Abstract
Some asexual isolates of the bean rust fungus, Uromyces appendiculatus, exhibit unusual isozyme and host-specific virulence traits. As a hybridization method not involving donor spermatia, urediniospores were applied to receptor pycnia. Aecia developed in a minority (< 10%) of the trials. Inoculations with first sibling generation urediniospores of the putative hybrid progeny on five differential bean lines often produced infection types that matched those of the maternal parent; therefore virulence did not clearly indicate successful crossing. However, urediniospore isozyme patterns containing bands from both parents for six enzymes confirmed hybridization in 7 of 14 progeny. Bands for the remaining progeny matched the maternal parent, indicating origin by selling. Thus, the electrophoretic results indicate that, in the bean rust fungus, urediniospores sometimes can act as spermatia (nuclear donors) for fertilization of pycnia. Pycnium × uredinium crossing should prove to be a useful technique for genetic studies of asexual rust populations.
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Claims 5
Claim · model-written summary
Aecia developed in a minority of the bean rust inoculation trials (under 10%).
- Taxon
- beane0
- Interactor
- Uromyces appendiculatus
.jpg?width=60)
Uromyces appendiculatuse0pathogen - Outcome
- Aecia developede1
- Value
- < 10%e1
- Qualifier
- in a minoritye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Some asexual isolates of the bean rust fungus, Uromyces appendiculatus, exhibit unusual isozyme and host-specific virulence traits”
e1“Aecia developed in a minority (< 10%) of the trials”
Claim · model-written summary
Infection types on bean lines often matched the maternal parent, so virulence did not clearly indicate successful crossing.
- Taxon
- beane2
- Interactor
- Uromyces appendiculatusUromyces appendiculatuse0pathogen
- Outcome
- infection typese2
- Qualifier
- did not clearly indicate successful crossinge2
- Comparator
- maternal parente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some asexual isolates of the bean rust fungus, Uromyces appendiculatus, exhibit unusual isozyme and host-specific virulence traits”
e2“Inoculations with first sibling generation urediniospores of the putative hybrid progeny on five differential bean lines often produced infection types that matched those of the maternal parent; therefore virulence did not clearly indicate successful crossing”
Claim · model-written summary
Isozyme patterns confirmed hybridization in 7 of 14 progeny for six enzymes.
- Taxon
- beane0
- Interactor
- Uromyces appendiculatusUromyces appendiculatuse0pathogen
- Outcome
- hybridizatione3
- Value
- 7 of 14 progenye3
- Qualifier
- for six enzymese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some asexual isolates of the bean rust fungus, Uromyces appendiculatus, exhibit unusual isozyme and host-specific virulence traits”
e3“urediniospore isozyme patterns containing bands from both parents for six enzymes confirmed hybridization in 7 of 14 progeny”
Claim · model-written summary
Bands of the remaining progeny matched the maternal parent, indicating origin by selling.
- Taxon
- beane0
- Interactor
- Uromyces appendiculatusUromyces appendiculatuse0pathogen
- Outcome
- Bands for the remaining progenye4
- Direction
- matchede4
- Qualifier
- indicating origin by sellinge4
- Comparator
- maternal parente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some asexual isolates of the bean rust fungus, Uromyces appendiculatus, exhibit unusual isozyme and host-specific virulence traits”
e4“Bands for the remaining progeny matched the maternal parent, indicating origin by selling”
Claim · model-written summary
Urediniospores can sometimes act as spermatia for fertilization of pycnia.
- Taxon
- beane0
- Interactor
- Uromyces appendiculatusUromyces appendiculatuse0pathogen
- Outcome
- can act as spermatiae5
- Qualifier
- for fertilization of pycniae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some asexual isolates of the bean rust fungus, Uromyces appendiculatus, exhibit unusual isozyme and host-specific virulence traits”
e5“urediniospores sometimes can act as spermatia (nuclear donors) for fertilization of pycnia”