Abstract
Summary There are three major clonal lineages of Phytophthora ramorum present in North America and Europe named NA1, NA2, and EU1. Twenty‐three isolates representing all three lineages were evaluated for phenotype including (i) aggressiveness on detached Rhododendron leaves and (ii) growth rate at minimum, optimum, and maximum temperatures. Closely related species P. foliorum and P. hibernalis were included in phenotypic tests since these species are encountered in nursery surveys for P. ramorum. Isolates from the NA2 and EU1 lineages were the most aggressive and isolates from the NA1 group were the least aggressive. The NA1 lineage of P. ramorum was the most variable in aggressiveness and growth rate. The variability in the NA1 lineage was due to the presence of non‐wild type (nwt) isolates. There was no significant difference in growth rate among NA1 wild type (wt), NA2, and EU1 lineages at any temperature tested. The difference between wt and nwt P. ramorum isolates is discussed.
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Claims 4
Claim · model-written summary
NA2 and EU1 Phytophthora ramorum isolates were most aggressive on detached Rhododendron leaves, while NA1 isolates were least aggressive.
- Taxon
- Rhododendron
Rhododendrone0 - Organ / stage
- leavese0
- Interactor
- Phytophthora ramorum
Phytophthora ramorumt0pathogen - Outcome
- aggressivenesse0
- Direction
- most aggressivee1
- Comparator
- NA1 groupe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aggressiveness on detached Rhododendron leaves”
e1“Isolates from the NA2 and EU1 lineages were the most aggressive and isolates from the NA1 group were the least aggressive.”
t0“Phytophthora ramorum”
Claim · model-written summary
NA1 isolates varied most in aggressiveness and growth rate.
- Taxon
- RhododendronRhododendrone1
- Interactor
- P. ramorumPhytophthora ramorume0pathogen
- Outcome
- aggressiveness and growth ratee0
- Direction
- most variablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NA1 lineage of P. ramorum was the most variable in aggressiveness and growth rate.”
e1“aggressiveness on detached Rhododendron leaves”
Claim · model-written summary
The NA1 variation was attributed to non wild type isolates.
- Taxon
- RhododendronRhododendrone1
- Interactor
- Phytophthora ramorumPhytophthora ramorumt0pathogen
- Outcome
- variabilitye0
- Qualifier
- presence of non‐wild type (nwt) isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The variability in the NA1 lineage was due to the presence of non‐wild type (nwt) isolates.”
e1“aggressiveness on detached Rhododendron leaves”
t0“Phytophthora ramorum”
Claim · model-written summary
Growth rates did not differ significantly among wild type NA1, NA2 and EU1 lineages at tested temperatures.
- Taxon
- RhododendronRhododendrone1
- Interactor
- Phytophthora ramorumPhytophthora ramorumt0pathogen
- Outcome
- growth ratee0
- Direction
- no significant differencee0
- Qualifier
- at any temperature testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant difference in growth rate among NA1 wild type (wt), NA2, and EU1 lineages at any temperature tested.”
e1“aggressiveness on detached Rhododendron leaves”
t0“Phytophthora ramorum”