A novel strain of Pseudomonas inhibits Colletotrichum gloeosporioides and Fusarium oxysporum infections and promotes germination of coffee

Kejela, Tekalign; Thakkar, Vasudev R.; Patel, Ravi R.

doi:10.1016/j.rhisph.2017.05.002

Cited by 16 publications

(9 citation statements)

References 44 publications

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“…The work was performed using root exudates from two genotypes differing in their tolerance to salt and heat stress: while Carrizo is a salt-sensitive but heat-tolerant citrus rootstock, Macrophylla had the opposite behavior (salt-stress tolerant and heatsensitive,Vives-Peris et al, 2017). Although the role of P. putida as PGPR has been well established in a wide variety of plants as coffee, cocoa or coconut (Kejela et al, 2017; Khadeejath Rajeela et al, 2017), to our knowledge there is no information related the possible effect of Novosphingobium sp. HR1a on plants, although other strains of this genus as Novosphingobium oryzae or Novosphingobium pokkalii have been reported as PGPRs (Krishnan et al, 2017;Zhang et al, 2016).…”

Section: Discussionmentioning

confidence: 98%

Root exudates from citrus plants subjected to abiotic stress conditions have a positive effect on rhizobacteria

Vives‐Peris

Molina

Segura

et al. 2018

Journal of Plant Physiology

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Plants are constantly releasing root exudates to the rhizosphere. These compounds are responsible for different (positive or negative) interactions with other organisms, including plants, fungi or bacteria. In this work, the effect of root exudates obtained from in vitro cultured citrus plants on two rhizobacteria (Pseudomonas putida KT2440 and Novosphingobium sp. HR1a) was evaluated. Root exudates were obtained from two citrus genotypes differing in their sensitivity to salt and heat stress and differentially affected the growth of both rhizobacteria. Root exudates from salt-stressed plants of C. macrophylla (salt tolerant) induced an increase in bacterial growth higher than that obtained from Carrizo citrange exudates (salt sensitive). Root exudates from heat-stressed plants also had a positive effect on bacterial growth, which was more evident in the heat-sensitive C. macrophylla. These results reveal that the growth of these rhizobacteria can be modulated through citrus root exudates and can change depending on both the stress conditions as well as the genotype. Biosensors P. putida KT2442 (pMIS5) and Novosphingobium sp. HR1a (pPAH) were used to test the presence of proline and salicylates in root exudates by measuring β-galactosidase activity. This activity increased in the presence of root exudates obtained from stressed plants to a higher extent in the case of exudates obtained from the genotype resistant to each particular stress, indicating that those root exudates contain larger quantities of proline and salicylates, as it has been described previously. Our data reveals that both P. putida KT2442 (pMIS5) and Novosphingobium sp. HR1a (pPAH), could be used as biosensors of plant stress.

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Section: Discussionmentioning

confidence: 98%

Root exudates from citrus plants subjected to abiotic stress conditions have a positive effect on rhizobacteria

Vives‐Peris

Molina

Segura

et al. 2018

Journal of Plant Physiology

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“…These F. oxysporum strains infect and kill many commercially harvested crops such as tomatoes, peppers, potatoes, eggplant, lettuce, legumes, strawberries and other species. This fungus is resistant to most available antifungal drugs, these infections are serious and frequently fatal in mammals [15].…”

Section: Antioxidant Activity Evaluationmentioning

confidence: 99%

“…Penicillium expansum is a blue mold which is a widespread postharvest disease of fruits, resulting in great economic losses during a long-term storage of harvested fruits [14]. Fusarium oxysporum is an ascomycete fungus which infects plants either by mycelia or by germinating spores penetrating the plant roots preventing the plant from transporting nutrients [15].…”

mentioning

confidence: 99%

Chemical Composition and Active Properties Evaluation of Wild Oregano (Origanum Vulgare) and Ginger (Zingiber Officinale-Roscoe) Essential Oils

Deleanu¹,

Popa²,

Popa³

2018

Rev. Chim.

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The compounds in Ginger (Zingiber officinale-Roscoe) essential oil provenience China and wild oregano (Origanum vulgare) essential oil of Romanian origin were identified by GC/MS and their antioxidant and antifungal properties were evaluated. Wild oregano oil was characterized by high content of oxygenated monoterpenes hydrocarbons (84.05%) of which carvacrol was the most abundant (73.85%) followed by b-linalool (3.46%) and thymol (2.29%). Ginger oil had a higher content of sesquiterpene hydrocarbons including zingiberene (31.47%), b-sesquiphellandrene (13.76%), a-curcumene (10.41%), a-farnesene (8.31%) and b-bisabolene (7.55%) but a lower content of oxygenated monoterpenes (7.97%). The high content of oxygenated monoterpens of wild oregano oil is in accordance with total content of polyphenols determined by the Folin�Ciocalteu method (6.71�0.73 mg of gallic acid equivalent per g oil). Ginger oil had only 1.34�0.22 mg gallic acid equivalent per g oil. Wild oregano oils exhibited appreciable in vitro antioxidant activity as assessed by 2, 2`-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and 2,2�-azino-bis (3 ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS). The sample concentration required to scavenge 50% of the DPPH free radicals was 0.76�0.13 mg/mL for wild oregano oil compared to 20.22�2.12 mg/mL for ginger oil. Also, wild oregano oils showed significant inhibitory activity against selected pathogenic fungi (Fusarium oxysporum, Aspergillus flavus and Penicillium expansum). 1�L of oregano oil is sufficient for almost 75% growth inhibition of Aspergillus flavus compared to ginger oil which shows antifungal activity at 240�L for 78% growth inhibition. It can be concluded that wild oregano oil could be used as food preservative in some food products in which Fusarium oxysporum, Aspergillus flavus and Penicillium expansum could grow and have potential to produce health hazards mycotoxines.

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“…Pseudomonas is another widely distributed genus closely associated with plants, both as endophytes or in the rhizosphere (Duijff et al 1997;Ryan et al 2008), and even with a biological control potential against F. oxysporum strains (Kejela et al 2017). In our study, we selected only five Pseudomonas isolates within the group of 24 isolates with higher biopesticide activity.…”

Section: Discussionmentioning

confidence: 99%

Antagonist capacity of bacteria isolated from cape gooseberry cultures (Physalis peruviana L.) for biological control of Fusarium oxysporum

Toloza-Moreno

Lizarazo-Forero

Uribe-Vélez

2020

Trop. plant pathol.

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Vascular wilt caused by Fusarium oxysporum is the most damaging disease in cape gooseberry (Physalis peruviana L.) production. In this study, we isolated and biochemically characterized endophytes and rhizospheric bacterial isolates with antagonistic activity against F. oxysporum from cape gooseberry plants. Bacterial isolates were evaluated under in vitro conditions for their antagonistic capacity against a highly virulent isolate of F. oxysporum, as well as production of lytic enzymes, biosurfactants and volatile organic compounds. Twenty-four antagonistic bacteria were selected, out of which Bacillus sp. MB015 and Pseudomonas sp. MB108 exhibited the best biocontrol activity in vitro, with inhibition levels of 80.6% and 79.9%, respectively. However, under greenhouse conditions, P. fluorescens MB103 and B. megaterium MB112 presented the best antagonistic capacity with 83.3% control of vascular wilt incidence. P. fluorescens MB103 was one of most effective in reducing the disease severity with an area under the disease of progress curve (AUDPC) of 7.5, compared with the negative control (soil infested with Fox17 without test bacteria), which presented an AUDPC of 36.8. These results suggest that P. fluorescens MB103 is a good candidate for use as a biocontrol agent against vascular wilt caused by F. oxysporum in cape gooseberry under field conditions.

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A novel strain of Pseudomonas inhibits Colletotrichum gloeosporioides and Fusarium oxysporum infections and promotes germination of coffee

Cited by 16 publications

References 44 publications

Root exudates from citrus plants subjected to abiotic stress conditions have a positive effect on rhizobacteria

Root exudates from citrus plants subjected to abiotic stress conditions have a positive effect on rhizobacteria

Chemical Composition and Active Properties Evaluation of Wild Oregano (Origanum Vulgare) and Ginger (Zingiber Officinale-Roscoe) Essential Oils

Antagonist capacity of bacteria isolated from cape gooseberry cultures (Physalis peruviana L.) for biological control of Fusarium oxysporum

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