Biochemistry and Physiology of Pathogenesis

Pegg, G. F.

doi:10.1016/b978-0-12-464450-2.50012-7

Cited by 65 publications

(33 citation statements)

References 158 publications

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“…Systemic invasion occurs when a large number of conidia are produced and transported through the xylem to the aerial parts of the plants (Garas et al, 1986;Vallad and Subbarao, 2008). Resulting disease symptoms have been attributed to water stress caused by the occlusion of xylem vessels and the production of phytotoxins and ethylene (Buchner et al, 1982;Cronshaw and Pegg, 1976;Cooper and Durrands, 1989;DeVay, 1989;Pegg, 1981).…”

Section: Introductionmentioning

confidence: 98%

Roles of the catalytic subunit of cAMP-dependent protein kinase A in virulence and development of the soilborne plant pathogen Verticillium dahliae

Tzima

Paplomatas

Rauyaree

et al. 2010

Fungal Genetics and Biology

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Section: Introductionmentioning

confidence: 98%

Roles of the catalytic subunit of cAMP-dependent protein kinase A in virulence and development of the soilborne plant pathogen Verticillium dahliae

Tzima

Paplomatas

Rauyaree

et al. 2010

Fungal Genetics and Biology

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“…The possible SONJA L. "CENTER AND P.J. STEYN involvement of fusaric acid, a non-specific toxin, in disease development has been reviewed by Pegg (1981). The aim of this study was to determine the role of fusaric acid in the development of potato dry rot caused by Fusarium oxysporum.…”

Section: Introductionmentioning

confidence: 98%

Correlation between fusaric acid production and virulence of isolates ofFusarium oxysporum that causes potato dry rot in South Africa

Venter

Steyn

1998

Potato Res

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“…After germination of microsclerotia, which is inducible by the root exudates of host plants (Mol and Scholte 1995), the fungal hyphae reach the root surface, penetrate the epidermal cells, transverse the root cortex and enter the immature xylem elements (Beckman 1987). Most of the time of its life cycle V. dahliae is constricted to the vascular system, which is a nutrient-limited environment containing low amounts of sugars, inorganic salts, and amino acids, to which the fungus is well adapted (Wood 1961;Dimond 1970;Dixon and Pegg 1972;Green 1981;Pegg 1981Pegg , 1985Van Alfen 1989). In this liquid environment V. dahliae exhibits both hyphal and a 'yeast-like' growth, producing conidia budding directly from hyphae, or formed on short phialides (Buckley et al 1969).…”

Section: Introductionmentioning

confidence: 99%

Differential interactions of Verticillium longisporum and V. dahliae with Brassica napus detected with molecular and histological techniques

et al. 2007

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The differential interactions of V. longisporum (VL) and V. dahliae (VD) on the root surface and in the root and shoot vascular system of Brassica napus were studied by confocal laser scanning microscopy (CLSM), using GFP tagging and conventional fluorescence dyes, acid fuchsin and acridin orange. VL and VD transformants expressing sGFP were generated by Agrobacterium-mediated transformation. GFP signals were less homogenous and GFP tagging performed less satisfactory than the conventional fluorescence staining when both were studied with CLSM. Interactions of both pathogens were largely restricted to the root hair zone. At 24 h post-inoculation (hpi), hyphae of VL and VD were found intensely interwoven with the root hairs. Hyphae of VL followed the root hairs towards the root surface. At 36 hpi, VL hyphae started to cover the roots with a hyphal net strictly following the grooves of the junctions of the epidermal cells. VL started to penetrate the root epidermal cells without any conspicuous infection structures. Subsequently, hyphae grew intracellularly and intercellularly through the root cortex towards the central cylinder, without inducing any visible plant responses. Colonisation of the xylem vessels in the shoot with VL was restricted to individual vessels entirely filled with mycelium and conidia, while adjacent vessels remained completely unaffected. This may explain why no wilt symptoms occur in B. napus infected with VL. Elevated amounts of fungal DNA were detectable in the hypocotyls 14 days post-inoculation (dpi) and in the leaves 35 dpi. Root penetration was also observed for VD, however, with no directed root surface growth and mainly an intercellular invasion of the root tissue. In contrast to VL, VD started ample formation of conidia on the roots, and was unable to spread systemically into the shoots. VD did not form microsclerotia in the root tissue as widely observed for VL. This study confirms that VD is non-pathogenic on B. napus and demonstrates that non-host resistance against this fungus materializes in restriction of systemic spread rather than inhibition of penetration.

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Biochemistry and Physiology of Pathogenesis

Cited by 65 publications

References 158 publications

Roles of the catalytic subunit of cAMP-dependent protein kinase A in virulence and development of the soilborne plant pathogen Verticillium dahliae

Roles of the catalytic subunit of cAMP-dependent protein kinase A in virulence and development of the soilborne plant pathogen Verticillium dahliae

Correlation between fusaric acid production and virulence of isolates ofFusarium oxysporum that causes potato dry rot in South Africa

Differential interactions of Verticillium longisporum and V. dahliae with Brassica napus detected with molecular and histological techniques

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