Abstract
The aggressiveness of 20 Northern Ireland single‐lesion isolates of Phytophthora infestans was compared following their inoculation onto detached leaflets of three potato cultivars chosen on the basis of their differing levels of race‐nonspecific resistance to late blight: Bintje (highly susceptible); Cara (moderately resistant); and Stirling (more resistant). Five isolates from outside Northern Ireland were included for comparative purposes: two from the Republic of Ireland; two from the USA (representing the US‐1 and US‐8 clonal lineages); and one from Mexico. To control the variation between tests, a balanced incomplete block design was used, as opposed to either a complete block design or the method of inclusion of standard isolates, where such variation would have increased the error. Highly significant variation for disease parameters, including latent period, infection frequency, area under the lesion expansion curve (AULEC) and sporulation capacity, was found between isolates. These differences were much more marked on the cultivars exhibiting higher levels of race‐nonspecific resistance. There was a significant interaction between isolate and cultivar for all parameters assessed and, overall, no one isolate was the most aggressive across all three potato cultivars. However, a group comprising seven of the 20 Northern Ireland isolates was consistently found to exhibit the highest levels of aggression towards all three cultivars for each of the disease parameters. These results demonstrate that significant variation for foliar aggressiveness exists within the Northern Ireland population of P. infestans , and indicate the importance of selecting appropriately aggressive isolates for evaluation of host resistance to late blight within breeding programmes.
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Claims 6
Claim · model-written summary
Potato leaflets showed highly significant isolate variation in four disease parameters.
- Taxon
- potato
Solanum tuberosumt0 - Interactor
- Phytophthora infestans
Phytophthora infestanst1pathogen - Outcome
- latent period, infection frequency, area under the lesion expansion curve (AULEC) and sporulation capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highly significant variation for disease parameters, including latent period, infection frequency, area under the lesion expansion curve (AULEC) and sporulation capacity, was found between isolates.”
t0“potato cultivars”
t1“Phytophthora infestans on detached leaflets”
Claim · model-written summary
Isolate differences were stronger on more resistant cultivars.
- Taxon
- potatoSolanum tuberosumt0
- Material
- cultivars exhibiting higher levels of race‐nonspecific resistancee0
- Interactor
- Phytophthora infestansPhytophthora infestanst1pathogen
- Outcome
- differencese0
- Direction
- much more markede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These differences were much more marked on the cultivars exhibiting higher levels of race‐nonspecific resistance.”
t0“potato cultivars”
t1“Phytophthora infestans on detached leaflets”
Claim · model-written summary
Isolate and cultivar interacted significantly for all assessed parameters.
- Taxon
- potatoSolanum tuberosumt0
- Material
- cultivare0
- Interactor
- Phytophthora infestansPhytophthora infestanst1pathogen
- Outcome
- all parameters assessede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant interaction between isolate and cultivar for all parameters assessed”
t0“potato cultivars”
t1“Phytophthora infestans on detached leaflets”
Claim · model-written summary
No isolate was most aggressive across all three cultivars.
- Taxon
- potatoSolanum tuberosume0
- Interactor
- Phytophthora infestansPhytophthora infestanst0pathogen
- Outcome
- no one isolate was the most aggressive across all three potato cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overall, no one isolate was the most aggressive across all three potato cultivars”
t0“Phytophthora infestans”
Claim · model-written summary
Seven Northern Ireland isolates consistently showed highest aggression across cultivars and disease parameters.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- Phytophthora infestansPhytophthora infestanst1pathogen
- Outcome
- levels of aggressione0
- Direction
- higheste0
- Value
- seven of the 20 Northern Ireland isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a group comprising seven of the 20 Northern Ireland isolates was consistently found to exhibit the highest levels of aggression towards all three cultivars for each of the disease parameters”
t0“potato cultivars”
t1“Phytophthora infestans”
Claim · model-written summary
The authors recommend selecting suitably aggressive isolates for potato resistance evaluation.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- Phytophthora infestansPhytophthora infestanst1pathogen
- Outcome
- selecting appropriately aggressive isolates for evaluation of host resistance to late blight within breeding programmese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicate the importance of selecting appropriately aggressive isolates for evaluation of host resistance to late blight within breeding programmes.”
t0“potato cultivars”
t1“Phytophthora infestans”