RELEASE OF THE HORMONE-LIKE ACTIVITIES FROM <i>Allolobophora rosea</i> (Sav.) AND <i>Allolobophora caliginosa</i> (Sav.) FECES

Nardi, Serenella; Arnoldi, G.; Dell'Agnola, G.

doi:10.4141/cjss88-054

Cited by 72 publications

(52 citation statements)

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“…Kelleher and Simpson (2006) reported that humic substances extracted from soils contained proteins, carbohydrates, aliphatic biopolymers, and lignin, which represent the principal compound classes in plants and microbes. In accordance with this theory, previous studies have suggested that humic substances (HS) have only an apparent high molecular size, which can be reversibly disrupted by treating humic solutions with low concentrations of mono, di, and tricarboxylic acids (Nardi et al 1988;Nardi et al 1996). More recently, numerous studies have shown that the amphiphilic properties of the organic acids in root exudates can dissociate HS into low molecular size and high molecular size (Nardi et al 1997(Nardi et al , 2000(Nardi et al , 2002Piccolo et al 2002;Piccolo and Spiteller 2003).…”

Section: Humic Acidsmentioning

confidence: 77%

Agricultural uses of plant biostimulants

2014

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Background Plant biostimulants are diverse substances and microorganisms used to enhance plant growth. The global market for biostimulants is projected to increase 12 % per year and reach over $2,200 million by 2018. Despite the growing use of biostimulants in agriculture, many in the scientific community consider biostimulants to be lacking peer-reviewed scientific evaluation. Scope This article describes the emerging definitions of biostimulants and reviews the literature on five categories of biostimulants: i. microbial inoculants, ii. humic acids, iii. fulvic acids, iv. protein hydrolysates and amino acids, and v. seaweed extracts.Conclusions The large number of publications cited for each category of biostimulants demonstrates that there is growing scientific evidence supporting the use of biostimulants as agricultural inputs on diverse plant species. The cited literature also reveals some commonalities in plant responses to different biostimulants, such as increased root growth, enhanced nutrient uptake, and stress tolerance.

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Section: Humic Acidsmentioning

confidence: 77%

Agricultural uses of plant biostimulants

2014

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“…Several authors have found evidence of HS improving plant growth and physiology (Bottomley, 1914a(Bottomley, , 1914b(Bottomley, , 1917O'Donnell, 1973;Cacco and Dell'Agnola, 1984;Dell'Agnola and Nardi, 1987;Nardi et al, 1988;Schiavon et al, 2008;Pizzeghello et al, 2013). These positive effects on plants could be ascribed, in the main, to hormone-like activity, as a number of hormones enclosed in the humus structure have been identified (Muscolo et al, 1998;Nardi et al, 2000b;Pizzeghello et al, 2001).…”

Section: Biological Activity Of Humic Substancesmentioning

confidence: 98%

“…According to previous investigations (Piccolo, 2001(Piccolo, , 2002, HS are supramolecular aggregates and their stability and reactivity depend on the solution's ionic strength and pH of the surrounding environment. Low molecular weight organic acids, as well as root exudates, break the macro aggregate structure and generate subunits of biological active molecules (Nardi et al, 1988;Nardi et al, 2002bNardi et al, , 2005Canellas and Olivares, 2014).…”

Section: Biological Activity Of Humic Substancesmentioning

confidence: 99%

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

Nardi

Pizzeghello

Schiavon

et al. 2016

Sci. agric. (Piracicaba, Braz.)

297

196

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In recent years, the use of biostimulants in sustainable agriculture has been growing. Biostimulants can be obtained from different organic materials and include humic substances (HS), complex organic materials, beneficial chemical elements, peptides and amino acids, inorganic salts, seaweed extracts, chitin and chitosan derivatives, antitranspirants, amino acids and other N-containing substances. The application of biostimulants to plants leads to higher content of nutrients in their tissue and positive metabolic changes. For these reasons, the development of new biostimulants has become a focus of scientific interest. Among their different functions, biostimulants influence plant growth and nitrogen metabolism, especially because of their content in hormones and other signalling molecules. A significant increase in root hair length and density is often observed in plants treated with biostimulants, suggesting that these substances induce a "nutrient acquisition response" that favors nutrient uptake in plants via an increase in the absorptive surface area. Furthermore, biostimulants positively influence the activity and gene expression of enzymes functioning in the primary and secondary plant metabolism. This article reviews the current literature on two main classes of biostimulants: humic substances and protein-based biostimulants. The characteristic of these biostimulants and their effects on plants are thoroughly described.

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“…The humic and fulvic acid in the humus dissolves insoluble minerals in the organic matter and makes them readily available to plants and in addition they also help plants to overcome stress and stimulates plant growth (Sinha et al 2010). Studies on biological activities of vermicompost derived humic substances, revealed that they had similar growthpromoting hormonal effect (Dell'Agnola and Nardi 1987; Nardi et al 1988;Muscolo et al 1993). The humic materials extracted from vermicomposts have been reported to produce auxin-like cell growth and nitrate metabolism in carrots (Daucus carota) (Muscolo et al 1996).…”

Section: Role Of Vermicompost In Plant Growth Promotionmentioning

confidence: 99%

“…Since earthworms increase the microbial activity by several folds they are considered as important agents which enhance the production of plant growth regulators (Nielson 1965;Graff and Makeschin 1980;Dell'Agnola and Nardi 1987;Grappelli et al 1987;Tomati et al 1987Tomati et al , 1988Edwards and Burrows 1988;Nardi et al 1988;Edwards 1998). Plant growth stimulating substances of microbial origin were isolated from tissues of Aporrectodea longa, L. terrestris and Dendrobaena rubidus and indole like substances were detected from the tissue extracts of A. caliginosa, L. rubellus and E. foetida which increased the growth of peas (Nielson 1965) and dry matter production of rye grass (Graff and Makeschin 1980).…”

Section: Role Of Vermicompost In Plant Growth Promotionmentioning

confidence: 99%

Microbial Diversity of Vermicompost Bacteria That Exhibit Useful Agricultural Traits and Waste Management Potential

Pathma¹,

Sakthivel²

2014

Organic Agricultural Practices

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Vermicomposting is a non-thermophilic, boioxidative process that involves earthworms and associated microbes. This biological organic waste decomposition process yields the biofertilizer namely the vermicompost. Vermicompost is a finely divided, peat like material with high porosity, good aeration, drainage, water holding capacity, microbial activity, excellent nutrient status and buffering capacity thereby resulting the required physiochemical characters congenial for soil fertility and plant growth. Vermicompost enhances soil biodiversity by promoting the beneficial microbes which inturn enhances plant growth directly by production of plant growth-regulating hormones and enzymes and indirectly by controlling plant pathogens, nematodes and other pests, thereby enhancing plant health and minimizing the yield loss. Due to its innate biological, biochemical and physiochemical properties, vermicompost may be used to promote sustainable agriculture and also for the safe management of agricultural, industrial, domestic and hospital wastes which may otherwise pose serious threat to life and environment.

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RELEASE OF THE HORMONE-LIKE ACTIVITIES FROM Allolobophora rosea (Sav.) AND Allolobophora caliginosa (Sav.) FECES

Cited by 72 publications

References 0 publications

Agricultural uses of plant biostimulants

Agricultural uses of plant biostimulants

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

Microbial Diversity of Vermicompost Bacteria That Exhibit Useful Agricultural Traits and Waste Management Potential

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