Humic acids induce a eustress state via photosynthesis and nitrogen metabolism leading to a root growth improvement in rice plants

Castro, Tadeu Augusto van Tol de; Berbara, Ricardo Luís Louro; Tavares, Orlando Carlos Huertas; Mello, Débora Fernandes da Graça; Pereira, Erinaldo Gomes; Souza, Camila da Costa Barros de; Espinosa, Luis Maqueira; García, Andrés Calderín

doi:10.1016/j.plaphy.2021.02.043

Cited by 88 publications

(33 citation statements)

References 52 publications

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“…Plants respond to abiotic stresses through both physiological and morphological responses ( Yadav et al, 2020 ). Many of these same responses, for example, physiological responses like increases in [Ca 2+ ] cyt ( Ramos et al, 2015 ), increased production of antioxidants ( Moghadam et al, 2014 ; Hemida et al, 2017 ), and morphological changes to root system architecture ( Canellas et al, 2008 , 2009 , 2010 ; Bobik et al, 2010 ; Canellas et al, 2012 ; Aguiar et al, 2009 , 2013 ; Dobbss et al, 2010 ; Muscolo et al, 2010 ; David et al, 2014 ; Garcia et al, 2016 ; van Tol de Castro et al, 2021 ) have also been observed in plants treated with HS. Plants exposed to abiotic stress typically develop recognizable morphological changes, called stress-induced morphogenesis responses (SIMS), to root systems that include re-differentiation of the pericycle and formation of lateral roots, inhibition of root cell elongation, formation of root hairs in the apex, and blocked cell division in the primary meristem ( Patakas, 2011 ).…”

Section: Discussionmentioning

confidence: 92%

“…Plants exposed to abiotic stress typically develop recognizable morphological changes, called stress-induced morphogenesis responses (SIMS), to root systems that include re-differentiation of the pericycle and formation of lateral roots, inhibition of root cell elongation, formation of root hairs in the apex, and blocked cell division in the primary meristem ( Patakas, 2011 ). In many reports, application of HA has resulted in increases in numbers of lateral roots, lateral root length, and density ( Aguiar et al, 2009 ; Canellas et al, 2009 , 2010 , 2011 , 2012 ; Dobbss et al, 2010 ; Muscolo et al, 2010 ; Aguiar et al, 2013 ; David et al, 2014 ; Garcia et al, 2016 ; van Tol de Castro et al, 2021 ). However, in some cases, increases in lateral roots have been accompanied by increases in the principal root length ( Aguiar et al, 2009 ; Canellas et al, 2009 ; van Tol de Castro et al, 2021 ), root diameter ( Aguiar et al, 2013 ; Garcia et al, 2016 ), or both ( Canellas et al, 2010 ).…”

Section: Discussionmentioning

confidence: 99%

“…In many reports, application of HA has resulted in increases in numbers of lateral roots, lateral root length, and density ( Aguiar et al, 2009 ; Canellas et al, 2009 , 2010 , 2011 , 2012 ; Dobbss et al, 2010 ; Muscolo et al, 2010 ; Aguiar et al, 2013 ; David et al, 2014 ; Garcia et al, 2016 ; van Tol de Castro et al, 2021 ). However, in some cases, increases in lateral roots have been accompanied by increases in the principal root length ( Aguiar et al, 2009 ; Canellas et al, 2009 ; van Tol de Castro et al, 2021 ), root diameter ( Aguiar et al, 2013 ; Garcia et al, 2016 ), or both ( Canellas et al, 2010 ). Therefore, although in most cases while exposure of plants to HAs does result in increased root system ramification, HAs have also caused increases in primary root length, which does not conform to the typical SIMS.…”

Section: Discussionmentioning

confidence: 99%

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RETRACTED: Use of Ore-Derived Humic Acids With Diverse Chemistries to Elucidate Structure-Activity Relationships (SAR) of Humic Acids in Plant Phenotypic Expression

Lamar¹,

Monda²,

Sleighter³

2021

Front. Plant Sci.

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We report the results of a structure-activity relationship study that was undertaken to identify humic substance chemistries that drive the plant biostimulant response. The effects of seven extensively chemically characterized, ore-derived humic acids (HA) on corn seedling biomass and root and shoot morphological parameters were investigated. Chemometric analyses were then conducted to identify correlations between HA chemical features and plant biomass and morphological characteristics. The primary chemical driver of plant biomass and morphology was the ratio between HA electron accepting capacity (EAC) and electron donating capacity (EDC). The HA electron accepting capacity is found in quinones and semiquinone free radicals, while the HA electron donating capacity is found in polyphenolics and glycosylated polyphenolics. Based on our results, we propose a mechanism of action for ore-derived HA plant biostimulation that involves the interplay of pro-oxidants, in the form of quinones and semiquinone radicals, and antioxidants, in the form of polyphenols and possibly glycones and carbohydrates. The quinones/semiquinones initiate an oxidative stress response via the stimulation of transmembrane electron flow that results in both reactive oxygen species (ROS) production (i.e., an oxidative burst) and membrane depolarization, the latter of which allows Ca2+ flux from the apoplast into the cytoplasm. Based on the magnitude of depolarization, a specific cytoplasmic Ca2+ signature is produced. As a secondary messenger Ca2+, via binding to Ca2+− sensor proteins, transmits the signature signal, resulting in specific intracellular responses that include changes to plant morphology. The greater the EAC, the greater the ROS production and magnitude of plasma membrane depolarization and resulting stress response. The HA antioxidants are able to scavenge and quench the ROS and thus modulate the intensity and extent of the stress response to greater or lesser degrees, based on their concentrations and radical scavenging efficiencies, and thus modify the Ca2+ signature and ultimately the intracellular molecular responses.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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RETRACTED: Use of Ore-Derived Humic Acids With Diverse Chemistries to Elucidate Structure-Activity Relationships (SAR) of Humic Acids in Plant Phenotypic Expression

Lamar¹,

Monda²,

Sleighter³

2021

Front. Plant Sci.

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“…The following regression equations for coded values (eqn (4)) and actual experimental values (eqn ( 5)) were set up by collecting the data from actual experimental conditions (Table 3) according to the Box-Behnken model, which expresses the relationship between the dependent variable Y (the A 450 value) and the independent variables A (HNO 3 concentration), B (temperature), C (coal loading ratio) and D (time). Y ¼ 67.21 + 11.90A + 3.54B À 2.24C + 2.88D + 2.24AB À 0.86AC + 0.89AD À 0.66BC + 0.75BD + 1.10CD À 20.11A 2 À 6.46B 2 À 7.94C 2 À 4.58D 2 (4)…”

Section: Ha Concentration Optimization By Rsmmentioning

confidence: 99%

“…1 As a fertilizer additive and soil remediation agent, HAs play an important role in stimulating plant growth, enhancing soil fertility and decreasing the toxicity of heavy metals. [2][3][4] Accordingly, the potential biochemical activity and preparation method of HAs have aroused extensive attention.…”

Section: Introductionmentioning

confidence: 99%

Extraction optimization and quality evaluation of humic acids from lignite using the cell-free filtrate of Penicillium ortum MJ51

Tan

Wang

et al. 2022

RSC Adv.

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Does humic acid foliar application affect growth and nutrient status of water‐stressed maize?

Pitann,

Khan,

Mühling

2024

Plant Enviro Interactions

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Maize (Zea mays L.) is one of the world's most important crops, but its productivity is at high risk as climate change increases the risk of water stress. Therefore, the development of mitigation strategies to combat water stress in agriculture is fundamental to ensure food security. Humic acids are known to have a positive effect on drought tolerance, but data on their efficacy under waterlogging are lacking. This study aimed to elucidate the effect of a new humic acid product, a by‐product of Ukrainian bentonite mining, on maize growth and nutrient status under waterlogging. Maize was grown for 9 weeks and three water stress treatments, which were applied for 14 days: waterlogging, alternating waterlogging and drought, and drought. On the day of stress application, the humic acid product (1% v/v) was applied to the leaves. Soil Plant Analysis Development (SPAD) values were recorded during the stress treatments. Plants were harvested after stressing ceased and fresh weight and P and Zn status were analyzed. Drought reduced shoot fresh weight, while it was unaffected under waterlogging. This is in contrast to SPAD readings, which showed a significant decrease over time under submergence, but not under drought. Under alternating stress, although SPAD values declined under waterlogging but stabilized when switched to drought, no growth reduction was apparent. Application of the humic acid product was ineffective in all cases. Although anthocyanin discoloration occurred under waterlogging stress, P deficiency, which is usually the main factor driving anthocyanin formation, was not the reason. Interestingly, Zn concentration decreased under waterlogging but not under the other stresses, which was alleviated by humic acid application. However, no effect of foliar‐applied humic acids was observed under alternating and drought stress. It can be concluded that the tested humic acid product has the potential to improve the Zn status of maize under waterlogging.

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Humic acids induce a eustress state via photosynthesis and nitrogen metabolism leading to a root growth improvement in rice plants

Cited by 88 publications

References 52 publications

RETRACTED: Use of Ore-Derived Humic Acids With Diverse Chemistries to Elucidate Structure-Activity Relationships (SAR) of Humic Acids in Plant Phenotypic Expression

RETRACTED: Use of Ore-Derived Humic Acids With Diverse Chemistries to Elucidate Structure-Activity Relationships (SAR) of Humic Acids in Plant Phenotypic Expression

Extraction optimization and quality evaluation of humic acids from lignite using the cell-free filtrate of Penicillium ortum MJ51

Does humic acid foliar application affect growth and nutrient status of water‐stressed maize?

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