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Identifying suitable tester for evaluating Striga resistant lines using DArTseq markers and agronomic traits.
Degife Zebire1,2,3, Abebe Menkir1, Victor Adetimirin4
1International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria.
Plos One
|June 18, 2021
Summary
A resistant tester (T2) is ideal for identifying superior Striga-resistant maize hybrids. This finding aids breeders in selecting effective testers for developing resistant crop varieties against parasitic weeds.
Area of Science:
- Agricultural Science
- Plant Breeding
- Genetics
Background:
- Developing Striga-resistant maize is crucial for food security in affected regions.
- Identifying effective testers is essential for successful hybrid breeding programs.
Purpose of the Study:
- To characterize Striga-resistant maize inbred lines and testers.
- To identify a suitable tester for Striga resistance hybrid breeding.
Main Methods:
- Utilized DArTseq SNP markers and agronomic traits for characterization.
- Estimated marker-based and agronomic trait-based genetic distances.
- Performed cluster analysis to group lines and testers.
Main Results:
- Resistant tester T2 demonstrated a broader genetic distance range with resistant lines.
- T2 formed high-yielding hybrids with desirable traits under Striga pressure.
- Significant positive association found between marker-based and trait-based distances with T2.
Conclusions:
- Resistant tester T2 is suitable for evaluating breeding values in Striga resistance hybrid programs.
- Tolerant tester T1 serves as an alternative for assessing combining ability.
- Highlights the importance of tester selection in breeding for resistance to biotic stresses.
