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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (15): 59-68.doi: 10.11924/j.issn.1000-6850.casb2022-0324

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Humic Substances Involved in Plant Abiotic Stress Response: A Review on the Mechanism

SONG Ge1(), SHI Feng2   

  1. 1 Sino-Russia Institute, Heilongjiang University, Harbin 150080
    2 School of Life Sciences, Heilongjiang University, Harbin 150080
  • Received:2022-04-26 Revised:2022-08-15 Online:2023-05-22 Published:2023-05-22

Abstract:

In order to study the mechanism of humic substances (HS), a natural isomeric polymer organic compound, participating in plant abiotic stress response, this study summarized the following main mechanisms, including the HS mediated regulation of (PM) H+-ATPase, the HS mediated interaction of cell signal molecules, the shielding of HS adsorption layer, the chelation of HS chemical functional groups, and the impacts of HS on plant secondary metabolism and rhizosphere microbial community. It is concluded that HS participates in the regulation of abiotic stress response through a variety of complex defense metabolic mechanisms. Given the complexity of HS biochemistry, as well as many problems in the research of physiological activity and defense metabolism mechanism, future scientific research should mainly focus on the analysis of chemical composition and molecular structure of HS, how HS “colloidal stress” participates in metabolic regulation, the cross interference and feedback regulation mechanism of HS promoting and defense metabolism pathways, and the interaction mechanism between HS and soil microorganisms.

Key words: humic substances, abiotic stress, H+-ATPase, signal molecules, adsorption layer, functional groups, plant secondary metabolism, rhizosphere microbial community