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Abstract Detail


Pteridological Section/AFS

Kuo, Li-Yaung [1], Chiou, Wen-Liang [2], Wang, Chun-Neng [1].

The Origin of Polyploids in Deparia lancea and Deparia tomitaroana with Consideration of their Reproduction.

In previous phylogenetic analysis of rbcL, Deparia lancea (Thunb.) Fras.-Jenk. and Deparia tomitaroana (Masam.) R. Sano form a small monophyletic clade nested in the genus Deparia. The members of this clade are widespread in Asia area from Japan to India with a special cytogeographical distribution. Pentaploid and hexaploid of D. lancea were recorded in Japan, and tetraploid seemed most widespread ones which have been recorded in Japan, Taiwan, China, and Nepal. However, the diploids and triploids of D. lancea were only recorded in Taiwan. Unlike other cytotypes, the triploid and pentaploid of D. lancea were regarded as apogamous and sterile respectively. Another species of this clade, D. tomitaroana, including sterile tetraploid and pentaploid, were recorded in Japan, Ryukyus Islands, and Nepal respectively. It was also considered a hybrid between D. lancea and a member of Deparia sect. Athyriopsis, the sister group of D. lancea and D. tomitaroana. Further research in the origin of polyploids in this clade and its cytogeographical distribution are very important to understand its evolutionary history. Previous studies indicate that polyploidization and cytogeographical distribution of ferns correlate to their particular reproductive modes and mating systems. Therefore, in this study, we will examine if specific reproduction and cytotypes in these natural taxa play important roles in their geographical distribution and reticulate evolution, including polyploidization and hybridization. Phylogeny will be analyzed by cytological, reproductive, geographical, populational and genetic (chloroplast and nuclear analysis) studies. The aim of this study is to understand the significance of polyploids in these ferns' biogeographical distribution and to propose mechanism(s) of their evolution.


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1 - National Taiwan University, Department of Life Science, No. 1, Sec 4, Roosevelt Road, Taipei,, 106, Taiwan, ROC
2 - Taiwan Forestry Research Institute, 53 Nan-Hai Rd, Taipei, 100, Taiwan

Keywords:
ferns
polyploidization
reproduction
reticulate evolution
phylogeography
cytogeography
population genetics
Deparia.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P58004
Abstract ID:943


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