TITLE	Allozyme variation in Paraixeris: a test for the diploid hybrid origin of Paraixeris koidzumiana (Compositae)
AUTHOR	Ki-Ryong Park Department of Biology, Kyung-Nam University, 449 Wolyoung-dong, Masan 631-701, Korea Jae-Hong Pak Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu 702-701, Korea Bong-Bo Seo Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu 702-701, Korea
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ABSTRACT	Variation in isozyme patterns of four Korean Paraixeris species was used to test the hypothesis that P. koidzumiana is a hybrid derivative of P. chelidoniifolia and P. denticulata, or alternatively, of the progenitor P. chelidoniifolia-P. sonchifolia pair. Eleven loci from eight enzymes were examined for 29 populations of P. koidzumiana, P. denticulata, P. chelidoniifolia, and P. sonchifolia. Although recent RAPD and morphological data supported the hybrid origin of P. koidzumiana, isozyme evidence did not. No evidence of additivity was found in P. koidzumiana at the loci that significantly differentiate P. sonchifolia from other species. In addition, P. koidzumiana populations did not combine the marker alleles differentiating P. denticulata from P. chelidoniifolia. Recent divergence between P. koidzumiana and P. chelidoniifolia is strongly supported by the high genetic identity value and sharing of the same high frequency alleles at most loci. Our isozyme data largely support a conclusion that the unidentified individuals found in species sympatry are hybrid derivatives.
KEYWORD	Hybridization; Isozyme; Paraixeris koidzumiana;
ARTICLE INFO	Botanical Bulletin of Academia Sinica, Volume 44 Number 2 April 2003, page 113-122, 10 pages
PUBLISHER	Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China