Pathogenicity of Race‐1 and Race‐2 Tomato Wilt Isolates of <i>Verticillium dahliae</i> from Different Geographical Origins

O'Garro, Leonard W.; Clarkson, John M.

doi:10.1111/j.1439-0434.1988.tb04481.x

Cited by 17 publications

(9 citation statements)

References 9 publications

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“…However, a limited colonization is observed in these cases. Little growth, restricted to the base of the vascular vessels in resistant accessions without symptom expression, has been observed (O'Garro & Clarkson 1988, Heinz et al 1998. A similar evidence was found in other pathosystems (Carrer Filho et al 2015).…”

Section: Resultssupporting

confidence: 61%

Selection of tomato accessions resistant to Verticilium wilt1

Filho

Oliveira

Dias

et al. 2016

Pesqui. Agropecu. Trop.

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Vascular wilting in tomato plants is an important disease caused by soil-inhabiting pathogens, especially Verticillium dahliae, which results in significant production losses. Control measures against this disease are difficult to implement due to intrinsic pathogen characteristics, such as high adaptability to the subterranean environment, in association with the host, and development of resistance structures that remain viable in the soil for long periods. The introgression of genes that express resistance is the main control measure and requires a continuous characterization program of resistant accessions. This study aimed at identifying tomato (Solanum lycopersicum) accessions resistant to V. dahlia, by using the phenotypic and genotypic methods. The reaction of 33 tomato accessions to different V. dahliae isolates was reinforced by molecular analysis, through markers linked to Ve resistance genes. The combination of bioassays and specific molecular markers showed a high correlation (94.3 %), with the selection of 25 accessions resistant to V. dahliae.

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Section: Resultssupporting

confidence: 61%

Selection of tomato accessions resistant to Verticilium wilt1

Filho

Oliveira

Dias

et al. 2016

Pesqui. Agropecu. Trop.

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“…The extent of stunting on tomato generally reflected the foliar symptoms; none of the race-2 isolates caused stunting of GCR-26, whereas they all caused significant stunting of GCR-218. Stunting has been used previously as an indication of disease severity (SCHAIBLE et al 1951), but more recent work has described this parameter an an unreliable indication of pathogenicity (BENDER andSHOEMAKER 1984, O'GARRO andCLARKSON 1988). However, tn this study, using these cultivars and an inoculation procedure that minimized root damage, race-1 and race-2 isolates could be distinguished on the basis of stunting.…”

Section: Discussionmentioning

confidence: 80%

Pathogenicity of Race‐1 and Race‐2 Tomato Wilt Isolates of Verticillium dabliae to Four Solanaceous and Two Non‐Solanaceous Hosts

Mingochi

Clarkson

1994

Journal of Phytopathology

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The pathogenicity of four race‐1 and three race‐2 tomato with isolates of Verticallium dahliae to tomato, eggplant, tobacco, pepper, French bean and cabbage was investigated. Plants were inoculated without wounding and the symptoms assessed 6, weeks later. Both race‐1 and race‐2 isolates caused foliar symptoms on the race‐1 susceptible tomato cultivar GCR‐26 (Ve/Ve) although these were generally more severe with race‐1. All race‐2 isolates were significantly more pathogenic than race‐1, on the race‐1 resistant tomato cultivar GCR‐218 (ve/ve), although two of the race‐1 isolates caused mild foliar symptoms. None of the race‐2 isolates caused stunting of GCR‐26 whereas they all caused significant stunting of GCR‐218. All isolates reduceddry weight on GCR‐26 whereas only race‐2 affected GCR‐218. All isolates induced significant foliar symptoms, stunting and reduction in dry weight on eggplant. Only one isolates (race‐1) caused foliar symptoms on tobacco but this was not accompanied by areduction in either plant height or dry weight. All isolates were able to cause foliar symptoms on pepper, and two caused moderate to severe symptoms. Four isolates caused a significant reduction in plant height and one of these reduced dry weight. One isolates which caused mild foliar symptoms on papper increased host dry weight. No disease symptoms were observed on the non‐solanaceous host French bean. All isolates were capable of inducing mild foliar symptoms on cabbage but none caused reductions ineither plant height or dry weight. Race‐1 and race‐2 isolates could only be distinguished on the near‐isogenic pair of tomato cultivars. Verticallium was re‐isolated for each fungal isolate/host cultivar combination for tomato, eggplant and tobacco but was sporadic for the other hosts.

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“…These data were not surprising, since the commercially grown tomatoes carry the Ve gene and are resistant to race 1. Although it has been reported that race 1 strains of Verticillium are able to colonize race 1-resistant cultivars (Blackhurst & Wood 1963, Grogan et al 1979, Bender & Shoemaker 1984, O'Garro & Clarkson 1988, and we have isolated V. dahliae race 1 from the roots and stems of race 1 -resistant varieties inoculated with high spore concentrations, it appears that in these cultivars race 1 isolates are typically confined to the roots and lower stem (G. Tenuta, unpublished). Our sampling method would therefore have favoured isolation of race 2 strains from field-grown plants.…”

Section: Resultsmentioning

confidence: 61%