Acidovorax avenae subsp. cattleyae causes bacterial brown spot disease on terrestrial orchid Habenaria lindleyana in Thailand

Khamtham, Jureerat; Akarapisan, Angsana

doi:10.1007/s42161-018-0135-6

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…ISR induced by an AM fungus in Medicago truncatula increases the defense response against Xanthomonas campestris (Liu et al, 2007), whereas Solanum lycopersicum has a similar response against Fusarium oxysporum (Wang et al, 2022a). Almost all types pathogens attack orchids, including bacteria (Keith et al, 2005;Suharjo et al, 2014;Khamtham and Akarapisan, 2019), fungi (Silva and Pereira, 2007;Lopes et al, 2009;Srivastava et al, 2018;Suwannarach et al, 2018), and viruses (Fogell et al, 2019;Tsai et al, 2022). Very little is known about ISR in orchids; to the best of our knowledge, only two studies have reported the occurrence of ISR and its role in alleviating soft rot (Wu et al, 2011;Ye et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Almost all types pathogens attack orchids, including bacteria (Keith et al ., 2005; Suharjo et al ., 2014; Khamtham and Akarapisan, 2019), fungi (Silva and Pereira, 2007; Lopes et al ., 2009; Srivastava et al ., 2018; Suwannarach et al ., 2018), and viruses (Fogell et al ., 2019; Tsai et al ., 2022). Very little is known about ISR in orchids; to the best of our knowledge, only two studies have reported the occurrence of ISR and its role in alleviating soft rot (Wu et al ., 2011; Ye et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

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Colonization by orchid mycorrhizal fungi primes induced systemic resistance against a necrotrophic pathogen

Pujasatria,

Miura,

Yamaguchi

et al. 2024

Preprint

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Orchids and arbuscular mycorrhiza (AM) plants evolved independently and have different structures and fungal partners, but they both facilitate nutrient uptake. Orchid mycorrhiza (OM) supports orchid seed germination, but unlike AM, its role in disease resistance of mature plants is largely unknown. Here, we examined whether OM induces systemic disease resistance against a necrotrophic pathogen in a similar fashion to AM. We investigated the priming effect of mycorrhizal fungi inoculation on resistance of a terrestrial orchid,Bletilla striata, to soft rot caused byDickeya fangzhongdai. We found that root colonization by a compatible OM fungus primedB. striataseedlings and induced systemic resistance against the infection. Transcriptome analysis showed that priming was mediated by the downregulation of jasmonate and ethylene pathways and that these pathways are upregulated once infection occurs. Comparison with the reported transcriptome of AM fungus–colonized rice leaves revealed similar mechanisms inB. striataand in rice. These findings highlight a novel aspect of commonality between OM and AM plants in terms of induced systemic resistance.HighlightColonization by a compatible mycorrhizal fungus primes induced systemic resistance against a necrotrophic pathogen in a terrestrial orchid,Bletilla striata, by regulating jasmonate and ethylene pathways, similar to arbuscular mycorrhizal plants.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Colonization by orchid mycorrhizal fungi primes induced systemic resistance against a necrotrophic pathogen

Pujasatria,

Miura,

Yamaguchi

et al. 2024

Preprint

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In vitro and in vivo antimicrobial activity of the fungal metabolite toluquinol against phytopathogenic bacteria

Chung,

Nguyen,

et al. 2023

Front. Microbiol.

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IntroductionBacterial plant diseases cause tremendous economic losses worldwide. However, a few effective and sustainable control methods are currently available. To discover novel and effective management approaches, we screened marine fungi for their antibacterial activity against phytopathogenic bacteria in vitro and in vivo.MethodsWe screened the culture broth of 55 fungal strains isolated from various marine sources (seawater, algae, and sediment) for their in vitro antibacterial activity using the broth microdilution method. Then, only the fungal strain (designated UL-Ce9) with higher antibacterial activity in vitro was tested in an in vivo experiment against tomato bacterial wilt. The active compounds of UL-Ce9 were extracted using ethyl acetate, purified by a series of chromatography, and the structure was elucidated by nuclear magnetic resonance spectroscopy. Pesticide formulations of toluquinol were prepared as soluble concentrates and wettable powder. The disease control efficacy of toluquinol formulations was evaluated against blight of rice and the bacterial wilt of tomato.Results and discussionThe culture broth of UL-Ce9 showed high antibacterial activity against Agrobacterium tumefaciens, Ralstonia solanacearum, and Xanthomonas arboricola pv. pruni in vitro, and we selected UL-Ce9 for the in vivo test. The UL-Ce9 culture broth completely suppressed the bacterial wilt of tomato at a dilution of 1:5. The phylogenetic analysis identified UL-Ce9 as Penicillium griseofulvum, and the antibacterial metabolites were revealed as patulin, gentisyl alcohol, and toluquinol, all of which were associated with the biosynthetic pathway of the mycotoxin patulin. Patulin exhibited the highest antibacterial activity against 16 phytopathogenic bacteria in vitro, followed by toluquinol and gentisyl alcohol. As patulin is toxic, we selected toluquinol to investigate its potential use as a pesticide against bacterial plant diseases. Compared with the chemicals currently being applied in agriculture (streptomycin and oxytetracycline), toluquinol formulations exhibited similar and higher control efficacies against bacterial leaf blight of rice and bacterial wilt of tomato, respectively. To the best of our knowledge, this is the first report of the antibacterial activity of toluquinol against phytopathogenic bacteria. Our results suggest that toluquinol is a potential candidate for the development of novel and effective pesticides for the management of bacterial plant diseases.

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Colonization by orchid mycorrhizal fungi primes induced systemic resistance against necrotrophic pathogen

Pujasatria,

Miura,

Yamaguchi

et al. 2024

Front. Plant Sci.

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Orchids and arbuscular mycorrhiza (AM) plants evolved independently and have different structures and fungal partners, but they both facilitate nutrient uptake. Orchid mycorrhiza (OM) supports orchid seed germination, but unlike AM, its role in disease resistance of mature plants is largely unknown. Here, we examined whether OM induces systemic disease resistance against a necrotrophic pathogen in a similar fashion to AM. We investigated the priming effect of mycorrhizal fungi inoculation on resistance of a terrestrial orchid, Bletilla striata, to soft rot caused by Dickeya fangzhongdai. We found that root colonization by a compatible OM fungus primed B. striata seedlings and induced systemic resistance against the infection. Transcriptome analysis showed that priming was mediated by the downregulation of jasmonate and ethylene pathways and that these pathways are upregulated once infection occurs. Comparison with the reported transcriptome of AM fungus–colonized rice leaves revealed similar mechanisms in B. striata and in rice. These findings highlight a novel aspect of commonality between OM and AM plants in terms of induced systemic resistance.

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Acidovorax avenae subsp. cattleyae causes bacterial brown spot disease on terrestrial orchid Habenaria lindleyana in Thailand

Cited by 4 publications

References 16 publications

Colonization by orchid mycorrhizal fungi primes induced systemic resistance against a necrotrophic pathogen

Colonization by orchid mycorrhizal fungi primes induced systemic resistance against a necrotrophic pathogen

In vitro and in vivo antimicrobial activity of the fungal metabolite toluquinol against phytopathogenic bacteria

Colonization by orchid mycorrhizal fungi primes induced systemic resistance against necrotrophic pathogen

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