The Effect of Pseudomonas fluorescens and Fusarium oxysporum f.sp. cubense on Induction of Defense Enzymes and Phenolics in Banana

Thangavelu, R.; Palaniswami, A.; Doraiswamy, Sabitha; Velazhahan, R.

doi:10.1023/a:1022374520121

Cited by 53 publications

(23 citation statements)

References 34 publications

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“…P. aeruginosa (P07-1, 85A-2, 56K-3), B. amyloliquefaciens (76A-1), and B. cereus (B10a) resulted in increases of defense-related enzymes such as PoX and PPo in eggplants. Similar results were also obtained from the work of thangavelu et al (39) in that they reported a two-fold increase in phenolic content along with the increase of PAl (phenylalanine ammonia lyase), chitinase, β-1,3-glucanase and PoX in leaf tissues of banana three days after treatment with Psedomonas fluorescens strain Pf10 against Fusarium oxysporum f. sp. cubense.…”

Section: Induction Of Defense Enzymes In Eggplant Againstsupporting

confidence: 89%

Potential ofPseudomonasandBacillusIsolates as Biocontrol Agents Against Fusarium Wilt of Eggplant

Altınok

Dikilitaş

Yildiz³

2013

Biotechnology & Biotechnological Equipment

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Section: Induction Of Defense Enzymes In Eggplant Againstsupporting

confidence: 89%

Potential ofPseudomonasandBacillusIsolates as Biocontrol Agents Against Fusarium Wilt of Eggplant

Altınok

Dikilitaş

Yildiz³

2013

Biotechnology & Biotechnological Equipment

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“…The increase in lignin deposition and cell wallbound phenolic contents could enhance the ability of plants to defend against pathogen invasion (Nicholson & Hammerschmidt 1992). Cell wall-bound phenolic compounds are induced in banana and tomato to protect the plants from Fusarium wilt disease (Thangavelu et al 2003;Mandal & Mitra 2007).…”

Section: Discussionmentioning

confidence: 99%

“…1). The supernatant of extracts was collected and the concentration of soluble phenolics was estimated according to Thangavelu et al (2003), whereas the alcohol insoluble residues were dried in an oven and the concentration of cell wall-bound phenolics was analysed.…”

Section: Soluble Phenolic Compounds Extractmentioning

confidence: 99%

“…These solutions were labelled as cell wall-bound phenolic extracts, the supernatant of which was analysed for the cell wall-bound phenolics content. The protocol for the measurement of phenolics was modified from Thangavelu et al (2003). The 150-μl-extract solution was mixed with solutions of 750 μl sterile water and 37•5 μl 2 N Folin-Ciocalteau's phenol reagent (Sigma-Aldrich Inc., Stenheim, Germany).…”

Section: Cell Wall-bound Phenolics Extractmentioning

confidence: 99%

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Cell wall reinforcement in watermelon shoot base related to its resistance to Fusarium wilt caused by Fusarium oxysporum f. sp. niveum

et al. 2014

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SUMMARYFusarium wilt of watermelon, caused by Fusarium oxysporum f. sp. niveum, is one of the limiting factors for watermelon production in Taiwan. In recent research, the phenylalanine ammonia lyase (PAL) gene expressed in the shoot base of the Fusarium wilt resistant line JSB was related to Fusarium wilt resistance. Phenylalanine ammonia lyase is the key regulatory enzyme in the phenylpropanoid metabolic pathway. The downstream products of phenolic compounds are considered to be involved in the complicated plant defence mechanisms. They could act as signal molecules, antimicrobial substances and/or structural barriers. To study the resistant mechanisms of Fusarium wilt, the resistant JSB line was examined for comparison of F. oxysporum-watermelon interactions with the susceptible Grand Baby (GB) cultivar. Unlike infected GB, which was seriously colonized by F. oxysporum in the whole plant, the pathogen was limited below the shoot base of inoculated JSB, suggesting that the shoot base of JSB may contribute to Fusarium resistance. The data indicated that a significant increase in PAL activity was found in shoot bases of the resistant JSB line at 3, 9, 12 and 15 days after inoculation (DAI). Shoot bases of resistant watermelons accumulated higher amounts of soluble and cell wall-bound phenolics at 3–9 DAI; the susceptible GB cultivar, however, only increased the cell wall-bound phenolics in shoot bases at 3 DAI. High lignin deposition in the cell walls of vascular bundles was observed in the shoot bases of JSB but not of GB seedlings at 6 and 9 DAI. In the roots and shoot bases of JSB seedlings at 6 DAI, peroxidase enzyme activity increased significantly. In summary, the results suggest that accumulation of cell wall-bound phenolics and increase of peroxidase activity in shoot bases of JSB seedlings during F. oxysporum inoculation, together with the rapid deposition of lignin in the cell walls of vascular bundles, may have provided structural barriers in resistant JSB line to defend against F. oxysporum invasion.

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“…Pathogens can also cause large changes in plant tissue chemistry, which is a key regulator of plant effects on carbon and nutrient dynamics (Hobbie 1992; Hattenschwiler and Vitousek 2000;Fierer et al 2001). In many plants, infection by pathogens induces secondary compounds with strong antimicrobial properties, including lignin, tannins, gums, phenolics, alkaloids, isofl avanoids, terpenoids, and proteins with antimicrobial activity (e.g., thionins, chitinase) (Belanger et al 2003;Cao et al 2001;Daayf et al 2003;De Ascensao and Dubery 2000;Ishimoto et al 2004;Krischick et al 1991;Pegg and Ayres 1988;Ramamoorthy et al 2002;Saunders and O'Neill 2004;Thangavelu et al 2003;Thipyapong et al 2004;Witzell and Shevtsova 2004;reviewed in Agrios 2005). For example, pathogens have been shown to increase lignin concentrations by 26% in alfalfa (Medicago sativa) (Lenssen et al 1992), phenolics by 25%-200% in bilberry (Vaccinium myrtillus) (Witzell and Shevtsova 2004), and soluble phenolics by 30-fold in potato tubers (Solanum tuberosum) (Agrios 2005).…”

Section: Pathogens Alter Plant Traitsmentioning

confidence: 99%

Chapter Twelve. Effects of Pathogens on Terrestrial Ecosystem Function

Eviner¹,

Likens²

2010

Infectious Disease Ecology

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Many studies have demonstrated that pathogens can have strong effects on the per for mance of individual organisms, population dynamics, and community interactions. A more limited set of studies suggests that pathogens can alter a wide range of ecosystem functions in terrestrial systems; however, we are lacking a framework to predict the type and magnitude of ecosystem effects that a given pathogen will have. In this chapter, we present a number of general principles that determine how pathogens infl uence ecosystems over time, based on the welldeveloped fi elds of disturbance ecol ogy and the ecosystem effects of species composition. Our focus is not only on pathogens as disturbances but also as drivers of ecosystem pro cesses, even when their presence is not readily apparent.

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The Effect of Pseudomonas fluorescens and Fusarium oxysporum f.sp. cubense on Induction of Defense Enzymes and Phenolics in Banana

Cited by 53 publications

References 34 publications

Potential ofPseudomonasandBacillusIsolates as Biocontrol Agents Against Fusarium Wilt of Eggplant

Potential ofPseudomonasandBacillusIsolates as Biocontrol Agents Against Fusarium Wilt of Eggplant

Cell wall reinforcement in watermelon shoot base related to its resistance to Fusarium wilt caused by Fusarium oxysporum f. sp. niveum

Chapter Twelve. Effects of Pathogens on Terrestrial Ecosystem Function

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