Humic Acids Isolated from Earthworm Compost Enhance Root Elongation, Lateral Root Emergence, and Plasma Membrane H+-ATPase Activity in Maize Roots
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Open Access
- 1 December 2002
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 130 (4), 1951-1957
- https://doi.org/10.1104/pp.007088
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.This publication has 40 references indexed in Scilit:
- Hormone‐like activity of humic substances in Fagus sylvaticae forestsNew Phytologist, 2001
- SIZES AND SHAPES OF HUMIC SUBSTANCESSoil Science, 1999
- Plasma membrane H+‐ATPase in the root apex: Evidence for strong expression in xylem parenchyma and asymmetric localization within cortical and epidermal cellsPhysiologia Plantarum, 1998
- A major isoform of the maize plasma membrane H(+)-ATPase: characterization and induction by auxin in coleoptiles.THE PLANT CELL ONLINE, 1996
- Three-dimensional models for humic acids and soil organic matterThe Science of Nature, 1995
- Nitrate uptake and ATPase activity in oat seedlings in the presence of two humic fractionsSoil Biology and Biochemistry, 1991
- H+-Pumping Driven by the Vanadate-Sensitive ATPase in Membrane Vesicles from Corn RootsPlant Physiology, 1986
- H+-Translocating ATPases: Advances Using Membrane VesiclesAnnual Review of Plant Physiology, 1985
- Experimental Studies on Lateral Root Formation in Radish Seedling Roots. I. General Methods, Developmental Stages, and Spontaneous Formation of LateralsBotanical Gazette, 1982
- Some effects of organic growth-promoting substances (auximones) on the growth of Lemna minor in mineral culture solutionsProceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character, 1917