of sugarcane, cv. IAC91-5155. The simultaneous effect of abiotic stresses of high occurrence in Brazilian soils are, water deficiency and aluminum toxicity. The plants were submitted to three treatments of water availability (% field capacity, FC): no stress (70% FC), moderate stress (55% FC), and extreme stress (40% FC); and three acidity treatments in the soil (base saturation, V%): no acidity (V=55%), average acidity (V=33%), and high acidity (V=23%). The experiment was carried out in greenhouse, with 29.7±4.3oC and 75±10% RH. The experimental design was in randomized blocks, in 3×3 factorial arrangement, with four replicates. After 60 days, nitrate reductase activity and chlorophyll contents were evaluated in the diagnostic leaf. The results demonstrate that the response of plants to a combination of drought and aluminum toxicity, similar to the conditions in many natural environments, is different from the response of plants to each of these stresses applied individually, as typically tested in the laboratory. The nitrate reductase activity can be used as a biochemical-physiological marker of water deficiency while chlorophyll contents can be used as a biochemical-physiological marker of both of them, water deficiency or aluminum toxicity in soil. Both parameters can not be as a biochemical-physiological marker for acclimation of young plants of sugarcane cv. IAC91-5155, under the combined stresses. Na cana-de-a úcar, cultura de grande importancia econ mica no Brasil, os efeitos dos estresses abióticos causam acentuada redu o da produtividade inferindo negativamente na agroindústria canavieira. Em busca de encontrar parametros que atuem como indicadores fisiológicos da aclimata o das plantas aos efeitos da combina o de estresses, o presente trabalho avaliou a atividade da redutase do nitrato e os teores de clorofilas em plantas jovens de cana-de-a úcar, cv. IAC91-5155, sob efeito simultaneo de dois estresses abióticos de grande ocorrência nos solos brasileiros: deficiência hídrica e alumínio tóxico. Para tanto, as plantas foram submetidas a três tratamentos de disponibilidade hídrica (% de capacidade de campo, CC): sem estresse (70% CC), estresse moderado (55% CC) e estresse severo (40% CC) e três tratamentos de acidez no solo
Espermidina exógena atenua os efeitos do NaCl na germina o e crescimento inicial de leguminosas forrageiras Exogenous spermidine alleviates the effects of NaCl on the germination and initial growth of forage legumes
Maria Letícia Guindalini Melloni,Flávio José Rodrigues Cruz,Durvalina Maria Mathias dos Santos,Luiz Felipe Gevenez de Souza
Revista Brasileira de Sementes , 2012, DOI: 10.1590/s0101-31222012000300018
Abstract: Objetivou-se nesse estudo avaliar o papel atenuador da espermidina exógena sobre a germina o, vigor de sementes e crescimento de plantulas de cultivares das forrageiras alfafa, guandu e labe-labe submetidas ao estresse salino. A semeadura foi realizada em caixas de plástico tipo "gerbox" forradas com papel de filtro umedecidos com solu es salinas nas concentra es de 0, 20, 40, 60, 80 e 120 mM de NaCl contendo 0 ou 0,5 mM de espermidina. O delineamento experimental foi inteiramente casualizado em esquema fatorial 3 x 6 x 2 (forrageiras x salinidade x espermidina) com cinco repeti es de 25 sementes. As avalia es da germina o foram realizadas no quarto e décimo dias, juntamente com o índice de velocidade de germina o (IVG), avaliado até o nono dia após a semeadura. Determinou-se a concentra o salina que reduz em 50% a germina o e a massa seca da parte aérea e raiz no décimo dia após a semeadura. A aplica o de espermidina exógena proporcionou maior acúmulo de massa seca das raízes de labe-labe cv. Rongai, além de ter possibilitado a germina o de 50% das sementes de guandu cv. Caqui até a concentra o salina de 72,09 mM de NaCl, assim como maior IVG nas sementes das leguminosas alfafa cv. Crioula e labe-labe cv. Rongai. The objective of this study was to evaluate the mitigating role of exogenous spermidine on the seed germination, seed vigor and seedling growth of alfalfa forage cultivars, pigeon pea and lablab subjected to salt stress. The seeds were sown in plastic gerboxes lined with filter paper moistened with saline solutions at concentrations of 0, 20, 40, 60, 80 and 120 mM NaCl containing 0 or 0.5 mM spermidine. The experimental design was a completely randomized factorial 3 x 6 x 2 (forage x salinity x spermidine) with five replicates of 25 seeds. Germination was evaluated on the fourth and tenth days, along with the germination speed index, measured until the ninth day after sowing. The salt concentration had reduced germination and the dry weight of shoot and root by 50% on the tenth day after sowing. The application of exogenous spermidine resulted in a greater dry root weight of lablab cv. Rongai, 50% germination of pigeon pea seeds cv. Caqui at the salt concentration of 72.09 mM NaCl, and a higher GSI for alfalfa cv. Crioula and lablab cv. Rongai seeds.
Estresse salino associado à aplica??o exógena de espermidina no acúmulo de glicina betaína em Guandu
Destro, Moacir Vinícius Pereira;Santos, Durvalina Maria Mathias dos;Vollet, Vanessa Cristiane;Marin, Ad?o;Banzatto, David Ariovaldo;
Bragantia , 2008, DOI: 10.1590/S0006-87052008000300006
Abstract: this study was undertaken to evaluate the effect of salt stress associated to exogenous spermidine (spd) application on the accumulation of glycine betaine in the pigeonpea genotypes iac fava larga and caqui. the use of this compatible osmolyte as a biochemical-physiological indicator of salinity was also evaluated. the experiment was carried out at unesp, faculdade de ciências agrárias e veterinárias, in jaboticabal (sp), from october to november 2005, in a grow room with irradiance of 190 μmol m-2 s-1, photoperiod of 12 hours, temperature set to 25 oc and the rh to 40%. seeds were sowed in sterile sand with adequate water supply. after 10 days, seedlings were transferred to nutritive solution during 20 days for acclimation. the experiment was then arranged in randomized block design in a 2 x 2 x 4 factorial, corresponding to the genotypes (iac fava larga and caqui), spd rates (control and 0.5 mm) and salt stress (0, 20, 60 and 80 mm nacl). the levels of glycine betaine were determined after 20 days under stress. our results show that glycine betaine can be used as a biochemical-physiological marker of salt stress in the 'iac fava larga'.
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