Abstract
Pineapple (Ananas comosus (L.) Merr.) is the most economically valuable crop possessing crassulacean acid metabolism (CAM), a photosynthetic carbon assimilation pathway with high water-use efficiency, and the second most important tropical fruit. We sequenced the genomes of pineapple varieties F153 and MD2 and a wild pineapple relative, Ananas bracteatus accession CB5. The pineapple genome has one fewer ancient whole-genome duplication event than sequenced grass genomes and a conserved karyotype with seven chromosomes from before the ρ duplication event. The pineapple lineage has transitioned from C3 photosynthesis to CAM, with CAM-related genes exhibiting a diel expression pattern in photosynthetic tissues. CAM pathway genes were enriched with cis-regulatory elements associated with the regulation of circadian clock genes, providing the first cis-regulatory link between CAM and circadian clock regulation. Pineapple CAM photosynthesis evolved by the reconfiguration of pathways in C 3 plants, through the regulatory neofunctionalization of preexisting genes and not through the acquisition of neofunctionalized genes via whole-genome or tandem gene duplication.
Original language | English |
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Pages (from-to) | 1435-1442 |
Number of pages | 8 |
Journal | Nature Genetics |
Volume | 47 |
Issue number | 12 |
DOIs | |
State | Published - Nov 2015 |
Keywords
- Ananas/genetics
- Chromosome Mapping
- Epigenomics
- Evolution, Molecular
- Gene Expression Regulation, Plant
- Gene Regulatory Networks
- Genetic Markers
- Genome, Plant
- Genomics/methods
- High-Throughput Nucleotide Sequencing/methods
- Photosynthesis/physiology