The Role of Microbial Inoculants in Integrated Crop Management Systems

Velivelli, Siva L. S.; Sessitsch, Angela; Prestwich, Barbara Doyle

doi:10.1007/s11540-014-9278-9

Cited by 47 publications

(28 citation statements)

References 113 publications

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“…In the current case of dual inoculation, the potential to produce secondary metabolites, e.g., GAs and IAA, of endophytes might be a contributing factor toward tolerating metal toxicity and promoting growth attributes via enhancing nutrient uptake by proliferating roots and mediating roots exudates under normal as well as Al- and Zn-contaminated soil ( Velivelli et al, 2014 ; Singh et al, 2016 ). As microbial IAA can loosen the roots cells walls and change the properties of root absorption by increasing root, hairs, length and surface as well as enhancing the excretion of root exudates, which subsequently provide additional nutrients to support the growth of microorganism ( Etesami, 2018 ).…”

Section: Discussionmentioning

confidence: 99%

Endophytic Microbial Consortia of Phytohormones-Producing Fungus Paecilomyces formosus LHL10 and Bacteria Sphingomonas sp. LK11 to Glycine max L. Regulates Physio-hormonal Changes to Attenuate Aluminum and Zinc Stresses

et al. 2018

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The compatible microbial consortia containing fungal and bacterial symbionts acting synergistically are applied to improve plant growth and eco-physiological responses in extreme crop growth conditions. However, the interactive effects of phytohormones-producing endophytic fungal and bacterial symbionts plant growth and stress tolerance under heavy metal stress have been least known. In the current study, the phytohormones-producing endophytic Paecilomyces formosus LHL10 and Sphingomonas sp. LK11 revealed potent growth and tolerance during their initial screening against combined Al and Zn (2.5 mM each) stress. This was followed with their co-inoculation in the Al- and Zn-stressed Glycine max L. plants, showing significantly higher plant growth attributes (shoot/root length, fresh/dry weight, and chlorophyll content) than the plants solely inoculated with LHL10 or LK11 and the non-inoculated (control) plants under metal stresses. Interestingly, under metal stress, the consortia exhibited lower metal uptake and inhibited metal transport in roots. Metal-induced oxidative stresses were modulated in co-inoculated plants through reduced hydrogen peroxide, lipid peroxidation, and antioxidant enzymes (catalase and superoxide dismutase) in comparison to the non-inoculated plants. In addition, endophytic co-inoculation enhanced plant macronutrient uptake (P, K, S, and N) and modulated soil enzymatic activities under stress conditions. It significantly downregulated the expression of heavy metal ATPase genes GmHMA13, GmHMA18, GmHMA19, and GmPHA1 and upregulated the expression of an ariadne-like ubiquitin ligase gene GmARI1 under heavy metals stress. Furthermore, the endogenous phytohormonal contents of co-inoculated plants revealed significantly enhanced gibberellins and reduced abscisic acid and jasmonic acid contents, suggesting that this endophytic interaction mitigated the adverse effect of metal stresses in host plants. In conclusion, the co-inoculation of the endophytic fungus LHL10 and bacteria LK11 actively contributed to the tripartite mutualistic symbiosis in G. max under heavy metal stresses; this could be used an excellent strategy for sustainable agriculture in the heavy metal-contaminated fields.

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Section: Discussionmentioning

confidence: 99%

Endophytic Microbial Consortia of Phytohormones-Producing Fungus Paecilomyces formosus LHL10 and Bacteria Sphingomonas sp. LK11 to Glycine max L. Regulates Physio-hormonal Changes to Attenuate Aluminum and Zinc Stresses

et al. 2018

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“…The fact that Fe applied to the rhizosphere is quickly converted into plant-unavailable Fe 3+ forms, and the fact that Fe has low xylem mobility and translocation capacity in the potato plant limits the prospect of biofortifying potatoes with Fe fertilizer (Rengel et al 1999;Rashid and Ryan 2004;White and Broadley 2011). Future studies should investigate which soil factors could eventually be managed to stabilize tuber Fe output across environments and ensure that a higher part of the total soil Fe becomes plant available and is taken up by roots, e.g., the usage of acidifying fertilizers, such as urea or ammonium fertilizers, or inoculating soils with mineral solubilizing microorganisms, such as Zn and Fe transporting arbuscular mycorrhizal fungi (Lehmann and Rillig 2015) or siderophore producing bacteria that make Fe plant available through chelation (Velivelli et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Can Andean potatoes be agronomically biofortified with iron and zinc fertilizers?

Kromann¹,

Valverde

Alvarado

et al. 2016

Plant Soil

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Aims The aim of this study was to investigate the proofof-concept that Andean potato (Solanum tuberosum L., Andigenum Group) can be agronomically biofortified with iron (Fe) and zinc (Zn) fertilizers. Methods Greenhouse and field experiments were conducted in the Ecuadorian Andes with varying rates of foliar and soil applied Fe and Zn fertilizers to investigate the potential resulting increase in tuber Fe and tuber Zn concentrations.Results The study showed that simple fertilizer practices enhancing Zn supply to potato plants can increase tuber Zn concentrations. The rate of increase of tuber Zn following Zn fertilization was similar across cultivars. A concomitant negative effect of high rates of Zn applications on yield was not seen, and a maximum Zn application level for increasing tuber Zn concentration was not identified. A positive tuber yield effect was seen at one field site. High rates of foliar Zn application reached a 2.51-fold tuber Zn increase, and high rates of soil Zn application a 1.91-fold tuber Zn increase. The experiments showed no positive correlation between Fe fertilization and Fe concentration in tubers. Moreover, the study showed a strong effect of site on the concentration of Fe and Zn in tubers, and the tuber mineral concentrations across sites and treatments were negatively correlated with tuber yield. Conclusions The results confirmed the proof of concept that Andean potato cultivars can be agronomically Znbiofortified with foliar and soil applied Zn fertilizers. Tuber Fe concentrations of Andean potatoes were not increased with Fe fertilization.

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“…It has been known that sulfur-oxidizing bacteria (SOB) can efficiently convert elemental sulfur and organic carbon of sulfur (unavailable form) into sulfate (available form for the plant) by the sulfur oxidation process (Losák et al 2008;Fageria 2009;Ullah et al 2014;Prenafeta-Boldúet al 2014;Velivelli et al 2014;Sridar et al 2015). The oxidation reaction of sulfur to sulfate is as follows (Ryu et al 2003):…”

Section: Introductionmentioning

confidence: 99%

Soil properties and sulfur-oxidizing bacterial diversity in response to different planting patterns of shallot (Allium ascalonicum)

Juwanda¹,

Sakhidin

Saparso

et al. 2020

Biodiversitas

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Abstract. Juwanda M, Sakhidin, Saparso, Kharisun. 2020. Soil properties and sulfur-oxidizing bacterial diversity in response to different planting patterns of shallot (Allium ascalonicum). Biodiversitas 21: 2832-2839. Sulfur is one of the primary elements required by plants for growth and development. Sulfur-oxidizing bacteria (SOB) can oxidize sulfur to sulfate, which is directly taken up by plant roots. This study aims to evaluate the soil properties and SOB diversity in various shallot planting patterns, i.e. PP1 (shallot-dry season-shallot-shallot), PP2 (shallot-dry season-shallot-rice), and PP3 (shallot-pulses-shallot-rice). Soil samples were collected from the rhizosphere of the shallot plant and analyzed for the soil properties based on the standard methods. Bacteria isolation was cultured on Starkey broth and Starkey agar. Bacteria isolate was identified based on the 16S rRNA gene sequence and compared to the GenBank database. The results showed that shallot planting patterns influence soil properties and SOB diversity. The highest content of sulfate (41.31 ppm), organic C (0.957 %), organic matter (1.650%), C/N ratio (9.57), and SOB diversity was obtained in PP3 planting pattern. Three bacterial strains have been successfully isolated i.e. A-3245D, B-3246F, and C-3247C with their closest related to Burkholderia cepacia, Klebsiella variicola, and Klebsiella aerogenes, respectively. The highest diversity and population density of SOB was in the PP3 planting patterns, i.e Burkholderia cepacia (7.45 x 105 CFU/mL); Klebsiella variicola (1.79 x 107 CFU/mL; Klebsiella aerogenes: 3.9 x 106 CFU/mL). K. variicola can be found in three planting patterns of shallot.

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The Role of Microbial Inoculants in Integrated Crop Management Systems

Cited by 47 publications

References 113 publications

Endophytic Microbial Consortia of Phytohormones-Producing Fungus Paecilomyces formosus LHL10 and Bacteria Sphingomonas sp. LK11 to Glycine max L. Regulates Physio-hormonal Changes to Attenuate Aluminum and Zinc Stresses

Endophytic Microbial Consortia of Phytohormones-Producing Fungus Paecilomyces formosus LHL10 and Bacteria Sphingomonas sp. LK11 to Glycine max L. Regulates Physio-hormonal Changes to Attenuate Aluminum and Zinc Stresses

Can Andean potatoes be agronomically biofortified with iron and zinc fertilizers?

Soil properties and sulfur-oxidizing bacterial diversity in response to different planting patterns of shallot (Allium ascalonicum)

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