Identification of pathogenic races of Phytophthora fragariae Hickman in Germany

Scheewe, P.

doi:10.1007/978-94-011-0467-8_14

Cited by 5 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They found Perle to have the same resistance pattern as cvs Sparkle, Climax Reid, 1952Scott etal., 1984Scott et al, 1984Reid, 1952Scott et al, 1984 Resistance to Phytophthora fragariae and Redgauntlet, although Perle's resistance had been convincingly discerned in earlier work (Hickman and English, 1951;Converse and Scott, 1962;Hickman, 1962) as well as in recent research (Scheewe, 1994) as in the present data (Table 1). Apparently, Milholland et al used a genotype that was not Perle.…”

Section: Siletz-a6supporting

confidence: 60%

Assessment of the Resistance to Phytophthora fragariae var. fragariae of the USA and Canadian Differential Series of Strawberry Genotypes

Weg

Henken

Giezen

1997

Journal of Phytopathology

View full text Add to dashboard Cite

The resistance of the USA and Canadian differential series of strawberry {Fragaria sp.) genotypes was assessed against nine USA isolates (A1-A4, A6-A10) and three Canadian isolates (NS2-NS4) of Phytophthora fragariae var. Jragariae. The resistance of part of the UK series was also examined. Of the 157 host genotype-isolate combinations tested, 13 were classified differently from earlier reports. These differences can be explained by the existence of diiferent clones under the same cultivar name (Aberdeen and Perle de Prague), the substitution of Aberdeen by Sparkle, which differ in their resistance, and by the apphcation of different criteria for resistance. Here, incomplete resistance was considered as resistance. The discernment of the US differential series can be improved by including the UK differential Perle de Prague and the Canadian differential Sparkle. The Canadian series can be improved by including Perle de Prague and the US differential Aberdeen. This leads to one unified differential set for North America.The results also allow the proposition of a formal gene-for-gene model which, in turn, provides for a universal differential series for this pathosystem. Zusammenfassung Erfassung der Resistenz des US-amerikanischen and des kanadischen Differentialsortiments von Erdbeer-Genotypen gegenPhytophthora fragariae var, fragariae Die Resistenz des US-amerikanischen und des kanadischen Differentialsortiments von Genotypen der Erdbeere (Fragaria spp.) wurde mit neun US-amerikanischen (A1-A4, A6~A10) und drei kanadischen (NS2-NS4) Isolaten von Phytophthora fragariae vsiT, fragariae geprtift. Zudem wurde ein Teil des britischen Differentialsortiments getestet. 13 der 157 geprtlften Genotyp-Isolat-Kombinationen fuhrten zu anderen Ergebnissen als in fruheren Arbeiten. Mogliche Ursachen fur diese Unterschiede sind die Existenz verschiedener Klone unter gleichem Sortennameti (Aberdeen und Perle de Prague), der Ersatz von Aberdeen durch den unterschiedlich resistenten Genotyp Sparkle und die Anwendung verschiedener Kriterien zur Beurteilung der Resistenz. Hier wurde unvollstatidige Resistenz als Resistetiz betrachtet. Der Wert des US-amerikanischen Differentialsortiments kann durch die Aufnahme des britischen Differentialgenotyps Perle de Prague und des kanadischen Differentialgenotyps Sparkle verbessert werden. Die kanadische Reihe laBt sich durch den EinschluB von Perle de Prague und des US-amerikanischen Differentialgenotyps Aberdeen aufwerten. Dadurch wurde ein fur Nordamerika einheitliches Sortiment entstehen.Die Ergebnisse ermoglichen die Erarbeitung eines formeilen Gen-fur-Gen-Modeils, das bei diesem Pathosystem die Verwendung eines weltweit einheitlichen Differentialsortiments nahelegt.

show abstract

Section: Siletz-a6supporting

confidence: 60%

Assessment of the Resistance to Phytophthora fragariae var. fragariae of the USA and Canadian Differential Series of Strawberry Genotypes

Weg

Henken

Giezen

1997

Journal of Phytopathology

View full text Add to dashboard Cite

show abstract

“…Phytophthora pseudosyringae is known to cause root and collar rot in deciduous trees [ 112 ]. Phytophthora fragariae is a root pathogen that causes red stele disease in strawberries [ 113 , 114 ], but in the present study, it was associated with the soil and roots of A. glutinosa, and with the roots of B. pendula ( Table 4 ).…”

Section: Discussionmentioning

confidence: 61%

DNA-Metabarcoding of Belowground Fungal Communities in Bare-Root Forest Nurseries: Focus on Different Tree Species

et al. 2021

View full text Add to dashboard Cite

The production of tree seedlings in forest nurseries and their use in the replanting of clear-cut forest sites is a common practice in the temperate and boreal forests of Europe. Although conifers dominate on replanted sites, in recent years, deciduous tree species have received more attention due to their often-higher resilience to abiotic and biotic stress factors. The aim of the present study was to assess the belowground fungal communities of bare-root cultivated seedlings of Alnus glutinosa, Betula pendula, Pinus sylvestris, Picea abies and Quercus robur in order to gain a better understanding of the associated fungi and oomycetes, and their potential effects on the seedling performance in forest nurseries and after outplanting. The study sites were at the seven largest bare-root forest nurseries in Lithuania. The sampling included the roots and adjacent soil of 2–3 year old healthy-looking seedlings. Following the isolation of the DNA from the individual root and soil samples, these were amplified using ITS rRNA as a marker, and subjected to high-throughput PacBio sequencing. The results showed the presence of 161,302 high-quality sequences, representing 2003 fungal and oomycete taxa. The most common fungi were Malassezia restricta (6.7% of all of the high-quality sequences), Wilcoxina mikolae (5.0%), Pustularia sp. 3993_4 (4.6%), and Fusarium oxysporum (3.5%). The most common oomycetes were Pythium ultimum var. ultimum (0.6%), Pythium heterothallicum (0.3%), Pythium spiculum (0.3%), and Pythium sylvaticum (0.2%). The coniferous tree species (P. abies and P. sylvestris) generally showed a higher richness of fungal taxa and a rather distinct fungal community composition compared to the deciduous tree species (A. glutinosa, B. pendula, and Q. robur). The results demonstrated that the seedling roots and the rhizosphere soil in forest nurseries support a high richness of fungal taxa. The seedling roots were primarily inhabited by saprotrophic and mycorrhizal fungi, while fungal pathogens and oomycetes were less abundant, showing that the cultivation practices used in forest nurseries secured both the production of high-quality planting stock and disease control.

show abstract

“…In strawberry, five genes for resistance to thirty races of P. fragariae have been described (Van de Weg, 1997); including Rpf1. Rpf1, a dominant gene (Van de Weg et al, 1997b) that confers resistance to at least 18 races of P. fragariae (Kennedy and Duncan, 1988;Nickerson and Murray, 1993;Scheewe, 1994;Van de Weg et al, 1997a). Previously, bulked segregant analysis (BSA) (Michelmore et al, 1991) was used to find eight randomly amplified polymorphic DNA (RAPD) markers linked to Rpf1 (Haymes et al, 1997).…”

mentioning

confidence: 99%

Development of SCAR Markers Linked to a Phytophthora fragariae Resistance Gene and Their Assessment in European and North American Strawberry Genotypes

Haymes¹,

Weg²,

Arens³

et al. 2000

jashs

View full text Add to dashboard Cite

Two dominant sequence characterized amplified region (SCAR) markers (linked at 3.0 cM, coupling phase) were constructed for the strawberry (Fragaria ×ananassa Duch.) gene Rpf1. This gene confers resistance to red stele root rot, caused by the soil-born fungus Phytophthora fragariae Hickman var. fragariae. The SCAR markers were developed originally from the sequence of RAPD OPO-16C(438) that is linked in repulsion phase to the Rpf1 allele. This SCAR primer set produced multiple bands in the resistant test progeny and in some of the susceptible progeny; therefore, new SCARs were developed based on the sequence differences among these bands. These new SCARs were linked in coupling phase to the Rpf allele and mapped to the same location as the original RAPD OPO-16C(438). The SCAR markers, as well as some additional RAPD markers known to be linked to Rpf1, were shown to be highly conserved in linkage to the gene based on examination of 133 European and North American Fragaria L. sp. cultivars and breeding selections. These flanking RAPD and SCAR-PCR markers can be used in breeding programs for the selection of red stele (Rpf1) resistance.

show abstract

Identification of pathogenic races of Phytophthora fragariae Hickman in Germany

Cited by 5 publications

References 10 publications

Assessment of the Resistance to Phytophthora fragariae var. fragariae of the USA and Canadian Differential Series of Strawberry Genotypes

Assessment of the Resistance to Phytophthora fragariae var. fragariae of the USA and Canadian Differential Series of Strawberry Genotypes

DNA-Metabarcoding of Belowground Fungal Communities in Bare-Root Forest Nurseries: Focus on Different Tree Species

Development of SCAR Markers Linked to a Phytophthora fragariae Resistance Gene and Their Assessment in European and North American Strawberry Genotypes

Contact Info

Product

Resources

About