Root growth promotion by humic acids from composted and non-composted urban organic wastes

被引:155
作者
Jindo, Keiji [1 ]
Martim, Silvia Aparecida [2 ]
Navarro, Elena Cantero [3 ]
Perez-Alfocea, Francisco [3 ]
Hernandez, Teresa [1 ]
Garcia, Carlos [1 ]
Aguiar, Natalia Oliveira [4 ]
Canellas, Luciano Pasqualoto [4 ]
机构
[1] Ctr Edafol & Biol Aplicada Segura CEBAS CSIC, Dept Soil & Water Conservat & Organ Waste Managem, Murcia 30100, Spain
[2] Univ Fed Rural Rio de Janeiro, Dept Ciencias Fisiol, Rio De Janeiro, Brazil
[3] Ctr Edafol & Biol Aplicada Segura CEBAS CSIC, Dept Plant Nutr, Murcia 30100, Spain
[4] Univ Estadual Norte Fluminense Darcy Ribeiro UENF, Nucleo Desenvolvimento Insumos Biol Agr NUDIBA, BR-28602013 Campos Dos Goytacazes, Brazil
关键词
Humic acids; Auxin-like; Sewage sludge; Municipal solid wastes; Composting; MEMBRANE H+-ATPASE; PLANT-GROWTH; CHEMICAL CHARACTERISTICS; MINERAL-NUTRITION; NUTRIENT CONTENT; SUBSTANCES; AUXIN; MATTER; FRACTIONS; TRANSPORT;
D O I
10.1007/s11104-011-1024-3
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Background and aims Besides general effect of organic residues on soil quality and plant crop, hormonal direct effect on plant growth by extracted humic acids of organic materials is interesting and profitable theme. In the present work, we studied on direct interaction between humic acid and root growth, depending on different origin of organic materials. Methods All extracted humic acids of four organic materials (sewage sludge, compost sewage sludge, municipal solid waste, compost municipal solid waste) were characterized chemically by elemental analyses, ion pair chromatography (ICP), size exclusion chromatography (HPSEC), solid-state nuclear magnetic resonance (C-13-CPMAS-NMR) and quantification of IAA. Later, different morphological effects on maize (principal root growth, lateral root growth, root area, root mitosic site, root dry weight and H+-ATPase activity of plasma membrane) were analyzed. Results All humic acids samples promoted root growth and proton pump activity in maize vesicles, especially those composted samples, which contained more carboxylic groups and had a more hydrophobic character, produced preferentially morphological and biochemical effects. Conclusion The conformational dynamics of humic hydrophobic associations in the rhizosphere may release auxin-like plant growth promoters and enhance plant biochemical activities. These organic wastes represent a renewable source of humic acid for use as plant root promoter.
引用
收藏
页码:209 / 220
页数:12
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