Nucleotide Diversity and Linkage Disequilibrium in Ryegrass Resistance Genes
Author Information
Author(s): Xing Yongzhong, Frei Uschi, Schejbel Britt, Asp Torben, Lübberstedt Thomas
Primary Institution: University of Århus, Faculty of Agricultural Sciences, Department of Genetics and Biotechnology, Research Centre Flakkebjerg, Slagelse, Denmark
Hypothesis
What is the nucleotide diversity and linkage disequilibrium in expressed resistance candidate genes in Lolium perenne?
Conclusion
Substantial linkage disequilibrium decay was found within a distance of 500 bp for most resistance candidate genes, indicating that LD-based association analysis is feasible for QTL fine mapping in ryegrass.
Supporting Evidence
- 11 expressed disease resistance candidate genes were analyzed for nucleotide diversity.
- On average, one SNP was present every 33 bp between two randomly sampled sequences.
- NBS-LRR like gene fragments showed a high degree of nucleotide diversity.
- 78% of haplotypes occurred at low frequency (<5%) within the collection of 20 genotypes.
- Low intragenic linkage disequilibrium was detected for most R genes.
Takeaway
Scientists studied genes in ryegrass that help it resist diseases and found a lot of genetic differences, which can help improve the plant's resistance to diseases.
Methodology
The study sequenced about 1 kb regions of 11 expressed disease resistance candidate genes from 20 heterozygous ryegrass genotypes and analyzed nucleotide diversity and linkage disequilibrium.
Limitations
The study is limited to 20 genotypes, which may not represent the entire genetic diversity of ryegrass.
Participant Demographics
The study included 20 heterozygous genotypes of perennial ryegrass from various European sources.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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