Structural Characterization and Bioactivity of Humic and Fulvic Acids Extracted from Preserved and Degraded Brazilian Cerrado Biomes Soils

Araújo, Katharine Vinholte de; Pittarello, Marco; Carletti, Paolo; Campos, Alcinei Ribeiro; Dobbss, Leonardo Barros

doi:10.1134/s1064229322030024

Cited by 8 publications

(5 citation statements)

References 36 publications

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“…This occurs because HA stimulation at the foliar level also triggers signaling and transcriptional responses involving root development such as auxin response factors (ARF) (Elmongy et al, 2020), ABCB polar auxin transporters (Tahiri et al, 2016), calcium-dependent membrane receptors (Canellas et al, 2020), small auxin up-regulated RNA (SAUR) genes , and H + ATPase. This evidence suggests that HA stimulation at the root level is primarily due to auxin-like effects (Elmongy et al, 2020;Araújo et al, 2021). This is consistent with the results obtained in this work (Tab.…”

Section: Humic Acid Bioactivitysupporting

confidence: 93%

“…These bioactivity patterns associated with chemical characteristics of HAs, as well as the origin of the samples, are consistent with previous reports (García et al, 2016a, b;García et al, 2018;García et al, 2019;Araújo et al, 2021). However, it is unlikely that fixed and predictive molecular patterns of bioactivity can be defined; on one hand because the bioactivity mechanisms of HA have not been fully elucidated (García et al, 2019;Nardi et al, 2021); on the other hand, the high variability in the sources of HAs makes it difficult to predict their bioactivity.…”

Section: Humic Acid Bioactivitysupporting

confidence: 88%

“…These HAs did not promote the development of roots by themselves, neither under growth chamber nor in field conditions. Supramolecular analysis indicates that these HAs have a lower content of carboxylic and aromatic groups associated with low auxin-like activity (García et al, 2016a;Araújo et al, 2021). This is consistent with the result of the coleoptile elongation test, in which HAVC bioactivity was only observed at the highest concentrations.…”

Section: Humic Acid Bioactivitysupporting

confidence: 84%

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Biostimulant activity of humic acids derived from goat manure vermicompost and lignite in relation to their structure and interaction with a PGPR strain under semiarid conditions

Valero,

Ustates,

Pantoja-Guerra

2023

Rev. Colomb. Cienc. Hortic

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The use of humified organic matter (HOM)-based plant biostimulants and plant growth-promoting rhizobacteria (PGPR) has emerged as a promising approach to enhance agricultural productivity in arid and semiarid environments. However, the bioactivity of humic stimulants varies based on their chemical composition, and the synergistic effects of co-applying these biostimulants remain to be fully elucidated. In this research, we investigated the structural and bioactive characteristics of humic acids derived from goat manure vermicompost (HAVC) and lignite coal (HAC). Additionally, we explored the plant growth-promoting effects of each humic acid (HA) in conjunction with the Bacillus mycoides strain BSC25 (Bm) on corn plants in arid conditions. To assess the relationship between structure and bioactivity, we determined the supramolecular composition of the HAs and evaluated their effectiveness through a corn coleoptile elongation test. Subsequently, we conducted biostimulation tests on maize seedlings in a growth chamber and performed a field-based biostimulation test in a semi-arid region. Notably, HACs exhibited coleoptile elongation at lower concentrations (25-50 mg LC) compared to HAVCs, which required higher concentrations (100-200 mg LC) to achieve the same effect. These outcomes correlated with the supramolecular composition of HAs. The bioactivity of HACs was linked to their oxygen content, aromatic and carboxylic groups, whereas HAVCs' bioactivity was associated with their carbohydrate, aliphatic carbon, and hydrogen content. The application of both HAs, together with Bm, resulted in enhanced corn leaf biomass production in the growth chamber and under field conditions. This effect can be attributed to the hormone-like actions of HA and the PGPR activity of Bm. Interestingly, despite foliar application, HAs displayed bioactivity at the root level, as evidenced by increased root biomass in the field. These results indicate a PGPR effect of Bm that remained unaltered with co-application of HAVC. However, the joint application of Bm-HAC and Bm-HAVC reversed the positive effect of Bm on corn production under field conditions. This outcome likely relates to the hormone-like effects of HA and potential additive effects following Bm inoculation.

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Section: Humic Acid Bioactivitysupporting

confidence: 93%

Section: Humic Acid Bioactivitysupporting

confidence: 88%

Section: Humic Acid Bioactivitysupporting

confidence: 84%

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Biostimulant activity of humic acids derived from goat manure vermicompost and lignite in relation to their structure and interaction with a PGPR strain under semiarid conditions

Valero,

Ustates,

Pantoja-Guerra

2023

Rev. Colomb. Cienc. Hortic

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“…Los ácidos húmicos y fúlvicos también pueden ser considerados como bioestimulantes, su acción está involucrada en los mecanismos de defensa al estrés abiótico, debido a que genera cambios en algunas enzimas como la catalasa, superóxido dismutasa y ascorbato peroxidasa (Araújo et al, 2022). La acción de estos ácidos orgánicos como bioestimulantes permiten que las plantas absorban de manera más eficiente los nutrientes necesarios para su crecimiento, ya que estos estimulan la toma y traslocación de los elementos e influyen en la expresión de genes involucrados en el transporte de aminoácidos y síntesis de enzimas (Tarafdar, 2022).…”

Section: áCidos Fúlvicosunclassified

“…Estos ácidos, son considerados bioestimulantes, los cuales tienen como principal función mejorar la rizosfera, permitir un uso eficiente de los elementos y generar una mayor disponibilidad de nutrientes para las plantas, esta acción se encuentra asociada a la naturaleza química, estructural y biológica de los ácidos (Baltazar et al, 2021). En el crecimiento de raíces está relacionado con la variación de enzimas del metabolismo y activación de H + -ATPasas a través del aumento de hidrogeniones en la membrana celular, resultando en la expansión celular, por la acidificación de la membrana (Ricci et al, 2019) (Araújo et al, 2022).…”

Section: Introductionunclassified