Florideophycean red algal phylogeny and divergence time.

Title
Florideophycean red algal phylogeny and divergence time.
Author(s)
양은찬; 부성민; 윤환수
KIOST Author(s)
Yang, Eun Chan(양은찬)
Publication Year
2016-09-29
Abstract
The Florideophyceae is the most abundant and taxonomically diverse group (more than 6,700 spp) of Rhodophyta, consisting five subclasses, i.e., Ahnfeltiophycidae, Corallinophycidae, Hildenbrandiophycidae, Nemaliophycidae, and Rhodymeniophycidae. However, many aspects of the systematics (i.e., diversity, phylogeny and taxomony) and divergence times of the group remain uncovered. In present study, we used a seven-gene concatenated dataset (nDNA EF2, LSU and SSU rRNAs, mtDNA cox1,
 and ptDNA rbcL, psaA and psbA genes) and generated a robust phylogeny. Our results provide robust estimates for the divergence times of major lineages within the Florideophyceae. New multigene relaxed molecular clock analyses suggest that the Florideophyceae and Bangiophyceae diverged from MRCA approximately 943 ±57 million years ago (Ma with 817– 1,049 Ma 95% confidence intervals, CI). The major divergences in the class involved the emergence of Hildenbrandiophycidae [ca. 781 ±48 (CI: 681– 879) Ma], Nemaliophycidae [ca. 661 ±34 (CI: 597– 736) Ma], Corallinophycidae [ca. 579 ±18 (CI: 543– 617) Ma], and the split of Ahnfeltiophycidae and Rhodymeniophycidae [ca. 508 ±34 (CI: 442– 580) Ma]. Divergences within the Florideophyceae were accompanied by complete triphasic life cycle and subsequeces change in the cell-to-cell fusion mechanisms, leading to a successful strategy for millions of spore production from idae. However, many aspects of the systematics (i.e., diversity, phylogeny and taxomony) and divergence times of the group remain uncovered. In present study, we used a seven-gene concatenated dataset (nDNA EF2, LSU and SSU rRNAs, mtDNA cox1,
 and ptDNA rbcL, psaA and psbA genes) and generated a robust phylogeny. Our results provide robust estimates for the divergence times of major lineages within the Florideophyceae. New multigene relaxed molecular clock analyses suggest that the Florideophyceae and Bangiophyceae diverged from MRCA approximately 943 ±57 million years ago (Ma with 817– 1,049 Ma 95% confidence intervals, CI). The major divergences in the class involved the emergence of Hildenbrandiophycidae [ca. 781 ±48 (CI: 681– 879) Ma], Nemaliophycidae [ca. 661 ±34 (CI: 597– 736) Ma], Corallinophycidae [ca. 579 ±18 (CI: 543– 617) Ma], and the split of Ahnfeltiophycidae and Rhodymeniophycidae [ca. 508 ±34 (CI: 442– 580) Ma]. Divergences within the Florideophyceae were accompanied by complete triphasic life cycle and subsequeces change in the cell-to-cell fusion mechanisms, leading to a successful strategy for millions of spore production from
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/40813
Bibliographic Citation
제30회 한국조류학회 학술발표대회 및 국제심포지엄, pp.49, 2016
Publisher
한국조류학회
Type
Conference
Language
English
Publisher
한국조류학회
Related Researcher
Research Interests

Algae,Systematics,Ecology,조류,계통,생태

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