Chapter 38 : Genetics and Pathogenicity

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Genetics and Pathogenicity, Page 1 of 2

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Various members of the genus are associated with plant diseases and the production of various classes of mycotoxins, with many secondary metabolites still only poorly characterized. The conditionally dispensable chromosome of appears to contain many pea pathogenicity genes that are important for host range determinants but are dispensable for normal growth in culture. Several well-conserved signal transduction pathways have been studied in some species. Mitogen-activated protein kinase (MAPK) genes homologous to the PMK1 have been characterized in (FMK1) and (GPMK1/MAK1). All of the sequenced genomes contain multiple copies of genes encoding cutinases, xylanases, polygalacturonases (PG), and other cell wall-degrading enzyme (CWDE) genes, indicating the importance of these hydrolytic enzymes. head scab has been linked to deoxynivalenol (DON) in two ways. First there were mechanistic studies conducted by researchers showing that strains that produced more DON were more aggressive than strains that produced nivalenol as an alternative to DON or that produced no trichothecenes whatsoever. Second, in a quantitative trait locus analysis, another group of researchers showed that the cluster of genes responsible for trichothecene biosynthesis was at the heart of the only major quantitative trait locus in a cross between fungal strains that differed in their ability to cause fusarium head scab. Genetics- and genomics-based approaches will certainly further improve our understanding of molecular mechanisms and evolution of pathogenesis.

Citation: Leslie J, Xu J. 2010. Genetics and Pathogenicity, p 607-621. In Borkovich K, Ebbole D (ed), Cellular and Molecular Biology of Filamentous Fungi. ASM Press, Washington, DC. doi: 10.1128/9781555816636.ch38

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Single Nucleotide Polymorphism Analysis
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Image of FIGURE 1

Spore morphology characters used in the identification of species. Drawings are idealized and not necessarily to scale. (A through D) Macroconidial shapes. (A) Typical macroconidium; the apical cell is on the left, and the basal cell is on the right; (B) slender, straight, almost needle-like macroconidium, e.g., ; (C) macroconidium with dorsoventral curvature, e.g., ; (D) macroconidium with the dorsal side more curved than the ventral, e.g., . (E through H) Macroconidial apical cell shapes; (E) blunt, e.g., ; (F) papillate, e.g., ; (G) hooked, e.g., ; (H) tapering, e.g., . (I through L) Macroconidial basal cell shapes; (I) Foot shaped, e.g., ; (J) elongated foot shape, e.g., ; (K) distinctly notched, e.g., ; (L) barely notched, e.g., . (M through T) Microconidial spore shapes; (M) oval; (N) two-celled oval; (O) three-celled oval; (P) reniform; (Q) obovoid with a truncate base; (R) pyriform; (S) napiform; (T) globose. (U through X) Phialide morphology; (U) monophialides, e.g., (V) monophialides, e.g., ; (W) Polyphialides, e.g., ; (X) polyphialides, e.g., . (Y and Z) Microconidial chains; (Y) short chains, e.g., ; (Z) long chains, e.g., . (After .)

Citation: Leslie J, Xu J. 2010. Genetics and Pathogenicity, p 607-621. In Borkovich K, Ebbole D (ed), Cellular and Molecular Biology of Filamentous Fungi. ASM Press, Washington, DC. doi: 10.1128/9781555816636.ch38
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Image of FIGURE 2

Perithecia, asci, and ascospores of , and . (A) Cluster of perithecia of on wheat straw; bar = 200 μm. (B) Perithecia of on carnation leaf pieces from CLA; bar = 200 μm. (C) Perithecium of oozing ascospores in a cirrhus; bar = 200 μm. (D) Perithecium of oozing ascospores in a cirrhus; bar = 200 μm. (E) Asci and ascospores of , note three-septate ascospores; bar = 25 μm. (F) Asci and ascospores of ; bar = 25 μm. (G) Ascospores of , note one-septate ascospores; bar = 10 μm. (H) Ascospores of ; bar = 10 μm. (After .)

Citation: Leslie J, Xu J. 2010. Genetics and Pathogenicity, p 607-621. In Borkovich K, Ebbole D (ed), Cellular and Molecular Biology of Filamentous Fungi. ASM Press, Washington, DC. doi: 10.1128/9781555816636.ch38
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Image of FIGURE 3

Chlamydospores of species. (A and B) Single, verrucose chlamydospores of ; (C and D) clustered chlamydospores of ; (E) chain of verrucose chlamydospores of ; (F) paired, smooth-walled chlamydospores of ; (G) single, verrucose chlamydospore of . ; (H) paired, verrucose chlamydospores of ; (I) clustered, smooth-walled chlamydospores of ; (J and L) chains of verrucose chlamydospores of ; (K) chain of verrucose chlamydospores of . Scale bars: panels A through E, 50 μm; panels F through L, 25 μm. (After .)

Citation: Leslie J, Xu J. 2010. Genetics and Pathogenicity, p 607-621. In Borkovich K, Ebbole D (ed), Cellular and Molecular Biology of Filamentous Fungi. ASM Press, Washington, DC. doi: 10.1128/9781555816636.ch38
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Genome characteristics of four sequenced species

Citation: Leslie J, Xu J. 2010. Genetics and Pathogenicity, p 607-621. In Borkovich K, Ebbole D (ed), Cellular and Molecular Biology of Filamentous Fungi. ASM Press, Washington, DC. doi: 10.1128/9781555816636.ch38
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Some of the best-known secondary metabolites produced by spp.

Citation: Leslie J, Xu J. 2010. Genetics and Pathogenicity, p 607-621. In Borkovich K, Ebbole D (ed), Cellular and Molecular Biology of Filamentous Fungi. ASM Press, Washington, DC. doi: 10.1128/9781555816636.ch38
Generic image for table

Some virulence factors characterized in species

Citation: Leslie J, Xu J. 2010. Genetics and Pathogenicity, p 607-621. In Borkovich K, Ebbole D (ed), Cellular and Molecular Biology of Filamentous Fungi. ASM Press, Washington, DC. doi: 10.1128/9781555816636.ch38

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