Infection strategies of plant parasitic fungi

Struck, Christine

doi:10.1007/1-4020-4581-6_4

Cited by 12 publications

(7 citation statements)

References 109 publications

(115 reference statements)

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“…The nature of adhesion of Quambalaria spores to the leaf and stem surface is unknown but it is likely that a mucilaginous coating is activated in the presence of moisture. Adequate moisture during the infection process is important for the hydration of fungal propagules leading to a rapid release of mucilage to aid in adhesion to a variety of substrates as described by Struck (2006) for the rust Uromyces fabae . The composition of this mucilaginous product is unknown for Quambalaria spp.…”

Section: Discussionmentioning

confidence: 99%

Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

et al. 2009

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Quambalaria spp. are eucalypt leaf and shoot pathogens of growing global importance, yet virtually nothing is known regarding the manner in which they infect and colonize their hosts. A study of the infection process of Q. pitereka and Q. eucalypti on Corymbia and Eucalyptus species was thus undertaken using light, scanning and transmission electron microscopy after artificial inoculation. Conidial germination was triggered when relative humidity levels exceeded 90% and commenced within 2 h in the presence of free water. Light reduced germination but did not prevent germination from occurring. Conidial germination and hyphal growth occurred on the upper and lower leaf surfaces with penetration occurring via the stomata or wounds on the leaf surface or juvenile stems. There was no evidence of direct penetration of the host. Following penetration through the stomata, Q. pitereka and Q. eucalypti hyphae grew only intercellularly without the formation of haustoria or interaction apparatus, which is characteristic of the order Microstromatales. Instead, the presence of an interaction zone is demonstrated in this paper. Conidiophores arose through stomatal openings producing conidia 7 days after infection.

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Section: Discussionmentioning

confidence: 99%

Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

et al. 2009

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“…Aspergillus welwitschiae ’s strategies for infection in Agave sisalana resemble in many forms that of necrotrophic phytopathogenic fungi. It attacks damaged plants [19], possesses a broad host range [20], and contains a large arsenal of carbohydrate degrading enzymes [21]. However, necrotrophs also rely on the heavy production of toxins in order to induce cell death and make nutrients available for the fungus [22].…”

Section: Discussionmentioning

confidence: 99%

Calm Before the Storm: A Glimpse into the Secondary Metabolism of Aspergillus welwitschiae, the Etiologic Agent of the Sisal Bole Rot

Quintanilha-Peixoto

Torres

Reis

et al. 2019

Toxins

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Aspergillus welwitschiae is a species of the Nigri section of the genus Aspergillus. In nature, it is usually a saprotroph, decomposing plant material. However, it causes the bole rot disease of Agave sisalana (sisal), a plant species used for the extraction of hard natural fibers, causing great economic loss to this culture. In this study, we isolated and sequenced one genome of A. welwitschiae (isolate CCMB 674 (Collection of Cultures of Microorganisms of Bahia)) from the stem tissues of sisal and performed in silico and wet lab experimental strategies to describe its ability to produce mycotoxins. CCMB 674 possesses 64 secondary metabolite gene clusters (SMGCs) and, under normal conditions, it produces secondary metabolism compounds that could disturb the cellular cycle of sisal or induce abnormalities in plant growth, such as malformin C. This isolate also produces a pigment that might explain the characteristic red color of the affected tissues. Additionally, this isolate is defective for the production of fumonisin B1, and, despite bearing the full cluster for the synthesis of this compound, it did not produce ochratoxin A. Altogether, these results provide new information on possible strategies used by the fungi during the sisal bole rot, helping to better understand this disease and how to control it.

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“…Consequently, a close metabolic interaction between the host plant and the biotrophic pathogen is established and the fungus aims to block host defences to sustain the host processes it requires for feeding and growth (Giraldo et al 2013; Yi and Valent 2013). Hemibiotrophic pathogens are intermediate between the necrotrophic and the biotrophic lifestyles, initially growing as biotrophs and later switching to a necrotrophic lifestyle (Struck 2006; Gardiner, Kazan and Manners 2013). The biotroph–necrotroph switch in hemibiotrophs depends on molecular and physiological factors.…”

Section: Diversity and Evolution Of Plant–fungal Interactions—from Symentioning

confidence: 99%

Friends or foes? Emerging insights from fungal interactions with plants

Zeilinger

Gupta

Dahms

et al. 2015

FEMS Microbiology Reviews

282

151

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Fungi interact with plants in various ways, with each interaction giving rise to different alterations in both partners. While fungal pathogens have detrimental effects on plant physiology, mutualistic fungi augment host defence responses to pathogens and/or improve plant nutrient uptake. Tropic growth towards plant roots or stomata, mediated by chemical and topographical signals, has been described for several fungi, with evidence of species-specific signals and sensing mechanisms. Fungal partners secrete bioactive molecules such as small peptide effectors, enzymes and secondary metabolites which facilitate colonization and contribute to both symbiotic and pathogenic relationships. There has been tremendous advancement in fungal molecular biology, omics sciences and microscopy in recent years, opening up new possibilities for the identification of key molecular mechanisms in plant–fungal interactions, the power of which is often borne out in their combination. Our fragmentary knowledge on the interactions between plants and fungi must be made whole to understand the potential of fungi in preventing plant diseases, improving plant productivity and understanding ecosystem stability. Here, we review innovative methods and the associated new insights into plant–fungal interactions.

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Infection strategies of plant parasitic fungi

Cited by 12 publications

References 109 publications

Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

Infection and disease development of Quambalaria spp. on Corymbia and Eucalyptus species

Calm Before the Storm: A Glimpse into the Secondary Metabolism of Aspergillus welwitschiae, the Etiologic Agent of the Sisal Bole Rot

Friends or foes? Emerging insights from fungal interactions with plants

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