The genome sequence of the orchid Phalaenopsis equestris

Cai Jing, Vanneste Kevin, Proost Sebastian, Tsai Wen-Chieh, Liu Ke-Wei, Chen Li-Jun, He Ying, Xu Qing, Bian Chao, Zheng Zhijun, Sun Fengming, Liu Weiqing, Hsiao Yu-Yun, Pan Zhao-Jun, Hsu Chia-Chi, Yang Ya-Ping, Hsu Yi-Chin, Chuang Yu-Chen, Diévart Anne, Dufayard Jean-François, Xu Xun, Wang Juhui, Wang Jung, Xiao Xin-Ju, Zhao Xue-Min, Du Rong, Zhang Guo-Qiang, Wang Meina, Su Yong-Yu, Xie Gao-Chang, Liu Guo-Hui, Li Li-Qiang, Huang Lai-Qiang, Luo Yi-Bo, Chen Hong-Hwa, Van de Peer Yves, Liu Zhong-Jian. 2015. The genome sequence of the orchid Phalaenopsis equestris. Nature Genetics, 47 (1) : 65-74.

https://doi.org/10.1038/ng.3149

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Quartile : Outlier, Sujet : GENETICS & HEREDITY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Orchidaceae, renowned for its spectacular flowers and other reproductive and ecological adaptations, is one of the most diverse plant families. Here we present the genome sequence of the tropical epiphytic orchid Phalaenopsis equestris, a frequently used parent species for orchid breeding. P. equestris is the first plant with crassulacean acid metabolism (CAM) for which the genome has been sequenced. Our assembled genome contains 29,431 predicted protein-coding genes. We find that contigs likely to be underassembled, owing to heterozygosity, are enriched for genes that might be involved in self-incompatibility pathways. We find evidence for an orchid-specific paleopolyploidy event that preceded the radiation of most orchid clades, and our results suggest that gene duplication might have contributed to the evolution of CAM photosynthesis in P. equestris. Finally, we find expanded and diversified families of MADS-box C/D-class, B-class AP3 and AGL6-class genes, which might contribute to the highly specialized morphology of orchid flowers.

Mots-clés Agrovoc : génome, génomique, photosynthèse, gène, voie du métabolisme cam, Orchidaceae, Phalaenopsis

Mots-clés géographiques Agrovoc : France

Classification Agris : F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

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