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Tunes,Lilian Madruga de; Avelar,Suemar Alexandre Gonçalves; Barros,Antonio Carlos Souza Albuquerque; Pedroso,Daniele Cardoso; Muniz,Marlove Fátima Brião; Menezes,Nilson Lemos de. |
The objective of this study was to determine the responses of the wheat cultivars CD 108 and CD 111 for tolerance to organic acids. The effects of five concentrations of the three main acids formed in the soil were studied: acetic acid (0, 4, 8, 12 and 16 mM), propionic acid (0, 4, 8, 12 and 16 mM) and butyric acid (0, 2, 4, 8 and 12 mM). Tests included germination, shoot length, root length and dry weight of shoot and root. The variable root length is the most responsive variable for all the acids tested and the critical level of toxicity of acetic, propionic and butyric acids, which reduced root length by at least 50% was 9.0, 8.5 and 4.0 mM respectively. It was concluded that the presence of acetic, propionic and butyric acids in the germination... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum L.; Anaerobic decomposition; Toxicity; Physiological potential. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222012000300002 |
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Nunes,Maíra F; Cunha-Santino,Marcela B. da; Bianchini Jr,Irineu. |
Enzymatic activity during decomposition is extremely important to hydrolyze molecules that are assimilated by microorganisms. During aquatic macrophytes decomposition, enzymes act mainly in the breakdown of lignocellulolytic matrix fibers (i.e. cellulose, hemicellulose and lignin) that encompass the refractory fraction from organic matter. Considering the importance of enzymatic activities role in decomposition processes, this study aimed to describe the temporal changes of xylanase and cellulose activities during anaerobic decomposition of Ricciocarpus natans (freely-floating), Oxycaryum cubense (emergent) and Cabomba furcata (submersed). The aquatic macrophytes were collected in Óleo Lagoon, Luiz Antonio, São Paulo, Brazil and bioassays were... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anaerobic decomposition; Aquatic macrophytes; Xylanase; Cellulase. |
Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100010 |
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