Abstract
In recent years soybean rust, caused by Phakopsora pachyrhizi has become one of the most serious threats to soybean production in Brazil. Breeding lines and varieties have been selected for resistance to soybean rust in Asia. However, differences in virulence between Asian and Brazilian rust populations should be considered in order to select and use resistant resources from Asia. Here, we suggest criteria for distinguishing resistant from susceptible types by the analysis of four resistance characters: frequency of lesions having uredinia, number of uredinia per lesion, frequency of open uredinia, and sporulation level, determined by the utilization of 63 genotypes. Under growth chamber conditions, a set of 13 soybean varieties were exposed to three rust populations-one from Japan and two from Brazil-and evaluated for the resistance characters mentioned above. The Japanese and Brazilian populations clearly differed in virulence, as did the two Brazilian populations. Only two resistance genes, Rpp4 from PI459025 and Rpp5 from Shiranui, commonly conferred resistance on all three rust populations. The number of resistant varieties or resistance genes useful in both countries appears limited. Therefore, a resistant cultivar that is universally effective against soybean rust should be developed by pyramiding some major resistance genes and by introducing horizontal resistance.
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Claims 7
Claim · model-written summary
The authors propose four characters to distinguish resistant from susceptible soybean types.
- Taxon
- soybean
Glycine maxt0 - Outcome
- criteria for distinguishing resistant from susceptible typese0
- Value
- four resistance characterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we suggest criteria for distinguishing resistant from susceptible types by the analysis of four resistance characters: frequency of lesions having uredinia, number of uredinia per lesion, frequency of open uredinia, and sporulation level”
t0“soybean”
Claim · model-written summary
The Japanese and Brazilian rust populations differed clearly in virulence on soybean.
- Taxon
- soybeanGlycine maxe1
- Interactor
- rust populationse1pathogen
- Outcome
- populations clearly differed in virulencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Japanese and Brazilian populations clearly differed in virulence”
e1“soybean varieties were exposed to three rust populations”
Claim · model-written summary
The two Brazilian rust populations differed clearly in virulence on soybean.
- Taxon
- soybeanGlycine maxe2
- Interactor
- rust populationse2pathogen
- Outcome
- differed in virulencee1
- Qualifier
- two Brazilian populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as did the two Brazilian populations”
e1“The Japanese and Brazilian populations clearly differed in virulence”
e2“soybean varieties were exposed to three rust populations”
Claim · model-written summary
Rpp4 from PI459025 conferred resistance to all three rust populations.
- Taxon
- soybeanGlycine maxt0
- Material
- PI459025e0
- Interactor
- rust populationse0pathogen
- Gene
- Rpp4e0
- Outcome
- conferred resistance on all three rust populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only two resistance genes, Rpp4 from PI459025 and Rpp5 from Shiranui, commonly conferred resistance on all three rust populations.”
t0“soybean”
Claim · model-written summary
Rpp5 from Shiranui conferred resistance to all three rust populations.
- Taxon
- soybeanGlycine maxt0
- Material
- Shiranuie0
- Interactor
- rust populationse0pathogen
- Gene
- Rpp5e0
- Outcome
- conferred resistance on all three rust populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only two resistance genes, Rpp4 from PI459025 and Rpp5 from Shiranui, commonly conferred resistance on all three rust populations.”
t0“soybean”
Claim · model-written summary
The authors infer that soybean resistance varieties or genes useful in both countries are limited.
- Taxon
- soybeanGlycine maxt0
- Outcome
- number of resistant varieties or resistance genes useful in both countriese0
- Direction
- limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of resistant varieties or resistance genes useful in both countries appears limited.”
t0“soybean”
Claim · model-written summary
The authors recommend pyramiding major resistance genes and introducing horizontal resistance to develop universally effective soybean rust resistance.
- Taxon
- soybeanGlycine maxe0
- Outcome
- a resistant cultivar that is universally effective against soybean ruste0
- Qualifier
- pyramiding some major resistance genes and by introducing horizontal resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a resistant cultivar that is universally effective against soybean rust should be developed by pyramiding some major resistance genes and by introducing horizontal resistance.”