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The pineapple genome and the evolution of CAM photosynthesis
Wai, Ching M.
Schatz, Michael C.
Bowers, John E.
Yim, Won C.
Priest, Henry D.
Edger, Patrick P.
Sedlazeck, Fritz J.
McKain, Michael R.
Hernandez, Alvaro G.
Wright, Chris L.
Tuskan, Gerald A.
Moore, Paul H.
Leebens-Mack, James H.
Bennetzen, Jeffrey L.
Paterson, Andrew H.
Smith, J. Andrew C.
Cushman, John C.
Paull, Robert E.
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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. duplication event. The pineapple lineage has transitioned from C-3 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.
|Journal Title||Nature Genetics|
|Rights||Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported|
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