Auxins of microbial origin and their use in agriculture

Keswani, Chetan; Singh, Satyendra Pratap; Cueto, Laura; Garcı́a-Estrada, Carlos; Mezaache-Aichour, Samia; Glare, Travis R.; Borriss, Rainer; Singh, Surya Pratap; Blázquez, Miguel Á.; Sansinenea, Estibaliz

doi:10.1007/s00253-020-10890-8

Cited by 105 publications

(68 citation statements)

References 147 publications

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“…Solicoccozyma terrea is a basidiomycetous yeast commonly found in soil. It is known for its production of indole-3-acetic acid (IAA), which is the most common phytohormone occurring in plants, and it regulates various aspects of plant growth and development [83,84]. Fusarium solani is a common and ubiquitous soil species.…”

Section: Discussionmentioning

confidence: 99%

The Mycobiota of High Altitude Pear Orchards Soil in Colombia

Nicola

Landínez-Torres

Zambuto

et al. 2021

Biology

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In Colombia, the cultivation of deciduous fruit trees such as pear is expanding for socio-economic reasons and is becoming more and more important for the local population. Since organized cultivation is slowly replacing sustenance cultivation, scientific information on the present agro-environment is needed to proceed in this change in an organic and environmentally friendly way. In particular, this study is an accurate description of the mycobiota present in the bulk soil of two different high altitude pear orchards in the Colombian Andes. The metabarcoding of soil samples allowed an in-depth analysis of the whole fungal community. The fungal assemblage was generally dominated by Ascomycota and secondly by Mortierellomycota. As observed in other studies in Colombia, the genus Mortierella was found to be especially abundant. The soil of the different pear orchards appeared to host quite different fungal communities according to the soil physico-chemical properties. The common mycobiota contained 35 fungal species, including several species of Mortierella, Humicola, Solicoccozyma and Exophiala. Moreover, most of the identified fungal species (79%) were recorded for the first time in Colombian soils, thus adding important information on soil biodiversity regarding both Colombia and pear orchards.

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Section: Discussionmentioning

confidence: 99%

The Mycobiota of High Altitude Pear Orchards Soil in Colombia

Nicola

Landínez-Torres

Zambuto

et al. 2021

Biology

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“…The same occurs with the increase in root biomass, which represents a benefit to the plant, since it increases the absorption surface for the uptake of nutrients and water, in addition to improving its stability since it has a better anchorage to the ground (Santos et al 2019). It was observed that the majority of the tested strains increased different growth indicators of sorghum, and the increase in sorghum root biomass generated by the studied strains could be attributable to the IAA production, since the IAA production has been reported to promote root proliferation (Khalid et al 2004, Keswani et al 2020.…”

Section: Discussionmentioning

confidence: 90%

“…Moreover, the microbial synthesis of the phytohormone auxin (indole acetic acid, IAA) has been known for a long time, it is known that 80 % of the microorganisms isolated from the rhizosphere of various crops present the ability to synthesize and release auxins as secondary metabolites (Keswani et al 2020). IAA plays a critical role in plant growth and development, as well as it can be produced as a defense response in diverse ways (Casanova-Sáez et al 2021).…”

mentioning

confidence: 99%

Plant growth-promoting bacteria belonging to the genera <em>Pseudomonas</em> and <em>Bacillus</em> improve the growth of sorghum seedings in a low-nutrient soil

et al. 2021

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Background: Deficiency in sorghum growth in ecosystems of low-nutrient soils has been scarcely studied. This soil deficiency can be overcome by the addition of plant growth-promoting bacteria which increase sorghum growth. Questions and/or Hypotheses: indole acetic acid (IAA) producing and phosphate solubilizing bacteria can promote sorghum growth under nutritional stress. Studied species: Sorghum bicolor (L.) Moench. Study site and dates: Mexico City, 2018. Methods: Of the twelve bacterial strains utilized, three produce IAA (group BI), two strains produce IAA and siderophores (BIS group), four strains produce IAA and solubilize phosphate (BIP group), and three strains produce IAA, solubilize phosphate, and produce siderophores (BIPS group). Hydroponic bioassays and low-nutrient soil bioassay were used. Results: In hydroponic bioassays, for BI and BIS groups, five strains significantly increased the growth parameters with respect to the control, and for the BIP and BIPS groups, two strains promoted stem development and shoot dry weight. In a low-nutrient soil bioassay, Pseudomonas sp. BI-1 (from BI group) was the one that presented the highest percentages 32, 48, 140 and 79 % in stem diameter, height and dry weight of the shoot and dry weight of the root, respectively, followed by the P. mohnii BIPS-10 strain (from BIPS group) that exhibited similar results. Conclusions: IAA producing Pseudomonas strains improve the sorghum growth in a low-nutrient soil and suggest thatPseudomonas sp. BI-1 and P. mohnii BIPS-10 could be used as potential bioinoculants for sorghum.

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“…Both strains produce higher amounts of IAA than the commercial CIAT899 inoculant (Figure 2). Rhizobacteria-produced IAA improved plant growth by several mechanisms and became an important selection criterion for the choice of commercially used inoculum (Alemneh et al, 2020;Keswani et al, 2020). A striking observation was that the isolate B3 was more efficient in phosphate solubilization in the culture media than CIAT899.…”

Section: Symbiotic Efficiencymentioning

confidence: 99%

Isolation and Characterization of High-Efficiency Rhizobia From Western Kenya Nodulating With Common Bean

2021

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Common bean is one of the primary protein sources in third-world countries. They form nodules with nitrogen-fixing rhizobia, which have to be adapted to the local soils. Commercial rhizobial strains such as Rhizobium tropici CIAT899 are often used in agriculture. However, this strain failed to significantly increase the common bean yield in many places, including Kenya, due to the local soils’ low pH. We isolated two indigenous rhizobial strains from the nodules of common bean from two fields in Western Kenya that have never been exposed to commercial inocula. We then determined their ability to fix nitrogen in common beans, solubilize phosphorus, and produce indole acetic acid. In greenhouse experiments, common bean plants inoculated with two isolates, B3 and S2 in sterile vermiculite, performed better than those inoculated with CIAT899 or plants grown with nitrogen fertilizer alone. In contrast to CIAT899, both isolates grew in the media with pH 4.8. Furthermore, isolate B3 had higher phosphate solubilization ability and produced more indole acetic acid than the other two rhizobia. Genome analyses revealed that B3 and S2 are different strains of Rhizobium phaseoli. We recommend fieldwork studies in Kenyan soils to test the efficacy of the two isolates in the natural environment in an effort to produce inoculants specific for these soils.

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Auxins of microbial origin and their use in agriculture

Cited by 105 publications

References 147 publications

The Mycobiota of High Altitude Pear Orchards Soil in Colombia

The Mycobiota of High Altitude Pear Orchards Soil in Colombia

Plant growth-promoting bacteria belonging to the genera <em>Pseudomonas</em> and <em>Bacillus</em> improve the growth of sorghum seedings in a low-nutrient soil

Isolation and Characterization of High-Efficiency Rhizobia From Western Kenya Nodulating With Common Bean

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