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A fissitunicate ascus mechanism in the Calosphaeriaceae, and novel species of Jattaea and Calosphaeria on Prunus wood.

Damm U, Crous PW, Fourie PH - Persoonia (2008)

Bottom Line: Possession of two separating wall layers is considered to be a result of both inherited abilities and convergent evolution under a strong selection pressure of the environmental conditions that favour an extension of the ascus.These findings suggest that some species of Jattaea are true members of the Calosphaeriaceae, though the phylogenetic relation of the type, J. algeriensis, remains unknown.Furthermore, it also represents the first report of Jattaea on Prunus wood, and from South Africa.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Pathology, University of Stellenbosch, Private Bag X1, Stellenbosch 7602, South Africa;

ABSTRACT
During a survey of Prunus wood from South Africa, isolations were made of three presumably Calosphaerialean fungi that formed hyphomycetous, phialidic anamorphs in culture. In order to reveal the phylogenetic relationship of these fungi, they were characterised on a morphological and molecular (LSU and ITS rDNA) basis. Two isolates that formed a teleomorph in culture are newly described as Calosphaeria africana sp. nov. Although asci of Calosphaeria are characterised by having non-amyloid apical rings, two functional wall layers were observed in asci of C. africana, which has hitherto not been observed in any member of the Calosphaeriaceae. However, Calosphaeriaceae (Calosphaeriales, Sordariomycetes) are not closely related to other bitunicate fungi like Dothideomycetes, Chaetothyriales and bitunicate lichens. Possession of two separating wall layers is considered to be a result of both inherited abilities and convergent evolution under a strong selection pressure of the environmental conditions that favour an extension of the ascus. The other two species represented a separate lineage within Calosphaeriaceae, and formed phialophora-like anamorphs. By obtaining the teleomorph in culture, one of them could be identified as a species of Jattaea, described here as Jattaea prunicola sp. nov., while the second, which only produced the anamorph, is named as Jattaea mookgoponga sp. nov. These findings suggest that some species of Jattaea are true members of the Calosphaeriaceae, though the phylogenetic relation of the type, J. algeriensis, remains unknown. Furthermore, it also represents the first report of Jattaea on Prunus wood, and from South Africa.

No MeSH data available.


Related in: MedlinePlus

Jattaea prunicola. a. Perithecium formed on SNA medium; b. peridium; c–f. asci with ascospores; g–h. apical region of asci in different developmental stages (arrow heads indicate apical rings); i. paraphyses; j. asci attached to ascogenous hyphae; k–m. ascogenous hyphae with ovoid to ellipsoidal cells; n–p. ascospores (arrow head indicates mucoid appendages); all from CBS H-19987 (holotype); a: DM, b, d–p: DIC, c: PC. — Scale bars: a = 50 μm; b–g, i–k, n = 5 μm; g applies to g & h; k applies to k–m; n applies to n–p.
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Figure 5: Jattaea prunicola. a. Perithecium formed on SNA medium; b. peridium; c–f. asci with ascospores; g–h. apical region of asci in different developmental stages (arrow heads indicate apical rings); i. paraphyses; j. asci attached to ascogenous hyphae; k–m. ascogenous hyphae with ovoid to ellipsoidal cells; n–p. ascospores (arrow head indicates mucoid appendages); all from CBS H-19987 (holotype); a: DM, b, d–p: DIC, c: PC. — Scale bars: a = 50 μm; b–g, i–k, n = 5 μm; g applies to g & h; k applies to k–m; n applies to n–p.

Mentions: Jattaea prunicola Damm & Crous, sp. nov. — MycoBank MB511429; Fig. 5, 6


A fissitunicate ascus mechanism in the Calosphaeriaceae, and novel species of Jattaea and Calosphaeria on Prunus wood.

Damm U, Crous PW, Fourie PH - Persoonia (2008)

Jattaea prunicola. a. Perithecium formed on SNA medium; b. peridium; c–f. asci with ascospores; g–h. apical region of asci in different developmental stages (arrow heads indicate apical rings); i. paraphyses; j. asci attached to ascogenous hyphae; k–m. ascogenous hyphae with ovoid to ellipsoidal cells; n–p. ascospores (arrow head indicates mucoid appendages); all from CBS H-19987 (holotype); a: DM, b, d–p: DIC, c: PC. — Scale bars: a = 50 μm; b–g, i–k, n = 5 μm; g applies to g & h; k applies to k–m; n applies to n–p.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2865353&req=5

Figure 5: Jattaea prunicola. a. Perithecium formed on SNA medium; b. peridium; c–f. asci with ascospores; g–h. apical region of asci in different developmental stages (arrow heads indicate apical rings); i. paraphyses; j. asci attached to ascogenous hyphae; k–m. ascogenous hyphae with ovoid to ellipsoidal cells; n–p. ascospores (arrow head indicates mucoid appendages); all from CBS H-19987 (holotype); a: DM, b, d–p: DIC, c: PC. — Scale bars: a = 50 μm; b–g, i–k, n = 5 μm; g applies to g & h; k applies to k–m; n applies to n–p.
Mentions: Jattaea prunicola Damm & Crous, sp. nov. — MycoBank MB511429; Fig. 5, 6

Bottom Line: Possession of two separating wall layers is considered to be a result of both inherited abilities and convergent evolution under a strong selection pressure of the environmental conditions that favour an extension of the ascus.These findings suggest that some species of Jattaea are true members of the Calosphaeriaceae, though the phylogenetic relation of the type, J. algeriensis, remains unknown.Furthermore, it also represents the first report of Jattaea on Prunus wood, and from South Africa.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Pathology, University of Stellenbosch, Private Bag X1, Stellenbosch 7602, South Africa;

ABSTRACT
During a survey of Prunus wood from South Africa, isolations were made of three presumably Calosphaerialean fungi that formed hyphomycetous, phialidic anamorphs in culture. In order to reveal the phylogenetic relationship of these fungi, they were characterised on a morphological and molecular (LSU and ITS rDNA) basis. Two isolates that formed a teleomorph in culture are newly described as Calosphaeria africana sp. nov. Although asci of Calosphaeria are characterised by having non-amyloid apical rings, two functional wall layers were observed in asci of C. africana, which has hitherto not been observed in any member of the Calosphaeriaceae. However, Calosphaeriaceae (Calosphaeriales, Sordariomycetes) are not closely related to other bitunicate fungi like Dothideomycetes, Chaetothyriales and bitunicate lichens. Possession of two separating wall layers is considered to be a result of both inherited abilities and convergent evolution under a strong selection pressure of the environmental conditions that favour an extension of the ascus. The other two species represented a separate lineage within Calosphaeriaceae, and formed phialophora-like anamorphs. By obtaining the teleomorph in culture, one of them could be identified as a species of Jattaea, described here as Jattaea prunicola sp. nov., while the second, which only produced the anamorph, is named as Jattaea mookgoponga sp. nov. These findings suggest that some species of Jattaea are true members of the Calosphaeriaceae, though the phylogenetic relation of the type, J. algeriensis, remains unknown. Furthermore, it also represents the first report of Jattaea on Prunus wood, and from South Africa.

No MeSH data available.


Related in: MedlinePlus