Abstract
Melampsora lini, the causal agent of rust disease on flax and linseed (Linum usitatissimum), also occurs on the indigenous Australian species Linum marginale. Forty-five isolates of M. lini collected from L. marginale plants at 21 locations were tested for pathogenicity on 46 lines of L. marginale that originated from 22 sites spanning the same range (approximately 2000 km) covered by the rust isolate collection sites. The results reveal the existence of extensive variation in both host and pathogen. Rust isolates originating from different sites possessed unique virulence patterns in all cases. Among the host lines, 21 different phenotypes were identified. Lines from six sites were susceptible to all isolates, but no line was resistant to all isolates. The results, together with those of a companion study, provide evidence of virulence-gene adaptation of M. lini to different host species and of adaptation on a broad geographic scale within a host species. The rust reaction data suggest that the N gene for resistance in L. usitatissimum also occurs in L. marginale, but otherwise there is no evidence for commonality between the (presumptive) resistance genes in L. marginale and those in L. usitatissimum.
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Claims 8
Claim · model-written summary
Rust isolates from different sites had unique virulence patterns.
- Taxon
- Linum marginale
Linum marginalet0 - Interactor
- Rust isolatese0pathogen
- Outcome
- unique virulence patternse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust isolates originating from different sites possessed unique virulence patterns in all cases.”
t0“Linum marginale”
Claim · model-written summary
Host lines had 21 distinct phenotypes.
- Taxon
- Linum marginaleLinum marginalet0
- Outcome
- different phenotypese0
- Value
- 21e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the host lines, 21 different phenotypes were identified.”
t0“Linum marginale”
Claim · model-written summary
Lines from six sites were susceptible to all rust isolates.
- Taxon
- Linum marginaleLinum marginalet0
- Outcome
- susceptible to all isolatese0
- Value
- six sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lines from six sites were susceptible to all isolates”
t0“Linum marginale”
Claim · model-written summary
No host line resisted every isolate.
- Taxon
- Linum marginaleLinum marginalet0
- Outcome
- no line was resistant to all isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no line was resistant to all isolates”
t0“Linum marginale”
Claim · model-written summary
Rust virulence genes show adaptation to different host species.
- Taxon
- Linum marginaleLinum marginalet0
- Interactor
- M. lini
.jpeg?width=60)
Melampsora linie0pathogen - Outcome
- virulence-gene adaptation of M. lini to different host speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpeg?width=500)
Verbatim
e0“provide evidence of virulence-gene adaptation of M. lini to different host species”
t0“Linum marginale”
Claim · model-written summary
Rust virulence shows broad geographic adaptation within a host species.
- Taxon
- Linum marginaleLinum marginalet0
- Outcome
- adaptation on a broad geographic scale within a host speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“adaptation on a broad geographic scale within a host species”
t0“Linum marginale”
Claim · model-written summary
The N resistance gene may occur in both flax species.
- Taxon
- L. marginaleLinum marginalee0
- Gene
- N genee0
- Outcome
- also occurs in L. marginalee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the N gene for resistance in L. usitatissimum also occurs in L. marginale”
Claim · model-written summary
Other presumed resistance genes showed no evidence of commonality between the species.
- Taxon
- L. marginaleLinum marginalee0
- Gene
- resistance genese0
- Outcome
- no evidence for commonalitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no evidence for commonality between the (presumptive) resistance genes in L. marginale and those in L. usitatissimum”