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Abstract Detail


Systematics Section/ASPT

Kim, Jungsung [1], Kim, Joo-Hwan [1].

Rearrangement of plastid genome among seven orders of monocots and its phylogenetic implication.

Monocots are one of the major radiations of angiosperms comprise of approximately 61,000 species in 78-80 families and11 orders which are one of the most diverse, morphologically varied,ecologically successful, and economically important clades of angiosperms. Although many molecular phylogenetic studies led to a remarkable reclassification and understanding of relationships within and among the orders, there are still remain many relationships with weakly supported among orders as well as families. We performed phylogenetic analyses of 79 plastid coding genes in 18representative monocots plastid genomes including Lililum of Lililaes, which is firstly analyzed in the present study, and compare the genome structure among them. The complete plastid genome sequence of Lilium longiflorum (Liliaceae, Liliales) was defined. It was152,789bp in length composed of LSC region of 82,226bp, two IR copies of 26,481bp,and SSC region of 17,601bp. It showed 37.02% of G+C contents. It had totally141 predicted coding regions, 93 of which were different and 24 were duplicated in the IR. The coding regions included 47 protein coding genes, 38 transfer RNAs, 4 duplicated ribosomal RNAs and 26 ribosomal proteins. And two ORFs,ORF42 and ORF56 were found within introns of trnI-GAU located in IR regions.Phylogenetic analyses were performed on 23 taxa using 79 protein coding genes data matrix with 98,424 aligned nucleotide sequences. Tree topology of Maximum-likelihood and Bayesian inference analysis tree was identical and their branch supporting values were very similar, however,. Monocots were monophyletic with strong support value, and Acorales was positioned in the basal clade within monocots. Alismatales and Dioscoreales were subsequently divergent. Liliales was a sister of Asparagales although it was weakly supported. Within commelinids group, Arecales was a sister of Poales clade and Thypa was located in the basal position of Poales. We found two types of rearrangement in LSC of Poales excluding Thypa and Liliales and whole inversionin SSC of Dioscoreales. And we also confirmed that very similar structure in internal IR region although their boundaries were varied among the orders.

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1 - Gachon University, Dept Of Life Science, 1342 Seongnam-daero, Bokjeong-dong, Sujeong-gu, Seongnam, Gyeonggi-do, N/A, 461-701, Korea

Keywords:
Monocots
Plastid genome
Liliales
Rearrangement.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM
Number: PSY032
Abstract ID:419


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