Abstract
Rust caused by Puccinia substriata var. indica can be very damaging on pearl millet in the southeastern United States. Breeding rust-resistant pearl millet cultivars is complicated by unknown pathogenic variation in the pathogen population. In the present study, 15 single-uredinial isolates of the pathogen were evaluated for pathogenic variation on seedlings of 29 resistant pearl millet germ plasm lines. Eleven races were identified based on seedling reactions. The reaction of the races on the germ plasm lines ranged from virulence to 15 lines to virulence to all 29 lines. Although some lines were susceptible to all races, others were resistant to as many as seven races and constitute new potential sources for genetic resistance. Field studies conducted in 1993 and 1994 indicated that most of the 11 races are probably not yet predominant in the pathogen population at Tifton, Georgia, since some lines susceptible to many races showed low levels of disease in the field. These races will be important as tools for future screening in pearl millet germ plasm for additional sources of resistance to P. substriata var. indica.
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Claims 6
Claim · model-written summary
Eleven races of Puccinia substriata var. indica were identified based on seedling reactions.
- Taxon
- pearl millet
Cenchrus americanuse0 - Interactor
- Puccinia substriata var. indicaPuccinia substriata var. indicae0pathogen
- Outcome
- racese1
- Value
- Eleven racese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust caused by Puccinia substriata var. indica can be very damaging on pearl millet in the southeastern United States”
e1“Eleven races were identified based on seedling reactions”
Claim · model-written summary
The reaction of the races on the germ plasm lines ranged from virulence to 15 lines to virulence to all 29 lines.
- Taxon
- pearl milletCenchrus americanuse0
- Material
- germ plasm linese3
- Interactor
- Puccinia substriata var. indicaPuccinia substriata var. indicae0pathogen
- Outcome
- virulencee3
- Qualifier
- ranged from virulence to 15 lines to virulence to all 29 linese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust caused by Puccinia substriata var. indica can be very damaging on pearl millet in the southeastern United States”
e3“The reaction of the races on the germ plasm lines ranged from virulence to 15 lines to virulence to all 29 lines”
Claim · model-written summary
Others of the pearl millet lines were resistant to as many as seven races and are new potential sources of resistance.
- Taxon
- pearl milletCenchrus americanuse0
- Interactor
- Puccinia substriata var. indicaPuccinia substriata var. indicae0pathogen
- Outcome
- resistancee4
- Value
- as many as seven racese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust caused by Puccinia substriata var. indica can be very damaging on pearl millet in the southeastern United States”
e4“Although some lines were susceptible to all races, others were resistant to as many as seven races and constitute new potential sources for genetic resistance”
Claim · model-written summary
Some lines susceptible to many races showed low levels of disease in the field.
- Taxon
- pearl milletCenchrus americanuse0
- Interactor
- Puccinia substriata var. indicaPuccinia substriata var. indicae0pathogen
- Outcome
- levels of diseasee5
- Setting
- in the fielde5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust caused by Puccinia substriata var. indica can be very damaging on pearl millet in the southeastern United States”
e5“Field studies conducted in 1993 and 1994 indicated that most of the 11 races are probably not yet predominant in the pathogen population at Tifton, Georgia, since some lines susceptible to many races showed low levels of disease in the field”
Claim · model-written summary
Most of the 11 races are probably not yet predominant in the pathogen population at Tifton, Georgia.
- Taxon
- pearl milletCenchrus americanuse0
- Interactor
- Puccinia substriata var. indicaPuccinia substriata var. indicae0pathogen
- Outcome
- predominant in the pathogen populatione5
- Qualifier
- probably not yete5
- Setting
- Tifton, Georgiae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust caused by Puccinia substriata var. indica can be very damaging on pearl millet in the southeastern United States”
e5“Field studies conducted in 1993 and 1994 indicated that most of the 11 races are probably not yet predominant in the pathogen population at Tifton, Georgia, since some lines susceptible to many races showed low levels of disease in the field”
Claim · model-written summary
These races will be important as tools for future screening in pearl millet germ plasm for additional sources of resistance.
- Taxon
- pearl milletCenchrus americanuse6
- Interactor
- P. substriata var. indicaPuccinia substriata var. indicae6pathogen
- Outcome
- tools for future screening in pearl millet germ plasme6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“These races will be important as tools for future screening in pearl millet germ plasm for additional sources of resistance to P. substriata var. indica”