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Yield-enhancing quantitative trait loci (QTLs) from wild species
B P Mallikarjuna Swamy1, N Sarla
1Directorate of Rice Research, Rajendranagar, Hyderabad 500030, India. bpms1@rediffmail.com
Biotechnology Advances
|October 24, 2007
Summary
Wild crop relatives provide valuable yield-enhancing quantitative trait loci (QTLs). Advanced backcross QTL analysis identifies beneficial alleles, though their effectiveness can vary with genetic context.
Area of Science:
- Plant genetics
- Agronomy
- Molecular biology
Background:
- Wild species are crucial genetic resources for improving crop cultivars, particularly for complex traits like yield.
- Quantitative trait loci (QTLs) mapping using dense molecular maps facilitates the identification of genes controlling yield.
Purpose of the Study:
- To review and summarize literature on yield QTLs identified from wild species.
- To highlight the application of advanced backcross QTL analysis in crop improvement.
- To discuss the distribution, co-location, and context-dependency of yield QTLs.
Main Methods:
- Advanced backcross QTL (AB-QTL) analysis was employed to introgress favorable alleles from wild relatives into cultivated varieties.
- Quantitative trait loci (QTLs) for yield and related traits were mapped using dense molecular maps.
- Literature review focusing on rice and tomato was conducted.
Main Results:
- Yield-enhancing QTLs have been identified from wild relatives across numerous crop species, often mapping to specific chromosomal regions.
- Co-location of yield QTLs and QTLs for correlated traits suggests linkage or pleiotropic effects.
- Many QTLs show consistent effects across different environments and genetic backgrounds, while others exhibit context-dependency.
Conclusions:
- Wild species harbor significant genetic resources for enhancing crop yield through QTLs.
- Advanced backcross QTL analysis is a powerful tool for identifying and utilizing these beneficial QTLs.
- The context-dependency of QTL effects remains a key consideration for marker-assisted selection in crop breeding.
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