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Articles by A.K.S. Lobato
Total Records ( 8 ) for A.K.S. Lobato
  A.K.S. Lobato , C.F. Oliveira Neto , R.C.L. Costa , B.G. Santos Filho , F.K.S. Silva , F.J.R. Cruz , A.C.S. Abboud and H.D. Laughinghouse
  The study had the aim to evaluate the germination responses provoked by water restriction and by the effect of temperature on seeds of S. bicolor cultivar BR-700. The experimental design was to carried out in 38 factorial scheme, with 3 temperature levels (26, 30 and 34C), combined with 8 osmotic potential levels that simulate water restriction ( s = 0.0, -0.1, -0.2, -0.3, -0.4, -0.5, -0.6 and -0.7 MPa). The analyzed variables were the germination percentage (%G) and the mean germination time (MGT). It was showed progressive fall in %G due to the decreased s of the environment, independent of the temperature, caused by the low water conductivity and slow water absorption by the seed. MGT reduced occasioned by temperature increased, in the interval between 26-34C, provoked by an acceleration of biochemical reactions involved in germination. Moreover, the water restriction, as well as the s reduced, proportioned a maximization of MGT.
  A.K.S. Lobato , B.G. Santos Filho , R.C.L. Costa , C.F. Oliveira Neto , A.C.S. Meirelles , F.J.R. Cruz , G. A. R. Alves , H.K.B. Neves , J.D. Pita , M.J.S. Lopes , J.M.N. Freitas , B.S. Monteiro and R. Ferreira Ramos
  The experiment had the aim to investigate and evaluate the responses provoked by the progressive water deficit on leaf relative water content, plant dry matter, free proline, total soluble carbohydrate, sucrose and reducing carbohydrates levels in Glycine max (L.) Merril plants cultivar sambaiba. The experimental design was at randomized entirely factorial, with 2 hydric conditions (stress and control) and 4 stress points (0, 2, 4 and 6 days). It was showed in plants under water deficit the decrease of the leaf relative water content and plant dry matter, however, occurred increase in the total soluble carbohydrates, sucrose and reducing carbohydrates at 33.7, 205.0 and 19.2%, respectively, besides accumulation of free proline at 67.2% as biochemical mechanism of plant osmotic adjustment. It were showed changes on leaf relative water content, total soluble carbohydrates, sucrose and reducing carbohydrates in only 2 days under water stress, besides plant dry matter and proline after the 4th day of water restriction, proving the sensitive high of this species in conditions of water deficiency.
  G.A.R. Alves , A.K.S. Lobato , B.G. Santos Filho , C.F. Oliveira Neto , R.C.L. Da Costa , W.J.M.S. Maia , J.M.N. Freitas and L.I. Silva
  The study aimed at evaluating the in vitro influence of organic matter on the development of the pathogen F. subglutinans F. sp. ananas in soil, as well as analyzing which the possible mechanism involved in this interaction. The experimental design was entirely randomized in scheme factorial 225, with 2 soil levels (normal and sterile), 2 organic matter (with and without organic matter) and 5 times (0, 5, 10, 15 and 20 days), in which were used 10 repetitions. The natural soil without organic matter had reduction in the colony numbers, whereas the sterile soil with organic matter presents strong increase in the colony numbers of the pathogen, in which it had 387.8 and 1135.7 colonies in the 0 and 20th day after the incubation, respectively. The results proved that the organic matter influenced significantly the survival of the F. subglutinans F. sp. ananas, as well as the pathogen survival was strongly maximized by the interaction of the sterile soil and organic matter.
  M.H.L. Silva , R.C.L. Costa , A.K.S. Lobato , C.F. Oliveira Neto and H.D. Laughinghouse IV
  This study aimed to evaluate Piper aduncum L. seed germination restricted of water, simulated by solutions prepared with polyethylene glycol (PEG 6000) and thermal action influence, using germination chambers with temperatures controlled from 24 to 30°C. The experimental design was carried out in a 3x5 factorial scheme which counted three temperatures (24, 27 and 30°C), combined with five osmotic potential levels (0.0, -0.1, -0.2, -0.3 and -0.4 MPa). The analyzed variables were germination percentage and mean germination time. The results revealed that as the water restriction rose there was a decrease in the germination percentage and an increase in the mean germination time, demonstrating that seeds of this species are extremely sensitive to water shortage. The temperature increase from 24 to 30°C, accelerated germination.
  A.K.S. Lobato , A.C.S. Meirelles , B.G. Santos Filho , R.C.L. Costa , C.F. Oliveira Neto , F.J.R. Cruz , J.M.N. Freitas , E.M.S. Guedes , A.G. T. Barreto , A.S. Ferreira , B.S. Monteiro , H.K.B. Neves and M.J.S. Lopes
  The experiment had the aim of investigate the responses provoked by the progressive water deficit and evaluate as the rehydration can to contribute to the recovery of the leaf relative water content, plant water content, nitrate reductase enzyme activity, as well as changes in the nitrogen compounds as free ammonium, total soluble amino acids and total soluble proteins in Glycine max (L.) Merril cultivar Sambaiba. The experimental design was at randomized entirely factorial, with 2 water conditions (control and stress/ rehydration) and 5 evaluation points (0, 2, 4, 6th day under stress and 7th day under rehydration). The nitrate reductase activity had accumulated reduction of 70% after 6 days of water deficit and the rehydration promoted increase of 96% in this parameter. The total soluble proteins were reduced at 20.7% in the 6th day of water restriction and after the rehydration were showed increase of 43% in this variable. The results showed with this cultivar submitted the water restriction reveal that occurr significant reductions in the leaf relative water content, plant water content, nitrate reductase enzyme activity, free ammonium and total soluble proteins, however, was showed increase in the free amino acids levels. The leaf relative water content, nitrate reductase enzyme activity and total soluble proteins were recovery after the rehydration.
  A.K.S. Lobato , M.C. Goncalves-Vidigal , P.S. Vidigal Filho , R.C.L. Costa , M.J.S. Lopes , A.S. Cruz , A.C.S. Meirelles and A.M.O. Goncalves
  The aim of this study was to investigate the responses of the nitrogen compounds in the cultivars México 222 (resistant) and Widusa (susceptible) of Phaseolus vulgaris L. plants inoculated with Colletotrichum lindemuthianum race 23. The experimental design used was entirely randomized in factorial scheme, with 2 cultivars (México 222 and Widusa) and 2 treatments (control and inoculated). The compounds evaluated were free ammonium, amino acids, proline and total soluble proteins. The proline level suffered significant increase only in cultivar Widusa, which the increase showed was at 18.9% in plants under pathogen inoculation, when compared with the control plants. The total soluble proteins level in Mexico 222 had significant increase, with the control and inoculated plants presented 4.77 and 6.60 mg g DM-1, respectively. The results revealed that the Widusa cultivar (susceptible) suffered significant changes in free ammonium, total soluble amino acids and proline, however the total soluble proteins level was kept stable. The Mexico 222 cultivar (resistant) presented not significant modification only in proline level. In addition, this study proved the strong influence of the Colletotrichum lindemuthianum pathogen on the nitrogen metabolism of Phaseolus vulgaris plants.
  A.K.S. Lobato , R.C.L. Costa , M.A.M. Neto , C.F. Oliveira Neto , B.G. Santos Filho , G.A.R. Alves , J.M.N. Freitas , F.J.R. Cruz , C.A. Marochio and G.K. Coimbra
  The aim of this study was to evaluate the changes provoked by the water deficit on photosynthetic pigments and carbon metabolism in 2 Vigna unguiculata cultivars, besides indicating, which cultivar is more tolerant under water deficiency. The experimental design used was carried out at entirely randomized in factorial scheme, with 2 cultivars (Pitiuba and Perola) and 2 water regimes (control and stress). The parameters evaluated were leaf relative water content, leaf number, chlorophylls a, b, total and carotenoids, as well as total soluble carbohydrates and sucrose. The decreases of total chlorophylls in Pitiuba and Perola cultivars were at 20.7 and 34.1%, respectively. The total soluble carbohydrates levels in Pitiuba and Perola cultivars presented significant increases at 67.6 and 42.8%, respectively. The study revealed that Pitiuba cultivar presents higher tolerance the water deficiency, because this cultivar had smaller variations in leaf relative water content, leaf number and pigments. In addition, it were showed that total soluble carbohydrates and sucrose suffer changes more intense in Pitiuba, when compared with Perola, in which indicates that the mechanism of osmotic adjustment in Pitiuba is more efficient.
  A.K.S. Lobato , G.K. Coimbra , M.A.M. Neto , R.C.L. Costa , B.G. Santos Filho , C.F. Oliveira Neto , L.M. Luz , A.G.T. Barreto , B.W.F. Pereira , G.A.R. Alves , B.S. Monteiro and C.A. Marochio
  The aim of the study was to investigate the responses promoted by the external application of silicon on water relations and photosynthetic pigments in Capsicum annuum L. plants submitted to water deficiency. The experimental design used was entirely randomized, with 5 treatments (stress, 0.25 μM Si, 1.00 μM Si, 1.75 μM Si and control). The stomatal conductance was significantly influenced by the silicon, in which it were showed the values of 3.4, 16.4, 16.1, 13.7 and 24.3 mmol/m2/sec in stress, 0.25 μM Si, 1.00 μM Si, 1.75 μM Si and control treatments, respectively. The chlorophyll a level in stress, 0.25 μM Si, 1.00 μM Si, 1.75 μM Si and control treatments presented 4.07, 7.29, 8.04, 7.47 and 8.12 mg g-1 FM, respectively. The results indicated that the silicon increased the tolerance to water deficit, in which the leaf relative water content, transpiration, stomatal conductance, chlorophylls a and b, as well as carotenoids were maintenanced in higher levels, if compared with stress plants. In addition, the ratio chlorophylls a/b under the 1.00 μM Si was to improve that control treatment.
 
 
 
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