Abstract
Peats are an important reserve of humified carbon in terrestrial ecosystems. The interest in the use of humic substances as plant growth promoters is continuously increasing. The objective of this study was to evaluate the bioactivity of alkaline soluble humic substances (HS), humic (HA) and fulvic acids (FA) isolated from peats with different decomposition stages of organic matter (sapric, fibric and hemic) in the Serra do Espinhaço Meridional, state of Minas Gerais. Dose-response curves were established for the number of lateral roots growing from the main plant axis of tomato seedlings. The bioactivity of HA was greatest (highest response in lateral roots at lowest concentration) while FA did not intensify root growth. Both HS and HA stimulated root hair formation. At low concentrations, HS and HA induced root hair formation near the root cap, a typical hormonal imbalance effect in plants. Transgenic tomato with reporter gene DR5::GUS allowed the observation that the auxin-related signalling pathway was involved in root growth promotion by HA.
Highlights
A determinação dos teores de C oxidável nas turfas e nas frações humificadas foi realizada após a reação com K2Cr2O7 0,0866 mol L-1 com fornecimento de calor externo seguido da titulação com Fe(NH4)2(SO4)2 6H2O 0,2 mol L-1
Após a germinação (4–5 dias), as plântulas foram tratadas com os materiais húmicos (SH, AH e AF) em diferentes concentrações: 0; 12,5; 25,0; 50,0; 100,0; 150,0; 200,0; 275,0 e 400,0 mg L-1
& GERZABEK, M.H. Increased soil organic carbon sequestration through hydrophobic protection by humic substances
Summary
Alexandre Christofaro Silva(2), Luciano Pasqualoto Canellas(3), Fábio Lopes Olivares(3), Leonardo Barros Dobbss(4), Natalia. O objetivo deste trabalho foi avaliar a bioatividade das substâncias húmicas alcalino solúveis (SH), ácidos húmicos (AH) e fúlvicos (AF) isolados de turfeiras com matéria orgânica em diferentes estádios de decomposição da matéria orgânica (sáprica, hêmica ou fíbrica) localizadas na Serra do Espinhaço Meridional, MG. O uso do tomateiro transgênico com gene repórter DR5::GUS permitiu a observação da indução de rotas de sinalização ligadas à ação das auxinas na promoção do crescimento radicular pelos AH. The bioactivity of HA was greatest (highest response in lateral roots at lowest concentration) while FA did not intensify root growth Both HS and HA stimulated root hair formation. Esse trabalho foi realizado com o objetivo de avaliar o efeito das substâncias húmicas isoladas de uma turfeira da Serra do Espinhaço Meridional sobre a promoção do crescimento radicular de plântulas de tomateiro
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