Fungal Siderophores: Structure, Functions and Regulation

Das, Aparajita; Прасад, Рам; Srivastava, Abhishek; Giang, Pham Huong; Bhatnagar, Kamya; Varma, Ajit

doi:10.1007/978-3-540-71160-5_1

Cited by 39 publications

(29 citation statements)

References 99 publications

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“…To our knowledge, so far no report has been found on siderophore production in tested fungal species. Some Fusarium specieses produced fusarinin that includes hydroxymate with low affinity to iron, but this was not observed in phytopathogenic Fusarium (Das et al 2006).…”

Section: Discussionmentioning

confidence: 97%

Pyoverdine Production in Pseudomonas Fluorescens UTPF5 and its Association with Suppression of Common Bean Damping off Caused by Rhizoctonia Solani (Kühn)

Sharifi¹,

Ahmadzadeh²,

Sharifi-Tehrani³

et al. 2010

Journal of Plant Protection Research

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Abstract:Siderophore production is an important mechanism of biological control by a number of strains of plant growth-promoting rhizobacteria. Pseudomonas fluorescens UTPF5 was originally obtained from onion field. Biochemical and physiological characteristics of this strain refer to biovar 3 of P. fluorescens. Strain UTPF5 is an effective bacterium against several phytopathogenic fungi. Pyoverdine type siderophore of this strain was isolated using XAD amberlite column. The plant growth promotion and antifungal properties of bacteria were demonstrated under greenhouse conditions in combination with Fe-EDTA, Fe-EDDHA and Zn as modulators of pyoverdine production. Amendment with zinc, Fe-EDTA and Fe-EDDHA suppressed the disease inhibition when partially used with UTPF5. 7NSK 2 and its pyoverdine mutant, MPFM1, were used as reference strains the inhibition percent of which was not affect by soil amendment. Iron chelates, especially Fe-EDDHA, increased growth and chlorophyll production by plants. This effect was improved in the presence of bacterial strains. The siderophore mutant MPFM1 did not exhibit satisfactory disease inhibition and growth promotion activity. In vitro experiments showed that purified pyoverdine could decrease the fungal growth to the same extent as pyoverdine-producing strain.

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Section: Discussionmentioning

confidence: 97%

Pyoverdine Production in Pseudomonas Fluorescens UTPF5 and its Association with Suppression of Common Bean Damping off Caused by Rhizoctonia Solani (Kühn)

Sharifi¹,

Ahmadzadeh²,

Sharifi-Tehrani³

et al. 2010

Journal of Plant Protection Research

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“…This study and earlier reports (Vala et al 2000, Capon et al 2007) suggest that exploration of marine habitats could probably reveal novelty in siderophore structures and functions. Das et al (2007) reported that simultaneous production of organic acid by most fungi could be probably restricting the occurrence of catecholates in fungi due to instability of ferric catecholates at acidic pH. While lipophilicity, complex stability, high environmental pH and weak nitrogen metabolism are a few possible reasons for catecholate siderophores in bacteria, one of the possible reasons for occurrence of catecholate siderophores in E. nidulans could be the alkaline pH, as the pH of mangrove ecosystem from which Emericella nidulans was isolated was noted to be 8.2.…”

Section: Discussionmentioning

confidence: 99%

Production of Catecholate Siderophores by a Manglicolous fungus Emericella nidulans: A Novel Observation

Trivedi¹

2016

SIF

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Mangrove ecosystem is a rich source of manglicolous fungi. While much information is available on diversity of these fungi, their siderophores have not been explored yet. The present study was carried out with a view to explore siderophore production potential of manglicolous fungi along Ghogha Coast, Gulf of Khambhat, Gujarat, India. From four different mangrove samples viz. rhizosphere, rhizoplane, water and sediment, thirteen fungi belonging to Ascomycota were isolated, which were all siderophore producers. Their chemical characterization indicated siderophores of twelve fungi to be hydroxamates while one isolate Emericella nidulans exhibited a novel behaviour. Emericella nidulans a producer of both; hydroxamate and catecholate siderophore, a behaviour uncommon amongst fungi. The data revealed that exploring manglicolous fungi could reveal novelty in structural diversity of siderophore reflecting their unique ecological roles like avoiding siderophore piracy and oxidative stress for reclamation of mangrove associated coastal habitats.

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“…A capacidade de rizobactérias dos gêneros Kluyvera e Agrobacterium em produzir sideróforos já foi relatada por outros autores (Burd et al, 2000;Oger et al, 2001;Das et al, 2007). Já os resultados do efeito da produção dos sideróforos no crescimento dos três isolados de S. rolfsii evidenciam que a rizobactéria RR31223 teve maior capacidade de indisponibilizar ferro para o patógeno, pois houve supressão significativa do crescimento micelial dos três isolados de S. rolfsii, mesmo com suplementação por ferro (Tabela 4), concordando com os resultados descritos anteriormente.…”

Section: +unclassified

“…Isso pode ocorrer devido à capacidade de produção destas moléculas pelos isolados de S. rolfsii, assim como ocorre em outros fungos como Trichoderma, Fusarium e Aspergillus (Renshaw et al, 2002;Das et al, 2007). Por conseguinte, a eficiência de cada microrganismo em quelar íons ferro constitui fator TABELA 3 -Efeito de rizobactérias selecionadas para o controle da murcha-de-esclerócio, causada por Sclerotium rolfsii, no crescimento da parte aérea e radicular de plântulas de tomateiro em meio agar-água Médias seguidas com mesma letra não diferem entre si pelo teste Fisher-LSD a 5 %.…”

Section: +unclassified

Mecanismos de controle da murcha-de-esclerócio e promoção de crescimento em tomateiro mediados por rizobactérias

Pelzer

Halfeld-Vieira

Nechet

et al. 2011

Trop. plant pathol.

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RESUMOEste trabalho teve por objetivo caracterizar os possíveis mecanismos de antagonismo responsáveis pelo biocontrole da murchade-esclerócio e os fatores envolvidos na promoção de crescimento de tomateiro por rizobactérias selecionadas. As rizobactérias foram caracterizadas por meio da utilização de fontes de carbono, perfil de ácidos graxos e sequenciamento do 16S rDNA amplificado, enquanto os mecanismos de biocontrole e promoção do crescimento analisados através de indicadores bioquímicos e bioensaios. As rizobactérias agruparam-se com os gêneros Agrobacterium e Kluyvera. Os resultados indicam que a competição por ferro e antibiose são os possíveis mecanismos responsáveis pela capacidade de biocontrole da murcha-de-esclerócio exercida por essas rizobactérias, assim como a produção de auxinas e a fixação biológica de nitrogênio podem explicar a promoção do crescimento das plantas. Também foram demonstradas limitações do controle biológico, em função da capacidade de competição depender do isolado de Sclerotium rolfsii e, da antibiose, da composição nutricional do meio de crescimento. Palavras-chave: Athelia rolfsii, Sclerotium rolfsii, antibiose, auxinas, controle biológico, fixação biológica de nitrogênio, sideróforos. ABSTRACT Control mechanisms of southern blight and growth promotion on tomato mediated by rhizobacteriaThis study was conducted to elucidate the possible mechanisms responsible for the biocontrol of southern blight and the elements involved in tomato growth promotion by selected rhizobacteria. The rhizobacteria were characterized by carbon source utilization, fatty acid profiles, and 16S rDNA sequencing, while biocontrol mechanisms were investigated using biochemical indicators and bioassays. The rhizobacteria clustered within Agrobacterium and Kluyvera. The results indicated that iron competition and antibiosis are mechanisms that explain the biocontrol capability of southern blight by rhizobacteria. In the same way, auxin production and biological nitrogen fixation can explain growth promotion. Limitations of biological control were demonstrated because the competition capability is strain-specific for Sclerotium rolfsii, and antibiosis depends on the nutritional composition of growth media.

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Fungal Siderophores: Structure, Functions and Regulation

Cited by 39 publications

References 99 publications

Pyoverdine Production in Pseudomonas Fluorescens UTPF5 and its Association with Suppression of Common Bean Damping off Caused by Rhizoctonia Solani (Kühn)

Pyoverdine Production in Pseudomonas Fluorescens UTPF5 and its Association with Suppression of Common Bean Damping off Caused by Rhizoctonia Solani (Kühn)

Production of Catecholate Siderophores by a Manglicolous fungus Emericella nidulans: A Novel Observation

Mecanismos de controle da murcha-de-esclerócio e promoção de crescimento em tomateiro mediados por rizobactérias

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