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Phylogeny and genetic structure in the genus Secale
Öncü Maraci1,2,3, Hakan Özkan4, Raşit Bilgin3
1Department of Animal Behaviour, Bielefeld University, Bielefeld, Germany.
Plos One
|July 20, 2018
Summary
Genetic diversity in the Secale genus, including cultivated rye, was analyzed. Perennial subspecies are distinct, while annuals show Asian and non-Asian clusters, with Middle Eastern landraces holding key genetic resources.
Area of Science:
- Plant genetics
- Agronomy
- Evolutionary biology
Background:
- The Secale genus, encompassing cultivated rye, is vital but its genetic diversity patterns and influencing factors are not fully understood.
- Understanding genetic variation is crucial for crop improvement and conservation.
Purpose of the Study:
- To analyze population structure and genetic variation within the Secale genus.
- To investigate correlations between genetic diversity, taxonomy, cultivation status, geography, and climate.
- To identify key genetic resources for cultivated rye.
Main Methods:
- Investigated 726 individuals from 139 accessions of Secale species using SSR analysis.
- Conducted sequence diversity analysis of a nuclear EST region.
- Analyzed population structure and genetic variation distribution.
Main Results:
- Perennial Secale strictum subspecies are genetically distinct from annual forms.
- Annual Secale taxa formed two clusters: Asian and non-Asian, with evidence of introgression.
- Cultivated rye landraces from the Middle East exhibit the highest genetic diversity.
Conclusions:
- The Middle East is likely the center of origin for cultivated rye.
- Middle Eastern landraces represent crucial genetic reservoirs for future breeding and adaptation.
- Genetic diversity patterns are influenced by perennial vs. annual life cycles and geographic distribution.
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