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| Pereira,Bruno Fernando Faria; Rozane,Danilo Eduardo; Araújo,Suzana Romeiro; Barth,Gabriel; Queiroz,Rafaela Josemara Barbosa; Nogueira,Thiago Assis Rodrigues; Moraes,Milton Ferreira; Cabral,Cleusa Pereira; Boaretto,Antonio Enedi; Malavolta,Eurípedes. |
| Among the toxic elements, Cd has received considerable attention in view of its association with a number of human health problems. The objectives of this study were to evaluate the Cd availability and accumulation in soil, transfer rate and toxicity in lettuce and rice plants grown in a Cd-contaminated Typic Hapludox. Two simultaneous greenhouse experiments with lettuce and rice test plants were conducted in a randomized complete block design with four replications. The treatments consisted of four Cd rates (CdCl2), 0.0; 1.3; 3.0 and 6.0 mg kg-1, based on the guidelines recommended by the Environmental Agency of the State of São Paulo, Brazil (Cetesb). Higher Cd rates increased extractable Cd (using Mehlich-3, Mehlich-1 and DTPA chemical extractants) and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa L.; Oryza sativa L.; Soil pollution; Chemical extractants; Heavy metals; Human health. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000200033 |
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| Lavres Junior,José; Malavolta,Eurípedes; Nogueira,Neusa de Lima; Moraes,Milton Ferreira; Reis,André Rodrigues; Rossi,Mônica Lanzoni; Cabral,Cleusa Pereira. |
| The deleterious effects of both Mn deficiency and excess on the development of plants have been evaluated with regard to aspects of shoot anatomy, ultrastructure and biochemistry, focusing mainly on the manifestation of visual symptoms. However, there is little information in the literature on changes in the root system in response to Mn supply. The objective of this study was to evaluate the effects of Mn doses (0.5, 2.0 and 200.0 μmol L-1) in a nutrient solution on the anatomy of leaves and roots of the Glycine max (L.) cultivars Santa Rosa, IAC-15 and IAC-Foscarin 31. Visual deficiency symptoms were first observed in Santa Rosa and IAC-15, which were also the only cultivars where Mn-toxicity symptoms were observed. Only in IAC-15, a high Mn supply led... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apoplast; Glycine max; Optical microscopy; Root diameter. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000200017 |
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| Lavres Junior,José; Moraes,Milton Ferreira; Cabral,Cleusa Pereira; Malavolta,Eurípedes. |
| A toxidez de Mn pode ser um problema comum nas regiões tropicais com predominância de solos ácidos. Entretanto, variações das concentrações desse nutriente nas plantas têm sido atribuídas também a diferenças inter e intra-específicas. O presente estudo foi desenvolvido em casa de vegetação e teve como objetivo avaliar as causas de tolerância diferencial à toxidez de Mn. Os cultivares de soja [Glycine max (L.) Merrill] Santa Rosa, IAC-15 e IAC-Foscarin 31 foram cultivados em solução nutritiva (pH 5,0) com cinco doses de Mn (2, 100, 150, 200 e 250 µmol L-1). O delineamento experimental foi o de blocos completos ao acaso em esquema fatorial 5 x 3 (cinco doses de Mn e três cultivares), com três repetições. Os cultivares IAC-15 e Santa Rosa exibiram sintomas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apoplasto; Comprimento total de raízes; Simplasto. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000100017 |
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| Reis,Andre Rodrigues; Favarin,José Laércio; Gallo,Luiz Antônio; Malavolta,Eurípedes; Moraes,Milton Ferreira; Lavres Junior,José. |
| Nitrate reductase is the first enzyme in the pathway of nitrate reduction by plants, followed by glutamine synthetase, which incorporates ammonia to glutamine. The purpose of this study was to evaluate the nitrate reductase and glutamine synthetase activity, total soluble protein content, N and Ni content in coffee leaves during fruit development under field conditions to establish new informations to help assess the N nutritional status and fertilizer management. The experimental design was in randomized complete blocks, arranged in a 3 x 6 factorial design, with five replications. The treatments consisted of 3 N rates (0 - control, 150 and 300 kg ha-1) and six evaluation periods (January, February, March, April, May, and June) in six-year-old coffee... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Nitrogen assimilating enzymes; Nitrogen fertilizer. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000200009 |
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