Abstract
Abstract Myrtle rust, caused by Austropuccinia psidii , has been associated with more than 480 plant species belonging to the family Myrtaceae . Intraspecific variability in pathogenicity has been reported among isolates of A . psidii from different hosts. However, there are few studies that have comparatively quantified the disease in guava ( Psidium guajava ) and rose apple ( Syzygium jambos ). The objective of this work was to quantify the pathogenic variability of A . psidii isolates collected from guava and rose apple in Brazil and to investigate the mechanisms of infection and colonization of the pathogen at the cellular level. The monocyclic components of the rust disease were evaluated on young leaves of rose apple and guava plants cross‐inoculated with isolates from rose apple and guava. Pathogenic specialization of both A . psidii isolates for their respective hosts was confirmed in this work. The guava A . psidii isolate was able to infect and colonize rose apple leaf tissues but no sporulation occurred. Similarly, the rose apple A . psidii isolate infected guava plants but did not sporulate. Confocal laser scanning microscopy revealed that lobed haustoria were present within rose apple leaves at 2 days post‐inoculation (dpi) with both isolates, which resulted in intense mesophyll colonization for both interactions at 9 dpi. The latter is remarkable because infection of rose apple with the guava A . psidii isolate did not result in mature rust pustules.
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Claims 6
Claim · model-written summary
Rust isolates were specialized to their respective hosts.
- Taxon
- guava and rose apple
Psidium guajava
Syzygium jambost0 - Interactor
- A . psidii
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Austropuccinia psidiie0pathogen - Outcome
- Pathogenic specializatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Pathogenic specialization of both A . psidii isolates for their respective hosts was confirmed in this work”
t0“guava and rose apple”
Claim · model-written summary
The guava rust isolate infected and colonized rose apple leaves without sporulation.
- Taxon
- rose appleSyzygium jambose0
- Organ / stage
- leaf tissuese0
- Interactor
- A . psidiiAustropuccinia psidiie0pathogen
- Outcome
- infect and colonize rose apple leaf tissues but no sporulation occurrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The guava A . psidii isolate was able to infect and colonize rose apple leaf tissues but no sporulation occurred”
Claim · model-written summary
The rose apple rust isolate infected guava without sporulating.
- Taxon
- guavaPsidium guajavae0
- Interactor
- A . psidiiAustropuccinia psidiie0pathogen
- Outcome
- infected guava plants but did not sporulatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rose apple A . psidii isolate infected guava plants but did not sporulate”
Claim · model-written summary
Both isolates formed lobed haustoria in rose apple leaves at two days.
- Taxon
- rose appleSyzygium jambose0
- Organ / stage
- leavese0
- Interactor
- A . psidiiAustropuccinia psidiie1pathogen
- Outcome
- lobed haustoria were presente0
- Qualifier
- 2 days post‐inoculation (dpi)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lobed haustoria were present within rose apple leaves at 2 days post‐inoculation (dpi) with both isolates”
t0“Austropuccinia psidii”
e1“Intraspecific variability in pathogenicity has been reported among isolates of A . psidii from different hosts”
Claim · model-written summary
Both isolates intensely colonized rose apple mesophyll at nine days.
- Taxon
- rose appleSyzygium jambost0
- Interactor
- Austropuccinia psidiiAustropuccinia psidiit0pathogen
- Outcome
- intense mesophyll colonizatione0
- Qualifier
- 9 dpie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intense mesophyll colonization for both interactions at 9 dpi”
t0“Austropuccinia psidii isolates from guava and rose apple”
Claim · model-written summary
Guava isolate infection on rose apple did not form mature rust pustules.
- Taxon
- rose appleSyzygium jambose0
- Interactor
- A . psidiiAustropuccinia psidiie0pathogen
- Outcome
- did not result in mature rust pustulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infection of rose apple with the guava A . psidii isolate did not result in mature rust pustules”