Phytophthora inpestans A2 compatibility type recorded in Great Britain

Malcolmson, Jean F.

doi:10.1016/s0007-1536(85)80054-1

Cited by 38 publications

(16 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…New races may evolve even more rapidly since the A2 compatibility type of the pathogen has appeared in Europe (Hohl & Iselin, 1984 ;Malcolmson, 1985 ;Shaw et al ., 1985) . Consequently, this type of resistance is no longer of much use .…”

Section: Introductionmentioning

confidence: 99%

Resistance to late blight (Phytophthora infestans) in ten wild Solanum species

Colon¹,

Budding²

1988

Euphytica

View full text Add to dashboard Cite

Nineteen accessions of the tuber-bearing species Solanum berthaultii, S . chacoense, S . leptophyes, S. microdontum, S. sparsipilum, S . sucrense, S. venturii, S. vernei and S. verrucosum were tested for their resistance to late blight in two years of field experiments . Plants were artificially inoculated with zoospores of race 1 .2 .3 .4.5 .7 .10 .11 and the development of the disease was followed . Resistance ratings, calculated as the areas under the disease progress curves (ADPC), demonstrated a high resistance in all accessions except in S . sparsipilum, S. leptophyes and their interspecific hybrid . Segregations suggest that major genes for resistance are present in S. sucrense and S . venturii, and may also play a role in S. verrucosum . It is not yet certain wether the resistance of the other accessions is comparable to the partial and durable resistance of S . tuberosum cultivars like Pimpernel, as inheritance and mechanism have yet to be established . However, segregations suggesting the presence of single major genes with complete dominance were not found in these other accessions . Tuber initiation in the field occurred in only one accession, S . tuberosum ssp . andigena, and maturity of the clones was not related to their resistance . In the other accessions maturity types could not be assessed, as the clones require short day conditions for tuber initiation .

show abstract

Section: Introductionmentioning

confidence: 99%

Resistance to late blight (Phytophthora infestans) in ten wild Solanum species

Colon¹,

Budding²

1988

Euphytica

View full text Add to dashboard Cite

show abstract

“…Extractions of total genomic DNA and Southern analyses with DNA "fingerprint" probe RG57 were as described previously (15,16). Probe RG57 is a highly polymorphic, moderately repetitive nuclear DNA from P. infestans that hybridizes to more than 25 different loci in P. infestans and related species (13,15 1984-198619881980-198519891985-1989Before 19901979-199019901977Before 1984 Sample size* 21 (11) 5 (2) 8 (1) 7 (7) 2 (2) 2 (1) 9 (8) 30 (29) 27 (15) 28 (28) 62 (34) 1 (1) 5 (5) 2 (2) 3 (2) (17). Trees were constructed by using the unweighted pair-group method of averages (UPGMA) algorithm from a Rogers' modified genetic distance (17,18) matrix.…”

mentioning

confidence: 99%

Panglobal distribution of a single clonal lineage of the Irish potato famine fungus.

Goodwin

Cohen²,

Fry³

1994

Proc. Natl. Acad. Sci. U.S.A.

401

265

View full text Add to dashboard Cite

show abstract

“…This set off mating type surveys all over the world and was soon followed by reports showing that the A2 mating type had spread not only to Europe but worldwide (e.g., Malcolmson, 1985;Shaw et al, 1985;Tantius et al, 1986;Kadir and Umaerus, 1987;Mosa et al, 1989). Like the epidemics of the 1840s caused by the first introduction of P. infestans in Europe by import of infected seed, this worldwide emergence of the A2 mating type in the 1980s has been explained by migration (Fry et al, 1993).…”

Section: Mating Type Distributionmentioning

confidence: 99%

The Role of Oospores in the Epidemiology of Potato Late Blight

Andersson¹,

Widmark²,

Yuen³

et al. 2009

Acta Hortic.

View full text Add to dashboard Cite

Potato late blight (Phytophthora infestans) is a plant disease feared globally by farmers and the potato industry. P. infestans is a heterothallic oomycete with two mating types. Until recently the pathogen was limited to surviving between seasons as living mycelia in its host plant in most parts of the world. This was due to the fact that populations of P. infestans consisted of only one mating type (A1) in all parts of the world except Mexico, the putative centre of origin of the pathogen. Migration of new genotypes from Mexico, including genotypes of the second mating type (A2) has resulted in that now both mating types can be found worldwide. The formation of oospores is only possible if both mating types coexist. Oospores will give the pathogen the ability of surviving for extended periods of time outside its host, for example in the soil. There are reports of oospore formation under field conditions from many parts of the world. Also, in some places oospores are considered as a new, additional inoculum source and as a consequence the onset of late blight epidemics have become earlier. Oospores are formed through sexual recombination. If they act as a source of inoculum, this will increase the genotypic variation in populations of P. infestans leading to an enhanced adaptability of the pathogen. As a consequence, an earlier start of epidemics caused by oospores in the soil and a more aggressive behaviour of the pathogen due to new sexually formed genotypes could make potato late blight even more difficult to control in the future.

show abstract

Phytophthora inpestans A2 compatibility type recorded in Great Britain

Cited by 38 publications

References 3 publications

Resistance to late blight (Phytophthora infestans) in ten wild Solanum species

Resistance to late blight (Phytophthora infestans) in ten wild Solanum species

Panglobal distribution of a single clonal lineage of the Irish potato famine fungus.

The Role of Oospores in the Epidemiology of Potato Late Blight

Contact Info

Product

Resources

About