The fine structure of developing microsclerotia of Verticillium dahliae Kleb.

Griffiths, D. A.

doi:10.1007/bf00408881

Cited by 43 publications

(38 citation statements)

References 11 publications

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“…There is ample evidence to suggest that the ability of chlamydospores to withstand adverse conditions is intimately associated with the presence of melanin materials in the spore cell wall, one of the functional roles attributed to melanin being its "role in conferring survivability upon certain microorganisms by protecting them against the effects of lytic enzymes re!eased in natural environments" (Sussman 1968). However, from the evidence presented in this paper, the process of melanization observed in developing spores of Humicola is similar to that seen in other fungi; Verticillium dahliae (Griffiths 1970), V. alboatrunz (Griffiths and Campbell 197 l), Fusarium oxysporum (Griffiths 1 9 7 3~)~ where the resulting structure is clearly concerned with survival of the organism under adverse conditions. Thus the role of perennation in relation to the aleuriospores of Humicola cannot be ruled out.…”

Section: Discussionsupporting

confidence: 74%

Development and structure of the aleuriospores of Humicola grisea Traaen

Griffiths¹

1974

Can. J. Microbiol.

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GRIFFITHS, D. A. 1974. Developn~ent and structure of the aleuriospores of Hunlicolagrisea Traaen. Can.J. Microbiol. 20: 55-58. Aleuriospores of H. grisea are bounded by a thick, single-layered cell wall differentiated into an outer, electron-dense melanized zone and an inner, hyaline zone. Melanization was initiated at the periphery of the cell wall and progressed inwards towards the cytoplasm. T o distinguish between chlamydospores and aleuriospores, the presence of a secondary cell wall in the former and the presence of a partially melanized, single-layered cell wall in the latter might prove a useful criterion in distinguishing between the two spore types. However, before such a distinction is made, similar studies on other aleuriosporeproducing species are necessary. GRIFFITHS, D. A. 1974. Development and structure of the aleuriospores of Hurrlicolngrisea Traaen. Can. J. Microbiol. 20: 55-58. Les aleuriospores de H . grisea sont limitkes par une paroi cellulaire Cpaisse, a couche unique, differienciee de I'intkrieur a I'extCrieur par une zone melanisee dense aux electrons et par une zone hyaline interne. La mClanisation est engendree dans la pkripherie de la paroi cellulaire et evolue de I'interieur, a travers le cytoplasme. La distinction entre les chlamydospores et les aleuriospores peut se faire en fonction de la presence d'une paroi secondaire chez les premieres et I'existence d'une couche unique partiellement melaniske chex les dernieres. Cependant, avant qu'une telle distinction puisse se faire, des etudes similaires chez d'autres especes produisant des aleuriospores seront nkcessaires.[Traduit par le journal]

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Section: Discussionsupporting

confidence: 74%

Development and structure of the aleuriospores of Humicola grisea Traaen

Griffiths¹

1974

Can. J. Microbiol.

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“…In addition, microsclerotia development can be induced in BM medium (Neumann and Dobinson, 2003). The morphology of V. dahliae microsclerotia has been studied with light and electron microscopy (Griffiths, 1970;Klimes et al, 2008;Perry and Evert, 1982;Xiong et al, 2014), which revealed that the microsclerotia were generated from swollen hyphal cells with high melanin concentrations. The mature microsclerotia consist of many melanized cells, and the peripheral microsclerotial cells were dead and devoid of cytoplasm (Griffiths, 1970).…”

Section: Discussionmentioning

confidence: 99%

“…The morphology of V. dahliae microsclerotia has been studied with light and electron microscopy (Griffiths, 1970;Klimes et al, 2008;Perry and Evert, 1982;Xiong et al, 2014), which revealed that the microsclerotia were generated from swollen hyphal cells with high melanin concentrations. The mature microsclerotia consist of many melanized cells, and the peripheral microsclerotial cells were dead and devoid of cytoplasm (Griffiths, 1970). In this study, the morphology and germination of mature microsclerotia were affected in DVdCrz1 strains, suggesting that VdCrz1 serves as an important transcriptional regulator of microsclerotia development and morphology.…”

Section: Discussionmentioning

confidence: 99%

VdCrz1 is involved in microsclerotia formation and required for full virulence in Verticillium dahliae

Xiong¹,

Wang²,

Tang³

et al. 2015

Fungal Genetics and Biology

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“…The function of these melaninlike granules in A. brasilense is unknown. In fungi and actinomycetes melanins are known to exist in structures that are extremely resistant to deleterious environmental conditions, such as spores and conidial and sclerotial walls (2,8,14,16,21,26,46). The melanized dark-pigmented fungi are reported to be particularly resistant to lysis by other microorganisms (2,8,14,21).…”

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confidence: 99%