Work

Humic Acids Isolated from Earthworm Compost Enhance Root Elongation, Lateral Root Emergence, and Plasma Membrane H+-ATPase Activity in Maize Roots

Year: 2002

Type: article

Abstract: Earthworms (Eisenia foetida) produce humic substances that can influence plant growth by mechanisms that are not yet clear. In this work, we investigated the effects of humic acids (HAs) isolated from cattle manure earthworm compost on the earliest stages of lateral root development and on the plasma membrane H(+)-ATPase activity. These HAs enhance the root growth of maize (Zea mays) seedlings in conjunction with a marked proliferation of sites of lateral root emergence. They also stimulate the plasma membrane H(+)-ATPase activity, apparently associated with an ability to promote expression of this enzyme. In addition, structural analysis reveals the presence of exchangeable auxin groups in the macrostructure of the earthworm compost HA. These results may shed light on the hormonal activity that has been postulated for these humic substances.

Source: PLANT PHYSIOLOGY

DOI: 10.1104/pp.007088

Authors: Luciano Pasqualoto Canellas, Fabio Lopes Olivares, Anna L. Okorokova-Façanha, Arnoldo Rocha Façanha

Institution: State University of Norte Fluminense

Language: English

Topic: Plant Growth Enhancement Techniques

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: bronze

Funders: Empresa Brasileira de Pesquisa Agropecuária, Universidade Federal do Rio de Janeiro