Atlas of telomeric repeat diversity in Arabidopsis thaliana.

Background: Telomeric repeat arrays at the ends of chromosomes are highly dynamic in composition, but their repetitive nature and technological limitations have made it difficult to assess their true variation in genome diversity surveys.

Results: We have comprehensively characterized the sequence variation immediately adjacent to the canonical telomeric repeat arrays at the very ends of chromosomes in 74 genetically diverse Arabidopsis thaliana accessions. We first describe several types of distinct telomeric repeat units and then identify evolutionary processes such as local homogenization and higher-order repeat formation that shape diversity of chromosome ends.

Genome-Wide Evidence for Complex Hybridization and Demographic History in a Group of From China.

Cycads represent one of the most ancestral living seed plants as well as one of the most threatened plant groups in the world. South China is a major center and potential origin of , the most rapidly diversified lineage of cycads. However, genomic-wide diversity of remains poorly understood due to the challenge of generating genomic markers associated with their inherent large genomes.