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Article

The Singular Molecular Conformation of Humic Acids in Solution Influences Their Ability to Enhance Root Hydraulic Conductivity and Plant Growth

1
Department of Environmental Biology, BIOMA Institut, Sciences School, University of Navarra, 31007 Pamplona, Spain
2
Plant Physiology and Plant-Microorganism Interaction Laboratory, Universidad Nacional de Río Cuarto, Córdoba 5800, Argentina
*
Authors to whom correspondence should be addressed.
Academic Editors: Riccardo Spaccini and Claus Jacob
Molecules 2021, 26(1), 3; https://doi.org/10.3390/molecules26010003
Received: 16 November 2020 / Revised: 9 December 2020 / Accepted: 19 December 2020 / Published: 22 December 2020
Some studies have reported that the capacity of humic substances to improve plant growth is dependent on their ability to increase root hydraulic conductivity. It was proposed that this effect is directly related to the structural conformation in solution of these substances. To study this hypothesis, the effects on root hydraulic conductivity and growth of cucumber plants of a sedimentary humic acid and two polymers—polyacrylic acid and polyethylene glycol—presenting a molecular conformation in water solution different from that of the humic acid have been studied. The results show that whereas the humic acid caused an increase in root hydraulic conductivity and plant growth, both the polyacrylic acid and the polyethylene glycol did not modify plant growth and caused a decrease in root hydraulic conductivity. These results can be explained by the different molecular conformation in water solution of the three molecular systems. The relationships between these biological effects and the molecular conformation of the three molecular systems in water solution are discussed. View Full-Text
Keywords: biomolecules; humic substances; polyacrylic acid; polyethylene glycol; plant growth improvement; molecular conformation biomolecules; humic substances; polyacrylic acid; polyethylene glycol; plant growth improvement; molecular conformation
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MDPI and ACS Style

Olaetxea, M.; Mora, V.; Baigorri, R.; Zamarreño, A.M.; García-Mina, J.M. The Singular Molecular Conformation of Humic Acids in Solution Influences Their Ability to Enhance Root Hydraulic Conductivity and Plant Growth. Molecules 2021, 26, 3. https://doi.org/10.3390/molecules26010003

AMA Style

Olaetxea M, Mora V, Baigorri R, Zamarreño AM, García-Mina JM. The Singular Molecular Conformation of Humic Acids in Solution Influences Their Ability to Enhance Root Hydraulic Conductivity and Plant Growth. Molecules. 2021; 26(1):3. https://doi.org/10.3390/molecules26010003

Chicago/Turabian Style

Olaetxea, Maite, Veronica Mora, Roberto Baigorri, Angel M. Zamarreño, and Jose M. García-Mina 2021. "The Singular Molecular Conformation of Humic Acids in Solution Influences Their Ability to Enhance Root Hydraulic Conductivity and Plant Growth" Molecules 26, no. 1: 3. https://doi.org/10.3390/molecules26010003

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