Occurrence and Dispersal of Verticillium Conidia in Xylem Sap of the Hop (Humulus lupulus L.)

Sewell, G. W. F.; Wilson, J. F.

doi:10.1038/204901a0

Cited by 24 publications

(12 citation statements)

References 5 publications

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“…by root inoculation they found that resistance was not localised in the root, and they conrlrmed this finding by stem inoculation. Sewell and Wilson (1964) concluded that the stems of wilt-tolerant hops were slightly more resistant than those of wiltsensitive ones, but the root was the determinative factor in the hop-wilt syndrome, as previously suggested by Keyworth (1953). Likewise Fronek (1965) grafted potato stems to show that resistance to Verticillium was present in the tops as well as the roots.…”

Section: Introductionsupporting

confidence: 49%

Verticillium wilt of tobacco

Gibbins

Wright²

1968

New Zealand Journal of Agricultural Research

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Tobacco root and stem systems were studied to determine their relative importance in resistance to Verticillium dahliae Kleb.Three cultivars, the most susceptible and resistant of which differed widely in resistance to the disease, were grafted so that the stems and roots were united in all possible combinations.The act of grafting lowered resistance in the more susceptible cultivars. The rootstocks of the most resistant cultivar marked Iv reduced symptoms in the susceptible scions grafted to them, and the stems of the resistant cultivar had more resistance than the stems of the susceptible ones.A method of estimating the amount of susceptibility of the different graft combinations at different periods of growth is described.The data most closely fitted a hypothetical model in which 74 percent of the resistance in all varieties at all stages of growth was contributed by the root system, the remainder corning from the stem.

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Section: Introductionsupporting

confidence: 49%

Verticillium wilt of tobacco

Gibbins

Wright²

1968

New Zealand Journal of Agricultural Research

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“…In the absence of a host, microsclerotia can remain viable for up to 14 years (165), whereas the survival of melanized mycelium of V. albo-atrum is limited to 2-5 years (81,139). Upon germination, microsclerotia produce one to several hyphae that extend toward host roots (52).…”

Section: A Novel Look At the Verticillium Disease Cyclementioning

confidence: 99%

Diversity, Pathogenicity, and Management of Verticillium Species

Klosterman

Atallah

Vallad

et al. 2009

Annu. Rev. Phytopathol.

648

564

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The genus Verticillium encompasses phytopathogenic species that cause vascular wilts of plants. In this review, we focus on Verticillium dahliae, placing emphasis on the controversy surrounding the elevation of a long-spored variant as a new species, recent advances in the analysis of compatible and incompatible interactions, highlighted by the use of strains expressing fluorescent proteins, and the genetic diversity among Verticillium spp. A synthesis of the approaches to explore genetic diversity, gene flow, and the potential for cryptic recombination is provided. Control of Verticillium wilt has relied on a panoply of chemical and nonchemical strategies, but is beset with environmental or site-specific efficacy problems. Host resistance remains the most logical choice, but is unavailable in most crops. The genetic basis of resistance to Verticillium wilt is unknown in most crops, as are the subcellular signaling mechanisms associated with Ve-mediated, race-specific resistance. Increased understanding in each of these areas promises to facilitate management of Verticillium wilts across a broad range of crops.

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“…Abundant formation of conidia, as has been described in other plants (Sewell and Wilson 1964;Garber and Houston 1966;Schnathorst et al 1967), was not observed. Sporulation was seen only occasionally in the petioles of mature plants of infected Virginia Gold.…”

Section: Main Experimentsmentioning

confidence: 59%

A histological study of the pathogenesis ofverticillium dahliaeKleb. in tobacco

Mahanty

1970

New Zealand Journal of Agricultural Research

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Histological observations of Verticillium dahliae Kleb. in tobacco are described. The pathogen did not invade the living tissues of the root tip or parenchyma cells of xylem.Systematic invasion of a resistant variety by the pathogen WcS reduced initially by gummosis and secondary proliferation by tylosis. In susceptible plants, although gummosis and tylosis were present, the mechanisms did not completely inhibit spore germination or migration of the pathogen.The number of infected areas in the mid-stem region was less in the resistant than in a susceptible variety. Such infected areas involved only one of two vessels laterally in the former, whereas 3-5 vessels were involved in the latter.Formation of microsclerotia and profuse secondary sporulation were rare. Morphological symptoms in the leaves were always associated with the presence of the fungus nearby.

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Occurrence and Dispersal of Verticillium Conidia in Xylem Sap of the Hop (Humulus lupulus L.)

Cited by 24 publications

References 5 publications

Verticillium wilt of tobacco

Verticillium wilt of tobacco

Diversity, Pathogenicity, and Management of Verticillium Species

A histological study of the pathogenesis ofverticillium dahliaeKleb. in tobacco

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