Die KartoffelnematodenGlobodera rostochienis (woll.) Behrens undG. pallida (Stone) Behrens und ihre Pathotypen in Schweden

Olsson, E. A.

doi:10.1007/bf02357528

Cited by 3 publications

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References 3 publications

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“…In the 1960s, cultivars carrying the H1 resistance gene were introduced into the starch potato district in southern Sweden. From about 1980 on-¤ Corresponding author, e-mail: sanja.manduric@vv.slu.se wards, populationsvirulent on cultivars with the H1 resistance gene were found in this district, belonging both to G. pallida and, to a lesser extent, to G. rostochiensis (Olsson, 1985). So far, pathotypes virulent to cultivars carrying H1 resistance gene have been found on about 70 farms as a result of very extensive surveys.…”

mentioning

confidence: 97%

Potato cyst nematodes (Globodera rostochiensis and G. pallida) from Swedish potato cultivation - an AFLP study of their genetic diversity and relationships to other European populations

Manduríc¹,

Andersson²

2003

Nematol

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Sixteen Swedish PCN populations (nine Globodera rostochiensis and seven G. pallida populations) were compared with 20 other European populations (nine G. rostochiensis and 11 G. pallida populations) from Germany, the Netherlands, Norway and the United Kingdom in an AFLP study. Seven AFLP primer combinations were used to amplify genomic DNAs extracted from cysts. A dendrogram, based on UPGMA and evaluated by bootstrap analysis, contained two main clusters, one for each species. The Swedish Ro1 populations were very similar to corresponding populations from other parts of Europe. Remaining G. rostochiensis populations appeared as a genetically heterogeneous group with two Swedish populations being most dissimilar. Within G. pallida there was strong support for differentiating Pa1 populations from Pa2/3 populations. All Swedish G. pallida populations were grouped in the Pa2/3 cluster, and there were indications that they might have two main European origins. On the whole, the study indicates that there is considerable heterogeneity in Swedish PCN populations, justifying the maintenance of effective phytosanitary regulations.

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confidence: 97%

Potato cyst nematodes (Globodera rostochiensis and G. pallida) from Swedish potato cultivation - an AFLP study of their genetic diversity and relationships to other European populations

Manduríc¹,

Andersson²

2003

Nematol

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“…Pa-a and b, on the other hand, differ from each other and so do Pa-d and e. Here again a quantitative pattern is observed, with pathotype-specific effects, that are not large enough to identify pathotypes reliably . Olsson (1985) reported the occurrence of pathotypes in Sweden . One population (SKI/80) was classified as Pa3, but on clone 62 .33 .3 it had a Pf/Pi ratio of 18 .0 nearly as high as on S .…”

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confidence: 99%

Pathotype-specificity in potato cyst nematodes, a reconsideration

Nijboer

Parlevliet

1990

Euphytica

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Within the two potato cyst nematode (PCN) species, Globodera rostochiensis and G.. pallida, eight pathotypes are presently discerned by seven differential Solanum clones, whereby resistance is defined as a Pf/Pi ratio < 1 .0, and susceptibility as a ratio above 1 .0 . This pathotyping is felt to be unsatisfactory . Reconsidering the original data and data published by others resulted in the conclusion that there are only three reliably recognizable Ro-pathotypes Rol/Ro4, Ro2/Ro3 and Ro5 . The differential clones 60 .21 .19 and, 65 .346 .19 differentiate only between the two species . Within G. pallida it does not seem possible to identify pathotypes reliably . The resistance-virulence pattern is of a quantitative nature fitting a polygenic system . There appear to be pathotype-specific, effects, which are not large enough to identify and classify pathotypes reliably . It is therefore suggested to rename the Ro-pathotypes into Rol (old Rol and Ro4), Ro3 (old Ro2 and Ro3) and Ro5 (old Ro5) and to speak of more and less virulent Pa-populations .The rigorous requirements for resistance in various countries present great problems to the breeders and result in the removal of much valuable partial resistance . Especially with G. pallida these rigorous requirements are probably an obstacle rather than an encouragement to solve the pallida problem .

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“…Particularly high ratios were observed for some populations on 62.33.3. Virulence of this level has not previously been noted in UK field populations, but ratios approaching those observed on susceptible controls have been recorded in Europe (Olsson, 1985) and m selected UK populations (Turner, 1990), Approximately one fifth of the Northern Ireland G. pallida populations tested showed a typical Pal response {P,jP, <\ on P55'7). The geographical distribution of these pure Pa I populations provided strong evidence of a distinct and limited Pal introduction some time in the past and supported the conclusions of Marks & Fleming (1985) who, in a hmited study ofisozyme variation amongst Northern Ireland G. pallida, found consistent differences between 1^1 and Pa3, All the Pal populations detected in the present study were located in a small area some 45 km in diameter and centred around the town of Portglenone.…”

Section: The Present Study Represents the Most Intensive Assessment Omentioning

confidence: 73%

Distribution and frequency of occurrence of potato cyst nematode pathotypes in Northern Ireland

1993

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The distribution and frequency of occurrence of potato cyst nematodes, Globodera rostochiensis and G. pallida, were examined in Northern Ireland. Globodera rostochiensis (pathotype Rol) was the most abundant species, while Pal and Pa3 pathotype reactions could be discerned within G. pallida. Unlike other parts of the UK, species proportions appear not to have changed over the last 20 years, probably as a result of the legislative control currently practised combined with the limited use of Rol‐resistant cultivars within the country. Differences in the geographical distributions of the three pathotypes were observed, and these are discussed in relation to original potato cyst nematode introductions and subsequent agricultural practices.

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Die KartoffelnematodenGlobodera rostochienis (woll.) Behrens undG. pallida (Stone) Behrens und ihre Pathotypen in Schweden

Cited by 3 publications

References 3 publications

Potato cyst nematodes (Globodera rostochiensis and G. pallida) from Swedish potato cultivation - an AFLP study of their genetic diversity and relationships to other European populations

Potato cyst nematodes (Globodera rostochiensis and G. pallida) from Swedish potato cultivation - an AFLP study of their genetic diversity and relationships to other European populations

Pathotype-specificity in potato cyst nematodes, a reconsideration

Distribution and frequency of occurrence of potato cyst nematode pathotypes in Northern Ireland

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