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Title: Rappemonads are haptophyte phytoplankton
Authors: Kawachi, Masanobu
Nakayama, Takuro
Kayama, Motoki
Nomura, Mami
Miyashita, Hideaki  kyouindb  KAKEN_id
Bojo, Othman
Rhodes, Lesley
Sym, Stuart
Pienaar, Richard N.
Probert, Ian
Inouye, Isao
Kamikawa, Ryoma  kyouindb  KAKEN_id
Author's alias: 河地, 正伸
中山, 卓郎
加山, 基
野村, 真未
宮下, 英明
井上, 勲
神川, 龍馬
Keywords: phytoplankton diversity
environmental DNA sequences
morphological evolution
organellar phylogenomics
transmission electron microscopy
Issue Date: Jun-2021
Publisher: Elsevier BV
Journal title: Current Biology
Volume: 31
Issue: 11
Start page: 2395
End page: 2403
Thesis number: e4
Abstract: Rapidly accumulating genetic data from environmental sequencing approaches have revealed an extraordinary level of unsuspected diversity within marine phytoplankton, which is responsible for around 50% of global net primary production.However, the phenotypic identity of many of the organisms distinguished by environmental DNA sequences remains unclear. The rappemonads represent a plastid-bearing protistan lineage that to date has only been identified by environmental plastid 16S rRNA sequences.The phenotypic identity of this group, which does not confidently cluster in any known algal clades in 16S rRNA phylogenetic reconstructions, has remained unknown since the first report of environmental sequences over two decades ago. We show that rappemonads are closely related to a haptophyte microalga, Pavlomulina ranunculiformis gen. nov. et sp. nov., and belong to a new haptophyte class, the Rappephyceae. Organellar phylogenomic analyses provide strong evidence for the inclusion of this lineage within the Haptophyta as a sister group to the Prymnesiophyceae. Members of this new class have a cosmopolitan distribution in coastal and oceanic regions. The relative read abundance of Rappephyceae in a large environmental barcoding dataset was comparable to, or greater than, those of major haptophyte species, such as the bloom-forming Gephyrocapsa huxleyi and Prymnesium parvum, and this result indicates that they likely have a significant impact as primary producers. Detailed characterization of Pavlomulina allowed for reconstruction of the ancient evolutionary history of the Haptophyta, a group that is one of the most important components of extant marine phytoplankton communities.
Description: 20年以上謎だった生物の正体が判明 --光合成生物進化解明のカギに--. 京都大学プレスリリース. 2021-03-29.
Rights: © 2021 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license.
DOI(Published Version): 10.1016/j.cub.2021.03.012
PubMed ID: 33773100
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