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Published on: August 11, 2011
Genetic diversity among barley cultivars assessed by sequence-specific amplification polymorphism
V D Soleimani1, B R Baum, D A Johnson
1Agriculture and Agri-Food Canada, K. W. Neatby Building, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada.
Summary
Sequence-specific amplification polymorphism (S-SAP) analysis revealed significant genetic diversity within barley cultivars, uncovering cryptic variation not evident through traditional pedigree analysis. This highlights S-SAP
Area of Science:
- Plant genetics
- Molecular biology
- Agricultural science
Background:
- Barley (Hordeum vulgare L.) possesses a narrow genetic base, making genetic diversity studies crucial for crop improvement.
- Traditional pedigree analysis may not reveal all genetic variation within closely related cultivars.
- Retrotransposon-based markers offer powerful tools for exploring genetic diversity.
Purpose of the Study:
- To analyze the genetic structure and relationships among Canadian and US barley cultivars using S-SAP markers.
- To quantify within-cultivar genetic variation and assess its contribution to overall genetic structure.
- To compare marker-based groupings with agriculturally significant phenotypic traits.
Main Methods:
- Utilized sequence-specific amplification polymorphisms (S-SAPs) with primers from the BARE-1 retrotransposon and MseI.
- Analyzed 824 individual plants from 103 barley cultivars.
- Employed analysis of molecular variance (AMOVA), cluster analysis, and discriminant analysis.
Main Results:
- Identified 150 polymorphic bands out of 404 scored.
- Found that within-cultivar variation accounted for the largest component of genetic variance (69-86%).
- Cluster analysis grouped cultivars similarly to phenotypic traits (e.g., row number, type, hull presence, growth habit), with minor overlaps.
Conclusions:
- S-SAP markers, particularly those from retrotransposons like BARE-1, are effective for studying genetic diversity in barley.
- Significant cryptic genetic variation, including potential somaclonal variation, exists within barley cultivars.
- S-SAP analysis provides insights into genetic relationships and diversity beyond pedigree information.
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