Compatible Puccinia hordei infection in barley induces basal defense to subsequent infection by Blumeria graminis

Aghnoum, Reza; Niks, Rients E.

doi:10.1016/j.pmpp.2011.10.003

Cited by 6 publications

(6 citation statements)

References 35 publications

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“…For example, differences in disease onset resulted in temporal separation and stable coexistence between two related fungal pathogens of canola, Leptosphaeria maculans and L. biglobosa ( Toscano-Underwood et al, 2003 ). Niche specialization can reduce the severity of competition between pathogens permitting coexistence ( Fitt et al, 2006 ), although pathogens occupying various niches within a plant may interact indirectly by stimulating a common host defense response ( Aghnoum and Niks, 2012 ). Nevertheless, on an evolutionary timescale, competition may result in exclusion, enabling species to coexist when arriving at various times ( Fitt et al, 2006 ; Pfennig and Pfennig, 2009 ; Perefarres et al, 2014 ).…”

Section: Multi-pathogen Competitionmentioning

confidence: 99%

Host–Multi-Pathogen Warfare: Pathogen Interactions in Co-infected Plants

et al. 2017

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Studies of plant–pathogen interactions have historically focused on simple models of infection involving single host-single disease systems. However, plant infections often involve multiple species and/or genotypes and exhibit complexities not captured in single host-single disease systems. Here, we review recent insights into co-infection systems focusing on the dynamics of host-multi-pathogen interactions and the implications for host susceptibility/resistance. In co-infection systems, pathogen interactions include: (i) Competition, in which competing pathogens develop physical barriers or utilize toxins to exclude competitors from resource-dense niches; (ii) Cooperation, whereby pathogens beneficially interact, by providing mutual biochemical signals essential for pathogenesis, or through functional complementation via the exchange of resources necessary for survival; (iii) Coexistence, whereby pathogens can stably coexist through niche specialization. Furthermore, hosts are also able to, actively or passively, modulate niche competition through defense responses that target at least one pathogen. Typically, however, virulent pathogens subvert host defenses to facilitate infection, and responses elicited by one pathogen may be modified in the presence of another pathogen. Evidence also exists, albeit rare, of pathogens incorporating foreign genes that broaden niche adaptation and improve virulence. Throughout this review, we draw upon examples of co-infection systems from a range of pathogen types and identify outstanding questions for future innovation in disease control strategies.

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Section: Multi-pathogen Competitionmentioning

confidence: 99%

Host–Multi-Pathogen Warfare: Pathogen Interactions in Co-infected Plants

et al. 2017

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“…Priming of plant defenses which are induced in response to one pathogen and are effective against future attack by another pathogen has been suggested as a mechanism which inhibits subsequent pathogen growth (e.g., Lyngs Jørgensen et al, 1998 ; Lyngkjær and Carver, 2000 ; Aghnoum and Niks, 2012 ). Here, Bgt spores were able to infect and develop appressoria, haustoria, and ESH but were hindered in subsequent growth and reproductive ability at the later stages of fungal development.…”

Section: Discussionmentioning

confidence: 99%

“…Under controlled conditions, Lyngkjær and Carver (1999) found that an initial successful infection by a virulent isolate of B. graminis can render cells accessible to future attacks by other, normally avirulent isolates of this fungus but equally, inaccessibility to future infection could be induced if the initial attack failed. Aghnoum and Niks (2012) , investigating interactions between virulent P. hordei and B. graminis f.sp. hordei isolates on barley, found that pre-inoculation with the rust isolate induced increased resistance to both isolates of B. graminis by preventing haustorium formation.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Growth and Reproduction of the Biotrophic Fungus Blumeria graminis in the Presence of a Necrotrophic Pathogen

Orton

Brown

2016

Front. Plant Sci.

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Crops are attacked by many potential pathogens with differing life-history traits, which raises the question of whether or not the outcome of infection by one pathogen may be modulated by a change in the host environment brought on by infection by another pathogen. We investigated the host-mediated interaction between the biotroph Blumeria graminis f.sp. tritici (Bgt), the powdery mildew pathogen of wheat, and the necrotroph Zymoseptoria tritici, which has a long latent, endophytic phase following which it switches to a necrotrophic phase, resulting in the disease symptoms of Septoria tritici blotch. Both diseases are potentially severe in humid temperate climates and are controlled by fungicides and by growing wheat varieties with partial resistance. The compatible interaction between Z. tritici and the host reduced the number, size, and reproductive capacity of mildew colonies that a normally virulent Bgt isolate would produce but did not significantly alter the early development of Bgt on the leaf. The effect on virulent Bgt was elicited only by viable spores of Z. tritici. Notably, this effect was seen before the necrotic foliar symptoms induced by Z. tritici were visible, which implies there is a physiological interaction during the latent, endophytic period of Z. tritici, which either takes place directly between this fungus and Bgt or is mediated by the wheat leaf. Information on how different pathogens interact in host plants may allow plant breeders and others to improve the design of screening trials and selection of germplasm.

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“…In a similar experimental set‐up as in the sequential powdery mildew inoculation experiments, it was discovered that the colonization of barley leaves by a virulent rust fungus ( Puccinia hordei ) induces enhanced resistance against subsequent powdery mildew infection, exemplified by a reduction in haustorium formation. This effect was found to be local and independent of the virulence status of the powdery mildew challenger isolate (Aghnoum and Niks, ).…”

Section: Interactions Of Powdery Mildews With Other Foliar Pathogensmentioning

confidence: 96%

Mutual interplay between phytopathogenic powdery mildew fungi and other microorganisms

Panstruga

Kühn

2019

Molecular Plant Pathology

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Summary Powdery mildew is a common and widespread plant disease of considerable agronomic relevance. It is caused by obligate biotrophic fungal pathogens which, in most cases, epiphytically colonize aboveground plant tissues. The disease has been typically studied as a binary interaction of the fungal pathogen with its plant hosts, neglecting, for the most part, the mutual interplay with the wealth of other microorganisms residing in the phyllo‐ and/or rhizosphere and roots. However, the establishment of powdery mildew disease can be impacted by the presence/absence of host‐associated microbiota (epi‐ and endophytes) and, conversely, plant colonization by powdery mildew fungi might disturb indigenous microbial community structures. In addition, other (foliar) phytopathogens could interact with powdery mildews, and mycoparasites may affect the outcome of plant–powdery mildew interactions. In this review, we discuss the current knowledge regarding the intricate and multifaceted interplay of powdery mildew fungi, host plants and other microorganisms, and outline current gaps in our knowledge, thereby setting the basis for potential future research directions.

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Compatible Puccinia hordei infection in barley induces basal defense to subsequent infection by Blumeria graminis

Cited by 6 publications

References 35 publications

Host–Multi-Pathogen Warfare: Pathogen Interactions in Co-infected Plants

Host–Multi-Pathogen Warfare: Pathogen Interactions in Co-infected Plants

Reduction of Growth and Reproduction of the Biotrophic Fungus Blumeria graminis in the Presence of a Necrotrophic Pathogen

Mutual interplay between phytopathogenic powdery mildew fungi and other microorganisms

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