Humic acid modulates growth, photosynthesis, hormone and osmolytes system of maize under drought conditions

Chen, Qi; Qu, Zhaoming; Ma, Guohua; Wang, Wenjing; Dai, Jiaying; Zhang, Min; Wei, Ziqi

doi:10.1016/j.agwat.2021.107447

Cited by 59 publications

(41 citation statements)

References 67 publications

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“…Total carbohydrates can be used as compatible osmolytes by maize [52]. Moreover, for some varieties, the total carbohydrate content can be correlated with a higher tolerance against drought stress [53]. Our results are consistent with such observations-treatments with GB and PG prevented the growth losses caused by drought (Figure 4), in our opinion, by helping to reach the osmotic balance.…”

Section: Discussionsupporting

confidence: 90%

Applying Biostimulants to Combat Water Deficit in Crop Plants: Research and Debate

et al. 2022

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Climate change has increased the severity of drought episodes by further reducing precipitation in vulnerable zones. Drought induces a substantial decrease in agricultural water, reducing crop yields. Consequently, addressing water consumption can increase farmers’ profits. This work describes lab-to-field research in Zea mays, using two biostimulants: glycine betaine (GB) and L-pyroglutamic acid (PG). The biostimulant optimal dosages were selected using a hydroponic system with 20% polyethylene glycol and nursery experiments under water-deficit irrigation. The established dosages were evaluated in field trials in which irrigation was reduced by 20%. Laboratory biostimulant optimisation showed in stressed treated seedlings (GB 0.1 mM; PG 1 mM) an increased dry weight, relative growth rate and water use efficiency, reducing seedling growth loss between 65 and 85%, respectively. Field trials using a GB-optimised dosage showed an increase in plants’ growth, grain yield and flour Ca content. In addition, grain flour carbohydrate content and protein remained similar to control well-watered plants. Finally, the economic aspects of biostimulant treatments, water consumption, water sources (ground vs. desalinated) and grain biomass were addressed. Overall, GB treatment demonstrated to be a valuable tool to reduce water consumption and improve farmers’ earnings.

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Section: Discussionsupporting

confidence: 90%

Applying Biostimulants to Combat Water Deficit in Crop Plants: Research and Debate

et al. 2022

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“…The Mantel test were performed using the vegan library in R to determine correlations between maize yield as well as endogenous hormones and carbon and nitrogen metabolism-related enzyme activities at the Physiological level. The principal component analysis (PCA) was used to investigate determinants on the application of different fertilizations in impacting maize yield and NUE [40]. Figures were plotted using SigmaPlot 2004 (Version 12.0, Systat Software Inc., San Jose, CA, USA).…”

Section: Data Analysesmentioning

confidence: 99%

The Combined Application of Urea and Fulvic Acid Solution Improved Maize Carbon and Nitrogen Metabolism

Gao

et al. 2022

Agronomy

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It has been reported that fulvic acid (FA) application improves soil structure and nutrient availability. However, the effects of combined application of urea (U) and FA solution on the photosynthesis and nitrogen metabolism in maize (Zea mays L.) have rarely been reported. In this study, pot experiments were conducted in 2017 and 2018, and the effects of combined application of urea and FA solution (U+FA) on soil available nutrient contents, maize endogenous hormone concentrations, carbon and nitrogen metabolism-related enzyme concentrations, maize yield, and nitrogen use efficiency (NUE) were researched. Compared with the U treatment, the maize yield and NUE in the U+FA treatment were significantly increased by 8.31% and 17.09 percentage points in 2017 and by 16.90% and 24.31 percentage points in 2018. At the jointing and 12-leaf (V12) stages of maize, soil NH4+ content increased by 139.32% and 12.08%, separately, in the U+FA treatment. At the V12 stage, the auxin, nitrate reductase, nitrite reductase, and glutamine synthetase concentrations in maize root were increased by 42.31%, 74.17%, 16.61%, and 45.60%, respectively, and the concentrations of pyruvate phosphate dikinase and phosphoenolpyruvate carboxylase in maize leave were increased by 29.40% and 42.96%, respectively, in the U+FA treatment. The combined application of urea and FA solution significantly improved soil nutrient availability, increased the concentrations of endogenous hormones in maize, stimulated the activities of enzymes related to nitrogen metabolism, promoted the photosynthetic carbon assimilation efficiency, and ultimately improved crop yield and NUE.

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“…The humic acid treatment induced the highest levels of soluble sugar (Figure 2C) and PRO contents (Figure 2D) compared to the other treatments. A field trial of humic acid treatment conducted by Chen et al showed that humic acid treatment enhanced drought resistance by modulating maize photosynthetic carbon metabolism, hormones and osmo-regulatory substances (Chen et al, 2022). Cellulose and hemicellulose in polysaccharide polymers are important components of plant cell walls and play an indispensable role in resisting cell wall deterioration during the long course of evolution (Silveira et al, 2013).…”

Section: Effects Of Biostimulant Application On Drought Resistance Of...mentioning

confidence: 99%

“…PBs are a class of substances distinct from fertilizers, and they are divided into humic substances, protein hydrolysates, chitosan and seaweed extracts, among other categories, based on the plant responses they cause, rather than their composition (Bhupenchandra et al, 2020). Chen et al showed that humic acid exhibited positive regulatory effects on soil nutrients and plant growth (Chen et al, 2022). Muley et al showed that 75 mg/ L application of chitosan to potato promoted resistance to drought stress while improving growth performance (Muley et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Combined physiological and metabolomic analysis reveals the effects of different biostimulants on maize production and reproduction

Song

Guo

et al. 2022

Front. Plant Sci.

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Plant biostimulants (PBs) are a potential strategy to improve crop growth and grain quality. In the present study, 100 mg/L trehalose, chitosan, humic acid and gamma-aminobutyric acid treatments were applied to analyze the effects of maize production and reproductive characteristics. The contents of nitrogen, phosphorus and potassium and grain quality were significantly affected by the PBs, but not yield. The seed germination rate of all PB treatments was significantly reduced, but the drought resistance of progeny seedlings was significantly improved, with humic acid having the strongest effect. Liquid chromatography mass spectrometry analysis indicated that the disruption of the tricarboxylic acid cycle, probably due to the blockage of intermediate anabolism, reduced the supply of energy and nutrients in the early stages of germination, thus inhibiting seed germination, while the increased resistance of the offspring seedlings may be due to the up-regulation of the synthesis of unsaturated fatty acids and alkaloids by humic acid treatment. This study revealed the similarity and heterogeneity of the effects of different PBs on nutrient accumulation, yield characteristics and grain quality of maize, providing guidance for the application of PBs in intensive and sustainable agricultural production.

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Humic acid modulates growth, photosynthesis, hormone and osmolytes system of maize under drought conditions

Cited by 59 publications

References 67 publications

Applying Biostimulants to Combat Water Deficit in Crop Plants: Research and Debate

Applying Biostimulants to Combat Water Deficit in Crop Plants: Research and Debate

The Combined Application of Urea and Fulvic Acid Solution Improved Maize Carbon and Nitrogen Metabolism

Combined physiological and metabolomic analysis reveals the effects of different biostimulants on maize production and reproduction

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