A Beginner’s Guide to Osmoprotection by Biostimulants

Jiménez-Árias, David; García-Machado, Fráncisco J.; Morales-Sierra, Sarai; García-García, Ana L.; Herrera, Antonio J.; Valdés, Francisco; Luis, Juan; Borges, Andrés A.

doi:10.3390/plants10020363

Cited by 30 publications

(25 citation statements)

References 219 publications

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“…Water deficit stress can be prevented using biostimulants [12], which seems to be both attractive and eco-friendly to prevent losses caused by water shortage [38]. Indeed, the use of these kinds of substances to cope with stress is a prolific field of research that issues a huge number of publications per year.…”

Section: Discussionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

“…Biostimulants are presented as a potential new way to aid in water management [10][11][12], reducing field productivity losses [13]. They are compatible with the European eco-friendly philosophy [14] because most of the compounds used are from natural sources [15] and easily degraded in soil [16].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…L-glycine (present in SCG PH 6 and 89 only, at 47.3 and 6.50% of total free amino acids respectively) is associated with increased crop quality and yield and is an integral component in the industrial production of aminochelate fertilizers [51][52][53]. However it must be noted that proline, which has been extensively investigated for osmotic protection against abiotic stress, was not detected in the SCG PH [54].…”

Section: Degree Of Hydrolysis (Dh) and Free L-amino Acid Content Of Scg-protein Hydrolysates (Scg Ph)mentioning

confidence: 99%

Soil Amendments and Biostimulants from the Hydrothermal Processing of Spent Coffee Grounds

Massaya

Mills-Lamptey

Chuck

2022

Waste Biomass Valor

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Purpose Use of spent coffee grounds (SCG) in horticulture has deleterious effects on plant health and yields, suggesting that processing of SCG is necessary prior to field application. To this end, two products of an SCG based biorefinery were investigated: primary chars from the hydrothermal carbonisation (HTC) of SCG and enzymatic protein hydrolysates. Methods Primary chars were produced under various HTC regimes from raw SCG, and alkaline pre-treated SCG. Primary chars were evaluated in germination toxicity tests and under soil stress conditions using Arabidopsis thaliana (Arabidopsis). Proteolytic enzymes were screened in production of SCG protein hydrolysates; biostimulant activity in the growth of Saccharomyces Cerevisiae, germination of Arabidopsis thaliana under normal and cold conditions and auxin-like activity was assessed. Results Toxicity assays of primary chars with land cress (Barbarea verna L.) showed a maximum 35% increase in root length, relative to the control. In Arabidopsis growth trials, outstanding performances were recorded at 100 t/ha for primary chars produced from alkaline pre-treated SCG: rosette diameter and dry weight increased by 531 and 976%, respectively, relative to the control. SCG protein hydrolysate from Bacillus lichenformis proteolysis (glycine present at 47% of total) gave 140% increase in Arabidopsis seeds with expanded cotyledons, relative to the control. Auxin-like activity was also measured in the extracts. Conclusion Cascade process design was used to valorise a major waste stream. Removal of phytotoxic components from SCG hydrochars enhanced plant growth, while biostimulant activity of SCG protein hydrolysates was observed. Graphical Abstract

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“…Currently these products include extracts of seaweed, humic substances (humic acids and fulvic acids), chitin and chitosan derivatives, amino acids, protein hydrolysates, and microbes (Al-Juthery et al, 2020). Some have been showing promise for commercial agriculture, not only for enhancing plant growth above-and below-ground and/or crop productivity as it has been reported currently (Grover et al, 2020;Jiménez-Arias et al, 2021;Sakr et al, 2021), but also more specifically in enhancing plant defense against pests and pathogens (Brown and Saa, 2015).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Biostimulants on Induced Plant Defense

et al. 2021

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The search for innovative and alternative methods for chemical control to manage pests is an increasingly growing reality. The use of biostimulants such as plant growth promoting rhizobacteria (PGPR) and humic acids (HA) has been shown to improve many agronomic characteristics of plants while increasing yield. These biostimulants also alter the production of secondary metabolites with consequences for insect herbivores. Here we review the role of biostimulants such as PGPR and HA in promoting and eliciting plant defenses. The cascading effects of using these biostimulants on insect herbivores and their natural enemies are discussed in this context. Synergism between biostimulants are also discussed. The potential role of these products in augmenting agricultural productivity is highlighted as is further need for additional research. This review highlights the potential of this tool to enhance integrated pest management in agricultural production systems, reduce the use of pesticides, and increase the efficiency of fertilization while supporting healthier more pest-resistant plants.

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A Beginner’s Guide to Osmoprotection by Biostimulants

Cited by 30 publications

References 219 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

Soil Amendments and Biostimulants from the Hydrothermal Processing of Spent Coffee Grounds

The Effects of Biostimulants on Induced Plant Defense

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