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Articles by G.A.R. Alves
Total Records ( 4 ) for G.A.R. Alves
  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 2󫏁, 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.
  R.C.L. Costa , A.K.S. Lobato , C.F. Oliveira Neto , P.S.P. Maia , G.A.R. Alves and H.D. Laughinghouse
  The aim of this study was to evaluate and compare the effects of water stress on biochemical and physiological parameters of Vigna unguiculata (L.) Walp. (Sempre verde and Pitiuba), as well as reveal the cultivar that better adapts under water stress. The experimental design was randomized entirely in factorial, with 2 cultivars (Sempre verde and Pitiuba), combined with 2 water conditions (stress and control). Tenors of proline, free amino acids, total soluble carbohydrates and total soluble proteins were quantified and the nitrate reductase activity was measured. The plants submitted to stress suffered an increase in the amounts of proline, since this solute is an osmotic adjuster. There was an increase in the amounts of amino acids due to an increase in the protease enzyme activity and an increase in the total carbohydrate levels, caused by the increase of starch. A decrease in the amounts of total protein caused by the decrease in their synthesis and a fall in nitrate reduction activity caused by the low nitrate influx were reported. These responses were seen in both cultivars. The Pitiuba cultivar presented responses that show better osmotic adjustment in these conditions, revealing a greater adaptability of this cultivar in conditions of hydric stress.
  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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