Plant biostimulants: physiological responses induced by protein hydrolyzed-based products and humic substances in plant metabolism

Nardi, Serenella; Pizzeghello, Diego; Schiavon, Michela; Ertani, Andrea

doi:10.1590/0103-9016-2015-0006

Cited by 297 publications

(254 citation statements)

References 67 publications

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“…These plant-based biostimulants are thought to enhance plant growth, yield via improving the efficiency of plant metabolism, increasing tolerance to abiotic stresses, enhancing quality attributes of crops and facilitating uptake, translocation and assimilation of nutrients etc. (Ertani et al, 2014;Nardi et al, 2016). To examine the potential role of alfalfa leaf extract, it was hypothesized that foliar application of alfalfa leaf extract can reduce the adverse effects of cadmium stress on different growth and physiochemical attributes of different wheat varieties.…”

Section: Introductionmentioning

confidence: 99%

Induction of Cadmium Stress Tolerance in Triticum Aestivum L. By Alfalfa Leaf Extract

Perveen¹

2016

Appl Ecol Env Res

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Abstract.To assess the effect of foliar applications of alfalfa (Medicago sativa L.) leaf extract on three wheat (Triticum aestivum L.) varieties (Punjab-2011, Millat-2011 and Galaxy-2013 under cadmium (Cd) stress, two-week-old wheat plants were subjected to three levels of Cd (i.e. 0, 0.5 and 1.0 mM) stress and then foliarly applied with alfalfa leaf extract (0 and 2 % w/v). Data for 16-week-old wheat plants were collected for growth and physiochemical parameters, while yield were obtained at maturity. Cadmium stress significantly decreased growth, chlorophyll (chl.) a, flavonoids, total free amino acids, total soluble sugars and relative water contents (RWC %), while increased chl. b, relative membrane permeability (RMP %), malondialdehyde (MDA), total phenolics and free proline contents. Foliar treatment with alfalfa leaf extract (2%) significantly increased growth, yield, leaf ascorbic acid, free proline and total soluble sugars, while decreased RMP (%) (in Punjab-2011 and Galaxy-2013), flavonoids and H 2 O 2 contents in all wheat varieties under cadmium stress. Wheat varieties showed significant difference as var. Punjab-2011 excelled in all measured attributes except RMP (%), MDA and activity of POD, however, negative effect of cadmium stress was more prominent in var. Punjab-2011 than Millat-2011 and Galaxy-2013

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Section: Introductionmentioning

confidence: 99%

Induction of Cadmium Stress Tolerance in Triticum Aestivum L. By Alfalfa Leaf Extract

Perveen¹

2016

Appl Ecol Env Res

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“…A vast amount of literature exists on the effects of HS on soil micro-organisms, plant physiology and plant growth, and important reviews include those of Canellas and Olivares [12] and Nardi et al [13], the latter focussing on the biostimulant role of HS and protein hydrolysed-based products. The authors noted that the biostimulatory activity of HS was usually due to hormone-like activity, which may be due to auxins, which were analysed in the HS.…”

Section: Literature Reviewmentioning

confidence: 99%

Commercial Humates in Agriculture: Real Substance or Smoke and Mirrors?

Lyons

Genç

2016

Agronomy

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Soil humic substances (HS) are known to be beneficial for soils and plants, and most published studies of HS and humates, usually conducted under controlled conditions, show benefits. However, the value of commercial humate application in the field is less certain. This review attempts to answer the question: How effective are commercial humates in the field? Commercial humates, especially K humate, are used widely in agriculture today as "soil conditioners". A wide range of benefits is claimed, including growth of beneficial soil microbes; deactivation of toxic metals; improvements in soil structure including water retention capacity, enhanced nutrient and micronutrient uptake and photosynthesis; resistance to abiotic stress, including salinity; and increased growth, yield and product quality. Despite this, there is a surprising lack of solid evidence for their on-farm effectiveness and findings are often inconsistent. The industry relies largely on anecdotal case studies to promote humates, which are often applied at unrealistically low levels. It is recommended that products should be well characterised, physically and chemically, and that careful field studies be conducted on foliar humate application and pelletised humates at realistic rates, targeted to the seedling rhizosphere, for a variety of crops in a range of soils, including low C sandy and saline soils.

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“…Most published studies of HS show wide range of benefits including a growth of beneficial soil microbes, improvements in soil structure including water retention capacity as well as a soil porosity, aeration, compaction, and adhesion (Piccolo et al 1993;Nardi et al 2016;Ouni et al 2014;Ciarkowska et al 2017). Another experiment has shown numerous benefits of HS application to plants including root respiration, enzyme activity, and resistance to abiotic stress like salinity and extreme pH.…”

Section: Introductionmentioning

confidence: 99%

“…These substances can immobilize and neutralize heavy metals, contributing to the process of soil detoxification; however, their main use is to enhance nutrient and micronutrient uptake including their bioavailability and, as a consequence, increase growth, yield, and product quality (Piccolo 1996;Tipping Responsible editor: Elżbieta Jamroz Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11368-017-1907-x) contains supplementary material, which is available to authorized users. 2002;Canellas et al 2002Canellas et al , 2014Canellas et al , 2015Nardi et al 2016). For these reasons, it seems that the use of humic acids as agents which improve soil properties and affect the amount and quality of crops, it may be a perspective direction in the development of modern agriculture.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

Huculak-Mączka

Hoffmann

2018

J Soils Sediments

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Purpose Technological progress and high market demand contributed to a significant interest in the production of fertilizers based on humic acids. The aim of this study was to evaluate the possibilities of using humic acids obtained from lignite in the production of new commercial products. For this purpose, it is necessary to determine the quality standard requirements for such material. Properties of humic acids depend on source of origin as well as method of its extraction. Materials and methods The humic acids were extracted from polish deposit of lignite-Sieniawa Lubuska by alkaline extraction using for this purpose six kinds of extractants: 0.1 M NaOH and 0.25 M NaOH, 0.1 M KOH and 0.25 M KOH, and 0.1 M Na 4 P 2 O 7 and 0.25 M Na 4 P 2 O 7 . The humic samples were used in solid powder form and characterized by UV-Vis spectroscopy, 13 C NMR spectroscopy, fluorescence spectroscopy, and thermal analysis. Results and discussion The determining factor influencing a degree of humic acids extraction from lignite and their structure is type of extractant. The largest efficiency of extraction (about 50%) was obtained with the use of NaOH solutions. All examined humic acids were generally characterized by simple and heterogeneous molecularly structure with low molecular weight and low aromatic polycondensation. Therefore, it can be concluded that humic acids extracted with NaOH and KOH solutions are less condensed than those extracted with Na 4 P 2 O 7 solutions. It can suggest that humic acids obtained from lignite using solutions of Na 4 P 2 O 7 are characterized by a low transformation degree and greater amount of carboxyl groups. Conclusions Low rank coal can be successfully used in agriculture as a rich source of humic acids. Reagent used in their extraction, apart from high efficiency should have a neutral impact on their structure. Studies on the physicochemical properties of humic acids can be helpful in predicting behaviors of such fertilizer components in the environment and in inventing new products taking the principles of sustainable development into consideration.

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Plant biostimulants: physiological responses induced by protein hydrolyzed-based products and humic substances in plant metabolism

Cited by 297 publications

References 67 publications

Induction of Cadmium Stress Tolerance in Triticum Aestivum L. By Alfalfa Leaf Extract

Induction of Cadmium Stress Tolerance in Triticum Aestivum L. By Alfalfa Leaf Extract

Commercial Humates in Agriculture: Real Substance or Smoke and Mirrors?

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

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