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Abstract Detail

Systematics/Phytogeography / Taxonomie/ Section

Su, Yingjuan [1], Wang, Ting [2].

Euryodendron and Apterosperma: evidences from cpDNA trnL-F and atpB-rbcL noncoding sequences.

Euryodendron and Apterosperma, monotypic genus in Theaceae, are endemic and rarely restricted distributed to southern China. The systematic positions of the genera Euryodendron and Apterosperma were inferred using combined data set of chloroplast DNA trnL-F and atpB-rbcL noncoding sequences. Fifty-nine taxa were sampled to represent the two subfamilies and 11 genera of Theaceae. Incongruence length difference (ILD) test revealed congruence between trnL-F and atpB-rbcL data sets with a p value of 0.69. Including gaps as missing data and ¡°simple indel coding¡± resulted in the same better-resolved topology tree respectively using ML, however, there were differences using MP. Due to no good resolution for relationships and high bootstrap support values, therefore, the gaps were treated as missing data in the study. Bayes, maximum parsimony and maximum likelihood analyses were conducted to infer the placements of Euryodendron and Apterosperma. The aligned, combined trnL-F and atpB-rbcL sequences contained 1980 base pairs, of which 111 (5.6%) variable characters were parsimony-uninformative whereas 182 (9.2%) were parsimony-informative. The K81+G evolutionary model was determined by using Modeltest 3.7 under the Hierarchical Likelihood Test (hLRT) and the Akaike Information Criterion (AIC). Bayesian analysis produced the same topology as the ML analysis did. There was no conflict between the Bayesian analysis and clades supported by MP. Base differences (transition / transversion) and Kimura¡¯s genetic distance between different species were calculated using the program MEGA. Results consistently show that (i) Euryodendron is a valid genus, which is close to the genera Cleyera and Eurya, and (ii) Apterosperma is a member of the tribe Theeae along with Pyrenaria and Camellia, rather than close to Schima.
Supported by National Natural Science Foundation of China (Grant no.: 30271094)

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1 - Sun Yat-sen University, Biochemistry Department, Xingang Xi Road 135, Guangzhou, Guangdong, 510275, China
2 - Wuhan Botanical Garden, the Chinese Academy of Science, Wuhan Moshan, Wuhan, Hubei, 430074, China

systematic position.

Presentation Type: Oral Paper:Papers for Sections
Session: 16
Location: Room 3/Woodward
Date: Monday, July 28th, 2008
Time: 2:00 PM
Number: 16005
Abstract ID:278

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