JEB logo

Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

About Journal
    Editorial Board
    Reviewer Panel
    RnD Division
    Subscription Info
    Contact Journal
 
Read Journal
    Current Issue
    Journal Archives
 
For Authors
    Authoring Guidelines
    Publication Process
    Track Paper Status
 

Search the Journal web-site through Google:


        Abstract - Issue Jul 2008, 29 (4)                                                                                                             Back



Abstract

Taxonomic re-appraisal of Antithamnion sparsum Tokida (Ceramiaceae, Rhodophyta)

Gwang Hoon Kim*1, He Kyong Han1 and Kook Jin Lim2

1Department of Biology, Kongju National University, Kongju, Chungnam 314-701, Korea
2LG Life Sciences, Ltd., LG Twin Tower, 20 Yoido-dong, Youngdungpo-gu, Seoul 150-721, Korea

(Received: February 14, 2007; Revised received: February 20, 2008; Accepted: March 03, 2008)

Abstract: The taxonomic criterion of Antithamnion sparsum was re-appraised in comparison with A. densum and A. defectum based on crossing experiments, morphological observation, chromosome study, and Random Amplified Polymorphic DNA (RAPD) analysis. These species had a very similar morphology, but were sexually isolated. The chromosome number was n = ca. 24 for A. densum, n = ca. 21 for A. defectum, and n = ca. 44 for A. sparsum. All isolates of A. sparsum and A. densum showed polysiphonia-type life history. Asexual reproduction was induced by favorable environmental conditions. In A. sparsum, 1-2% of male plants developed mitotic tetrasporangia together with spermatangia. In A. densum, 5-10% of tetraspores developed into asexual tetrasporophytes. Phylogenetic relationships between these species were examined using RAPD analysis, and A. glanduliferum was used as an outgroup. A total of 167 polymorphic RAPD markers amplified from 15 different primers were analyzed. Results suggested that these species were closely related, with A. defectum placed in the middle of A. sparsum and A. densum. Chromosome study and RAPD analysis implied that A. sparsum first separated from A. defectum through polyploidization and later A. densum evolved. These species may present another example of the narrow species concept in the genus Antithamnion.

Key words: Antithamnion sparsum, Chromosome, Polyploidization, RAPD analysis, Taxonomy

PDF of full length paper is available with author (ghkim@kongiu.ac.kr)

 

Copyright ? 2008 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission. Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).