Relationships Between Chemical Characteristics and Root Growth Promotion of Humic Acids Isolated From Brazilian Oxisols

Canellas, Luciano P.; Spaccini, Riccardo; Piccolo, Alessandro; Dobbss, Leonardo Barros; Okorokova‐Façanha, Anna L.; Santos, Gabriel de Araújo; Olivares, Fábio Lopes; Façanha, Arnoldo Rocha

doi:10.1097/ss.0b013e3181bf1e03

Cited by 76 publications

(68 citation statements)

References 38 publications

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“…Promotion of root system development is the most commonly reported initial effect of humic acids on plant growth. For example, enhancement of lateral roots or general increased seedling root growth has been reported with tomato (Adani et al 1998;Canellas et al 2011), Arabidopsis Canellas et al 2010), wheat (Tahir et al 2011;Peng et al 2001), maize (Canellas et al 2002 andCanellas et al 2009;Eyheraguibel et al 2008;Jindo et al 2012), pepper (Cimrin et al 2010), and Lantana camara (Costa et al 2008). Shoot growth promotion by humic acids has also been reported with cucumber (Mora et al 2010), tomato (Adani et al 1998;Lulakis and Petsas 1995), wheat (Tahir et al 2011), maize (Eyheraguibel et al 2008), and pepper (Cimrin et al 2010).…”

Section: Specific Effects Of Humic Acids On Plantsmentioning

confidence: 89%

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: Specific Effects Of Humic Acids On Plantsmentioning

confidence: 89%

Agricultural uses of plant biostimulants

2014

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“…Their environmental reactivity is dictated by their hydophobic/hydrophilic ratio [3] and a detailed molecular characterization of HS would eventually allow a structure-activity relationship between humic molecules and their activity inside plant cells [12][13][14]. Manufactured technologies for controlling HS activity can now take a boost.…”

Section: Introductionmentioning

confidence: 99%

Physiological responses to humic substances as plant growth promoter

Canellas

Olivares

2014

Chem Biol Techn Agric

387

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Humic substances (HS) have been widely recognized as a plant growth promoter mainly by changes on root architecture and growth dynamics, which result in increased root size, branching and/or greater density of root hair with larger surface area. Stimulation of the H + -ATPase activity in cell membrane suggests that modifications brought about by HS are not only restricted to root structure, but are also extended to the major biochemical pathways since the driving force for most nutrient uptake is the electrochemical gradient across the plasma membrane. Changes on root exudation profile, as well as primary and secondary metabolism were also observed, though strongly dependent on environment conditions, type of plant and its ontogeny. Proteomics and genomic approaches with diverse plant species subjected to HS treatment had often shown controversial patterns of protein and gene expression. This is a clear indication that HS effects of plants are complex and involve non-linear, cross-interrelated and dynamic processes that need be treated with an interdisciplinary view. Being the humic associations recalcitrant to microbiological attack, their use as vehicle to introduce beneficial selected microorganisms to crops has been proposed. This represents a perspective for a sort of new biofertilizer designed for a sustainable agriculture, whereby plants treated with HS become more susceptible to interact with bioinoculants, while HS may concomitantly modify the structure/activity of the microbial community in the rhizosphere compartment. An enhanced knowledge of the effects on plants physiology and biochemistry and interaction with rhizosphere and endophytic microbes should lead to achieve increased crop productivity through a better use of HS inputs in Agriculture.

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“…Biofragmentos provenientes de plantas e microrganismos podem ser preservados da degradação no interior do domínio hidrofóbico da supramolécula húmica (SPACCINI et al, 2000) e liberadas para o meio via ruptura dos agregados húmicos, desencadeada pela adição de ácidos orgânicos (PICCOLO, 2002). Foi observado previamente que a promoção da atividade das bombas de H + de MP varia a hidrofobicidade dos AH (CANELLAS et al, 2009). Além disso, o tratamento de plântulas com AH modificou o perfil de exsudação de ácidos orgânicos pelas raízes, aumentando a concentração destes em solução e a bioatividade dos AH (CANELLAS et al, 2008).…”

Section: Introductionunclassified