Abstract
ABSTRACT The dynamic multiline population breeding strategy integrates principles from the gene stacking and multiline approaches and allows application of the multiline strategy to cross-pollinated hybrid crops. Experiments were conducted to evaluate the effectiveness of the breeding approach. Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces, 3 Pennisetum glaucum subsp. monodii accessions, and 2 elite inbreds (1 from India and 1 from the United States). Four cycles of open pollination were made, the last two in the field in rust epidemics. Cytoplasmic male-sterile (CMS) counterparts of the populations in the A(4) cytoplasm were included and advanced simultaneously with the B population. Hybrids with Tift 383 were produced on CMS cycles 1 (C1) through C4. Frequency of hybrid seedlings with resistance increased with each cycle, and frequencies averaged 18 to 38% in C1 to C4 hybrids, respectively, when inoculated with five single-uredinium isolates of Puccinia substriata var. indica. The hybrid populations and Tifleaf (TL)1 and TL2 were evaluated in three yield trials in 1998 to 1999. Disease-free forage dry matter yields did not differ among hybrids. Across trials, area under the disease progress curve (AUDPC) of TL1 and TL2 averaged 1,307, C1 and C2 averaged 914, and C3 and C4 averaged 604. Final severities of TL1 and TL2 averaged 67%, C1 and C2 averaged 47%, and C3 and C4 averaged 30%. When analyzed by regression analysis, AUDPC was reduced 12.2%, final rust severity was reduced 13.3%, and digestible biomass was increased 4.1% per cycle.
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Claims 11
Claim · model-written summary
Frequency of pearl millet hybrid seedlings with rust resistance increased with each breeding cycle.
- Taxon
- pearl millet
Cenchrus americanuse1 - Treatment
- each cyclee2
- Interactor
- Puccinia substriata var. indicaPuccinia substriata var. indicae2pathogen
- Outcome
- Frequency of hybrid seedlings with resistancee2
- Direction
- increasede2
- Value
- 18 to 38%e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e2“Frequency of hybrid seedlings with resistance increased with each cycle, and frequencies averaged 18 to 38% in C1 to C4 hybrids, respectively, when inoculated with five single-uredinium isolates of Puccinia substriata var. indica”
Claim · model-written summary
Across trials, area under the disease progress curve of TL1 and TL2 averaged 1,307.
- Taxon
- pearl milletCenchrus americanuse1
- Material
- TL1 and TL2e3
- Outcome
- area under the disease progress curve (AUDPC)e3
- Value
- 1,307e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e3“Across trials, area under the disease progress curve (AUDPC) of TL1 and TL2 averaged 1,307, C1 and C2 averaged 914, and C3 and C4 averaged 604”
Claim · model-written summary
Across trials, area under the disease progress curve of C1 and C2 averaged 914.
- Taxon
- pearl milletCenchrus americanuse1
- Material
- C1 and C2e3
- Outcome
- area under the disease progress curve (AUDPC)e3
- Value
- 914e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e3“Across trials, area under the disease progress curve (AUDPC) of TL1 and TL2 averaged 1,307, C1 and C2 averaged 914, and C3 and C4 averaged 604”
Claim · model-written summary
Across trials, area under the disease progress curve of C3 and C4 averaged 604.
- Taxon
- pearl milletCenchrus americanuse1
- Material
- C3 and C4e3
- Outcome
- area under the disease progress curve (AUDPC)e3
- Value
- 604e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e3“Across trials, area under the disease progress curve (AUDPC) of TL1 and TL2 averaged 1,307, C1 and C2 averaged 914, and C3 and C4 averaged 604”
Claim · model-written summary
Final rust severity of TL1 and TL2 averaged 67%.
- Taxon
- pearl milletCenchrus americanuse1
- Material
- TL1 and TL2e4
- Outcome
- Final severitiese4
- Value
- 67%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e4“Final severities of TL1 and TL2 averaged 67%, C1 and C2 averaged 47%, and C3 and C4 averaged 30%”
Claim · model-written summary
Final rust severity of C1 and C2 averaged 47%.
- Taxon
- pearl milletCenchrus americanuse1
- Material
- C1 and C2e4
- Outcome
- Final severitiese4
- Value
- 47%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e4“Final severities of TL1 and TL2 averaged 67%, C1 and C2 averaged 47%, and C3 and C4 averaged 30%”
Claim · model-written summary
Final rust severity of C3 and C4 averaged 30%.
- Taxon
- pearl milletCenchrus americanuse1
- Material
- C3 and C4e4
- Outcome
- Final severitiese4
- Value
- 30%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e4“Final severities of TL1 and TL2 averaged 67%, C1 and C2 averaged 47%, and C3 and C4 averaged 30%”
Claim · model-written summary
In regression analysis, AUDPC was reduced 12.2% per breeding cycle.
- Taxon
- pearl milletCenchrus americanuse1
- Treatment
- per cyclee5
- Outcome
- AUDPCe5
- Direction
- reducede5
- Value
- 12.2%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e5“When analyzed by regression analysis, AUDPC was reduced 12.2%, final rust severity was reduced 13.3%, and digestible biomass was increased 4.1% per cycle”
Claim · model-written summary
In regression analysis, final rust severity was reduced 13.3% per breeding cycle.
- Taxon
- pearl milletCenchrus americanuse1
- Treatment
- per cyclee5
- Outcome
- final rust severitye5
- Direction
- reducede5
- Value
- 13.3%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e5“When analyzed by regression analysis, AUDPC was reduced 12.2%, final rust severity was reduced 13.3%, and digestible biomass was increased 4.1% per cycle”
Claim · model-written summary
In regression analysis, digestible biomass was increased 4.1% per breeding cycle.
- Taxon
- pearl milletCenchrus americanuse1
- Treatment
- per cyclee5
- Outcome
- digestible biomasse5
- Direction
- increasede5
- Value
- 4.1%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e5“When analyzed by regression analysis, AUDPC was reduced 12.2%, final rust severity was reduced 13.3%, and digestible biomass was increased 4.1% per cycle”
Claim · model-written summary
Disease-free forage dry matter yields did not differ among pearl millet hybrids.
- Taxon
- pearl milletCenchrus americanuse1
- Outcome
- Disease-free forage dry matter yieldse6
- Direction
- did not differe6
- Comparator
- among hybridse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Backcross derivatives of pearl millet Tift 23DB were developed with rust resistance from 18 Burkina Faso landraces”
e6“Disease-free forage dry matter yields did not differ among hybrids”