Changes in labile phosphorus forms during maturation of vermicompost enriched with phosphorus-solubilizing and diazotrophic bacteria

Busato, Jader Galba; Lima, Lívia Santos; Aguiar, Natália Oliveira; Canellas, Luciano P.; Olivares, Fábio Lopes

doi:10.1016/j.biortech.2012.01.126

Cited by 114 publications

(56 citation statements)

References 27 publications

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“…The benefits of vermicompost to field crops are well documented [66] and are often attributed to its large nutrient potential, content of humified molecules possessing hormone-like activity [67], and presence of bioactive microorganisms. The introduction of a mixed inoculum of PGPB strains of H. seropedicae (HRC 54) and Burkholderia silvatlantica (UENF 101) at the initial stage of the vermicomposting process revealed the increase of total N and water-soluble phosphorus in the mature vermicompost [68], thus showing that the addition of beneficial microorganisms enables the strengthening of the growth substrate. Moreover, in a study on the organic matter molecular composition of different vermicomposts, a significant relationship was found between the presence of long-chain hydrophobic compounds in compost and the preservation of PGPB during 1 year after inoculation [62].…”

Section: Hs and Plant Growth-promoting Bacteriamentioning

confidence: 99%

Physiological responses to humic substances as plant growth promoter

Canellas

Olivares

2014

Chem Biol Techn Agric

387

243

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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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Section: Hs and Plant Growth-promoting Bacteriamentioning

confidence: 99%

Physiological responses to humic substances as plant growth promoter

Canellas

Olivares

2014

Chem Biol Techn Agric

387

243

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“…Furthermore, one of the main mechanism of DEB to solubilize phosphorus is the efficient production of organic acids mainly oxalic, citric, succinic and ascorbic acids [40]. The significant efflux of organic anions in roots treated with humic acids was observed [41] Organic acids are one the main source of carbon to PGPB and the rhizodeposition of labile compounds induced by HA in the inoculation medium can attract the bacteria. Interestingly, the supramolecular structure disassembling by organic acid that was well reported, release bioactive compound that modulates root architecture and increase epiphytic and endophytic bacteria colonization.…”

Section: Physiological Changesmentioning

confidence: 99%

Plant growth promoting bacteria and humic substances: crop promotion and mechanisms of action

Olivares

Busato

Paula

et al. 2017

Chem. Biol. Technol. Agric.

127

102

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High-external input agriculture is one of the most disruptive human activities, which have been justified by the current economic paradigm due to high productivity and the need to feed a growing population. However, we are dangerously close to the edge of the planet resources and both hunger and food insecurity has increased. Limiting the use of non-renewable chemical fertilizers and pesticides, changing water management, enhancing diversity and considering the often-neglected social dimension of agriculture are the bases to other chemical and biological technologies to agriculture. Biological inputs can stimulate the substitution of chemical inputs without questioning the current fundaments or can be adopted as a turning point to intensify the harsh processes of transition to more environmental friendly agriculture. The debate is open and our contribution is to develop the scientific basis for biological inputs that, unlike soluble fertilizers and pesticides, depend on a number of factors for its success in promoting crop yield. In this review, we showed the results obtained with the combined use of diazotrophic endophytic bacteria and humic substances in diverse crops (sugarcane, maize, tomato, common beans and pineapple), presenting the main morphological and physiological changes induced by biological technology. A snapshot of the state of the art of the use of plant growth promoting bacteria together with humic substances was provided, showing their potential especially when plants are subjected to moderate to severe abiotic stress. The number of studies reporting the combined use of plant growth promoting bacteria and humic substances is surprisingly low. There is an open avenue for research and encouraging debate is the goal. To overcome the conventional agriculture, maintaining productivity levels is more than scientific challenge, is a humanitarian duty. The biological inputs can help in this purpose.

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“…The organic acid production during the phosphate solubilization was determined by using HPLC according to Busato et al [20] method. The production of indole-3-acetic acid (IAA) with 0×, 1× and 2× concentration of chlorpyrifos was quantitatively determined by the method of Gordon and Weber [21], later modified by Brick et al [22].…”

Section: Assessment Of Characteristics For Plant Growth Promotionmentioning

confidence: 99%