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Mol. Cells 2009; 27(5): 515-523

Published online May 31, 2009

https://doi.org/10.1007/s10059-009-0070-7

© The Korean Society for Molecular and Cellular Biology

Monophyly of the Family Desmoscolecidae(Nematoda, Demoscolecida) and Its Phylogenetic Position Inferred from 18S rDNA Sequences

Ui Wook Hwang, Eun Hwa Choi, Dong Sung Kim, Wilfrida Decraemer, and Cheon Young Chang

Received: October 20, 2009; Revised: March 2, 2009; Accepted: March 6, 2009

Abstract

To infer the monophyletic origin and phylogenetic relationships of the order Desmoscolecida, a unique and puzzling group of mainly free-living marine nematodes, we newly determined nearly complete 18S rDNA sequences for six marine desmoscolecid nematodes belonging to four genera (Desmoscolex, Greeffiella, Tricoma and Paratricoma). Based on the present data and those of 72 nematode species previously reported, the first molecular phylogenetic analysis focusing on Desmoscolecida was done by using neighbor joining (NJ), maximum parsimony (MP), maximum likelihood (ML) and Bayesian inference (BI) methods. All four resultant trees consistently and strongly supported that the family Desmoscolecidae forms a monophyletic group with very high node confidence values. The monophyletic clade of desmocolecid nematodes was placed as a sister group of the clade including some members of Monhysterida and Araeolaimida, Cyartonema elegans (Cyartonematidae) and Terschellingia longicaudata (Linhomoeidae) in all the analyses. However, the present phylogenetic trees do not show any direct attraction between the families Desmoscolecidae and Cyartonematidae. Within the monophyletic clade of the family Desmoscolecidae in all of the present phylogenetic trees, there were consistently observed two distinct subgroups which correspond to the subfamilies Desmoscolecinae [Greeffiella sp. ? Desmoscolex sp.] and Tricominae [Pa-ratricoma sp. ? Tricoma sp].

Keywords 18S rDNA, Desmoscolecidae, molecular phylogeny, Nematoda

Article

Research Article

Mol. Cells 2009; 27(5): 515-523

Published online May 31, 2009 https://doi.org/10.1007/s10059-009-0070-7

Copyright © The Korean Society for Molecular and Cellular Biology.

Monophyly of the Family Desmoscolecidae(Nematoda, Demoscolecida) and Its Phylogenetic Position Inferred from 18S rDNA Sequences

Ui Wook Hwang, Eun Hwa Choi, Dong Sung Kim, Wilfrida Decraemer, and Cheon Young Chang

Received: October 20, 2009; Revised: March 2, 2009; Accepted: March 6, 2009

Abstract

To infer the monophyletic origin and phylogenetic relationships of the order Desmoscolecida, a unique and puzzling group of mainly free-living marine nematodes, we newly determined nearly complete 18S rDNA sequences for six marine desmoscolecid nematodes belonging to four genera (Desmoscolex, Greeffiella, Tricoma and Paratricoma). Based on the present data and those of 72 nematode species previously reported, the first molecular phylogenetic analysis focusing on Desmoscolecida was done by using neighbor joining (NJ), maximum parsimony (MP), maximum likelihood (ML) and Bayesian inference (BI) methods. All four resultant trees consistently and strongly supported that the family Desmoscolecidae forms a monophyletic group with very high node confidence values. The monophyletic clade of desmocolecid nematodes was placed as a sister group of the clade including some members of Monhysterida and Araeolaimida, Cyartonema elegans (Cyartonematidae) and Terschellingia longicaudata (Linhomoeidae) in all the analyses. However, the present phylogenetic trees do not show any direct attraction between the families Desmoscolecidae and Cyartonematidae. Within the monophyletic clade of the family Desmoscolecidae in all of the present phylogenetic trees, there were consistently observed two distinct subgroups which correspond to the subfamilies Desmoscolecinae [Greeffiella sp. ? Desmoscolex sp.] and Tricominae [Pa-ratricoma sp. ? Tricoma sp].

Keywords: 18S rDNA, Desmoscolecidae, molecular phylogeny, Nematoda

Mol. Cells
Sep 30, 2022 Vol.45 No.9, pp. 603~672
COVER PICTURE
The Target of Rapamycin Complex (TORC) is a central regulatory hub in eukaryotes, which is well conserved in diverse plant species, including tomato (Solanum lycopersicum). Inhibition of TORC genes (SlTOR, SlLST8, and SlRAPTOR) by VIGS (virus-induced gene silencing) results in early fruit ripening in tomato. The red/ orange tomatoes are early-ripened TORC-silenced fruits, while the green tomato is a control fruit. Top, left, control fruit (TRV2-myc); top, right, TRV2-SlLST8; bottom, left, TRV2-SlTOR; bottom, right, TRV2-SlRAPTOR(Choi et al., pp. 660-672).

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