Kuo, Li-Yaung , Chiou, Wen-Liang , Wang, Chun-Neng .
Cytogeography and Polyploidy Evolution in Deparia lancea group.
Deparia lancea group comprising Deparia lancea (Thunb.) Fras.-Jenk. and Deparia tomitaroana (Masam.) R. Sano (Woodsiaceae) is particularly interesting in that there were five cytotypes, from diploid to hexaploid, being found, and they were widespread in East Asia. However, little was known about their biogeography related to their evolution of polyploidization. To reveal these relationships, cytogeography and molecular phylogenetic studies were carried out.
In our study, polyploids were found in Japan, Taiwan, China and Nepal, while diploid, the ancestral cytotype, was found only in Taiwan. Besides, Taiwan is considered being the highest diversity region hosting most cytotypes and haplotypes (trnL-F region). It reasonable to suspect these polyploids were originated from Taiwan, the only region with diploids, and further cytological studies are undertaking to confirm this idea. As fern polyploids are usually considered with low inbreeding depression and thus are more capable of establishing new population, our cytogeographical study on Deparia lancea group also implies similar mechanism. It appears that polyploidy D. lancea group had been selected for advantage of long distance dispersal by discontinuity of island series between Taiwan and flanking islands, and further outspread from Taiwan.
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1 - National Taiwan University, Department of Life Science, No. 1, Sec 4, Roosevelt Road, Taipei, 106, Taiwan
2 - Taiwan Forestry Research Institute, 53 Nan-Hai Rd, Taipei, 100, Taiwan
long distance dispersal
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM