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Abdelzaher, Hani M.A.; Elnaghy, Mohamed A.; Fadl-Allah, E. M.

doi:10.1023/a:1006836703594

Cited by 24 publications

(7 citation statements)

References 20 publications

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“…In particular, with regard to diseases caused by oomycetes, most of the diseases where P. oligandrum has a control effect are caused by P. ultimum , which causes diseases on a broad range of crop species ( Thambugala et al, 2020 ). E.g., P. oligandrum has been reported to control pre- and post-emergence damping-off of wheat caused by P. ultimum ( Abdelzaher et al, 1997 ). To our knowledge, there are no reports in the literature of antagonism of P. oligandrum toward P. myriotylum or to the control of diseases caused by P. myriotylum .…”

Section: Introductionmentioning

confidence: 99%

Dual-Transcriptomic, Microscopic, and Biocontrol Analyses of the Interaction Between the Bioeffector Pythium oligandrum and the Pythium Soft-Rot of Ginger Pathogen Pythium myriotylum

et al. 2021

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Biological control is a promising approach to suppress diseases caused by Pythium spp. such as Pythium soft rot of ginger caused by P. myriotylum. Unusually for a single genus, it also includes species that can antagonize Pythium plant pathogens, such as Pythium oligandrum. We investigated if a new isolate of P. oligandrum could antagonize P. myriotylum, what changes occurred in gene expression when P. oligandrum (antagonist) and P. myriotylum (host) interacted, and whether P. oligandrum could control soft-rot of ginger caused by P. myriotylum. An isolate of P. oligandrum, GAQ1, recovered from soil could antagonize P. myriotylum in a plate-based confrontation assay whereby P. myriotylum became non-viable. The loss of viability of P. myriotylum coupled with how P. oligandrum hyphae could coil around and penetrate the hyphae of P. myriotylum, indicated a predatory interaction. We investigated the transcriptional responses of P. myriotylum and P. oligandrum using dual-RNAseq at a stage in the confrontation where similar levels of total transcripts were measured from each species. As part of the transcriptional response of P. myriotylum to the presence of P. oligandrum, genes including a subset of putative Kazal-type protease inhibitors were strongly upregulated along with cellulases, elicitin-like proteins and genes involved in the repair of DNA double-strand breaks. In P. oligandrum, proteases, cellulases, and peroxidases featured prominently in the upregulated genes. The upregulation along with constitutive expression of P. oligandrum proteases appeared to be responded to by the upregulation of putative protease inhibitors from P. myriotylum, suggesting a P. myriotylum defensive strategy. Notwithstanding this P. myriotylum defensive strategy, P. oligandrum had a strong disease control effect on soft-rot of ginger caused by P. myriotylum. The newly isolated strain of P. oligandrum is a promising biocontrol agent for suppressing the soft-rot of ginger. The dual-RNAseq approach highlights responses of P. myriotylum that suggests features of a defensive strategy, and are perhaps another factor that may contribute to the variable success and durability of biological attempts to control diseases caused by Pythium spp.

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Section: Introductionmentioning

confidence: 99%

Dual-Transcriptomic, Microscopic, and Biocontrol Analyses of the Interaction Between the Bioeffector Pythium oligandrum and the Pythium Soft-Rot of Ginger Pathogen Pythium myriotylum

et al. 2021

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“…The first announcement of diseased wheat in Minia, Egypt was in 1997 when Abdelzaher and his co-workers reported damping-off of wheat caused by P. ultimum var. ultimum (Abdelzaher et al, 1997). They isolated P. ultimum var.…”

Section: Discussionmentioning

confidence: 99%

“…ultimum from the infected wheat plants while P. diclinum was only obtained from rhizosphere soil of the infected wheat seedlings. They also tested the pathogenicity of P. diclinum against wheat germinating seeds and seedlings and reported that P. diclinum was a non-pathogenic fungus (Abdelzaher et al, 1997). Our findings here revealed the occurrence of P. diclinum in a wheat field in Dear Attia village, Minia city, Egypt.…”

Section: Discussionmentioning

confidence: 99%

“…They are ubiquitous in soil and in water, distributed worldwide, and with very diverse host ranges. They include some of the most important and destructive plant pathogens, causing losses of seeds, pre-emergence and post-emergence damping-off, rots of seedlings, roots, or basal stalks, decays of fruits and vegetables during cultivation, storage, transit or at the market, and serious damages of a wide variety of crops in Egypt (Abdelzaher et al, 1997, Yu and Ma, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…Pythium was recognized as a major pathogen of wheat in several countries, affecting in reduction the yields by almost 30% (Cook and Haglund, 1982). In Egypt, no comprehensive studies are available concerning losses in wheat yield due to infection by Pythium despite reports of its frequent disconnection from Egyptian soils (Abdelzaher et al, 1997, Mazen et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Two pathogenic species of Pythium: P. aphanidermatum and P. diclinum from a wheat field

Al-Sheikh¹

2010

Saudi Journal of Biological Sciences

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During a survey of pathogenic and non-pathogenic Pythium spp. in different localities in Egypt, several isolates of Pythia were obtained and maintained on corn meal agar. Among these isolates, Pythium aphanidermatum and Pythium diclinum were obtained from rhizosphere of wheat plants grown in Dear Attia village, Minia, Egypt. Identification was made using morphological and molecular analyses. P. aphanidermatum and P. diclinum were able to cause reductions in emergence and adulating in wheat in laboratory scale. P. aphanidermatum appeared to be the most aggressive parasite under agar and pot experimental conditions.

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Biological control of plant pathogens: advantages and limitations seen through the case study of Pythium oligandrum

Gerbore

Benhamou

Vallance

et al. 2013

Environ Sci Pollut Res

120

109

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The management of certain plant beneficial microorganisms [biological control agents (BCAs)] seems to be a promising and environmental friendly method to control plant pathogens. However, applications are still limited because of the lack of consistency of BCAs when they are applied in the field. In the present paper, the advantages and limitations of BCAs are seen through the example of Pythium oligandrum, an oomycete that has received much attention in the last decade. The biological control exerted by P. oligandrum is the result of a complex process, which includes direct effects through the control of pathogens and/or indirect effects mediated by P. oligandrum, i.e. induction of resistance and growth promotion. P. oligandrum antagonism is a multifaceted and target fungus-dependent process. Interestingly, it does not seem to disrupt microflora biodiversity on the roots. P. oligandrum has an atypical relationship with the plant because it rapidly penetrates into the root tissues but it cannot stay alive in planta. After root colonisation, because of the elicitation by P. oligandrum of the plant-defence system, plants are protected from a range of pathogens. The management of BCAs, here P. oligandrum, is discussed with regard to its interactions with the incredibly complex agrosystems.

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Untitled

Cited by 24 publications

References 20 publications

Dual-Transcriptomic, Microscopic, and Biocontrol Analyses of the Interaction Between the Bioeffector Pythium oligandrum and the Pythium Soft-Rot of Ginger Pathogen Pythium myriotylum

Dual-Transcriptomic, Microscopic, and Biocontrol Analyses of the Interaction Between the Bioeffector Pythium oligandrum and the Pythium Soft-Rot of Ginger Pathogen Pythium myriotylum

Two pathogenic species of Pythium: P. aphanidermatum and P. diclinum from a wheat field

Biological control of plant pathogens: advantages and limitations seen through the case study of Pythium oligandrum

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