Micro-collinearity and genome evolution in the vicinity of an ethylene receptor gene of cultivated diploid and allotetraploid coffee species (Coffea)

The Plant Journal : for Cell and Molecular Biology
Qingyi YuR Ming

Abstract

Arabica coffee (Coffea arabica L.) is a self-compatible perennial allotetraploid species (2n=4x=44), whereas Robusta coffee (C. canephora L.) is a self-incompatible perennial diploid species (2n=2x=22). C. arabica (C(a) C(a) E(a) E(a) ) is derived from a spontaneous hybridization between two closely related diploid coffee species, C. canephora (CC) and C. eugenioides (EE). To investigate the patterns and degree of DNA sequence divergence between the Arabica and Robusta coffee genomes, we identified orthologous bacterial artificial chromosomes (BACs) from C. arabica and C. canephora, and compared their sequences to trace their evolutionary history. Although a high level of sequence similarity was found between BACs from C. arabica and C. canephora, numerous chromosomal rearrangements were detected, including inversions, deletions and insertions. DNA sequence identity between C. arabica and C. canephora orthologous BACs ranged from 93.4% (between E(a) and C(a) ) to 94.6% (between C(a) and C). Analysis of eight orthologous gene pairs resulted in estimated ages of divergence between 0.046 and 0.665 million years, indicating a recent origin of the allotetraploid species C. arabica. Analysis of transposable elements revealed differen...Continue Reading

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Related Concepts

Genome
Nucleic Acid Hybridization Procedure
Hormone Receptors, Cell Surface
Bacterial Artificial Chromosomes
Retrotransposons
Coffea arabica (Plant)
Coffea canephora Plant
Sequencing
Sequence Determinations, DNA
Chromosomes

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