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Nature. 2017 Sep 21;549(7672):379-383. doi: 10.1038/nature23897. Epub 2017 Sep 13.

The Apostasia genome and the evolution of orchids.

Author information

1
Shenzhen Key Laboratory for Orchid Conservation and Utilization, The National Orchid Conservation Center of China and The Orchid Conservation and Research Center of Shenzhen, Shenzhen 518114, China.
2
Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Gent, Belgium.
3
VIB Center for Plant Systems Biology, 9052 Gent, Belgium.
4
Orchid Research and Development Center, National Cheng Kung University, Tainan 701, Taiwan.
5
Department of Life Sciences, National Cheng Kung University, Tainan 701, Taiwan.
6
State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
7
College of Forestry, South China Agricultural University, Guangzhou 510640, China.
8
Technology Center, Taisei Corporation, Nase-cho 344-1, Totsuka-ku, Yokohama, Kanagawa 245-0051, Japan.
9
Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, Higashi 1-1-1, Tsukuba, Ibaraki 305-8562, Japan.
10
PubBio-Tech Services Corporation, Wuhan 430070, China.
11
Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan.
12
NARO Institute of Floricultural Science (NIFS), 2-1 Fujimoto, Tsukuba, Ibaraki 305-8519, Japan.
13
Institute of Tropical Plant Sciences, National Cheng Kung University, Tainan 701, Taiwan.
14
Department of Genetics, Genomics Research Institute, Pretoria 0028, South Africa.
15
College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
16
The Center for Biotechnology and BioMedicine, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.

Abstract

Constituting approximately 10% of flowering plant species, orchids (Orchidaceae) display unique flower morphologies, possess an extraordinary diversity in lifestyle, and have successfully colonized almost every habitat on Earth. Here we report the draft genome sequence of Apostasia shenzhenica, a representative of one of two genera that form a sister lineage to the rest of the Orchidaceae, providing a reference for inferring the genome content and structure of the most recent common ancestor of all extant orchids and improving our understanding of their origins and evolution. In addition, we present transcriptome data for representatives of Vanilloideae, Cypripedioideae and Orchidoideae, and novel third-generation genome data for two species of Epidendroideae, covering all five orchid subfamilies. A. shenzhenica shows clear evidence of a whole-genome duplication, which is shared by all orchids and occurred shortly before their divergence. Comparisons between A. shenzhenica and other orchids and angiosperms also permitted the reconstruction of an ancestral orchid gene toolkit. We identify new gene families, gene family expansions and contractions, and changes within MADS-box gene classes, which control a diverse suite of developmental processes, during orchid evolution. This study sheds new light on the genetic mechanisms underpinning key orchid innovations, including the development of the labellum and gynostemium, pollinia, and seeds without endosperm, as well as the evolution of epiphytism; reveals relationships between the Orchidaceae subfamilies; and helps clarify the evolutionary history of orchids within the angiosperms.

PMID:
28902843
DOI:
10.1038/nature23897
[Indexed for MEDLINE]

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