Polyploidy and Speciation in Pteris PteridaceaeReport as inadecuate




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Journal of BotanyVolume 2012 2012, Article ID 817920, 7 pages

Review Article

Department of Biological Sciences, National Sun Yat-Sen University, Kaohsiung 804, Taiwan

Division of Botanical Garden, Taiwan Forestry Research Institute, Taipei 100, Taiwan

Received 6 June 2011; Revised 19 December 2011; Accepted 6 January 2012

Academic Editor: Kang Chong

Copyright © 2012 Yi-Shan Chao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The highest frequency of polyploidy among plants is considered to occur in the Pteridophytes. In this study, we focused on polyploidy displayed by a specific fern taxon, the genus Pteris L. Pteridaceae, comprising over 250 species. Cytological data from 106 Pteris species were reviewed. The base number of chromosomes in Pteris is 29. Polyploids are frequently found in Pteris, including triploids, tetraploids, pentaploids, hexaploids, and octoploids. In addition, an aneuploid species, P. deltodon Bak., has been recorded. Furthermore, the relationship between polyploidy and reproductive biology is reviewed. Among these 106 Pteris species, 60% exhibit polyploidy: 22% show intraspecific polyploidy and 38% result from polyploid speciation. Apogamous species are common in Pteris. Diploids are the most frequent among Pteris species, and they can be sexual or apogamous. Triploids are apogamous; tetraploids are sexual or apogamous. Most Pteris species have one to two ploidy levels. The diverse ploidy levels suggest that these species have a complex evolutionary history and their taxonomic problems require further clarification.





Author: Yi-Shan Chao, Ho-Yih Liu, Yu-Chung Chiang, and Wen-Liang Chiou

Source: https://www.hindawi.com/



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