Structure-Property-Function Relationship in Humic Substances to Explain the Biological Activity in Plants.

Abstract:

:Knowledge of the structure-property-function relationship of humic substances (HSs) is key for understanding their role in soil. Despite progress, studies on this topic are still under discussion. We analyzed 37 humic fractions with respect to their isotopic composition, structural characteristics, and properties responsible for stimulating plant root parameters. We showed that regardless of the source of origin of the carbon (C3 or C4), soil-extracted HSs and humic acids (HAs) are structurally similar to each other. The more labile and functionalized HS fraction is responsible for root emission, whereas the more recalcitrant and less functionalized HA fraction is related to root growth. Labile structures promote root stimulation at lower concentrations, while recalcitrant structures require higher concentrations to promote a similar stimulus. These findings show that lability and recalcitrance, which are derived properties of humic fractions, are related to the type and intensity of their bioactivity. In summary, the comparison of humic fractions allowed a better understanding of the relationship between the source of origin of plant carbon and the structure, properties, and type and intensity of the bioactivity of HSs in plants. In this study, scientific concepts are unified and the basis for the agronomic use of HSs is established.

journal_name

Sci Rep

journal_title

Scientific reports

authors

García AC,de Souza LG,Pereira MG,Castro RN,García-Mina JM,Zonta E,Lisboa FJ,Berbara RL

doi

10.1038/srep20798

subject

Has Abstract

pub_date

2016-02-10 00:00:00

pages

20798

issn

2045-2322

pii

srep20798

journal_volume

6

pub_type

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