萵苣(Paraixeris)同功異構酶的變化：Paraixeris koidzumiana二倍體雜交種源的分析

Allozyme variation in Paraixeris: a Test for the Diploid Hybrid Origin of Paraixeris Koidzumiana (Compositae)

Ki-Ryong Park ； Jae-Hong Pak ； Bong-Bo Seo

《Botanical Bulletin of Academia Sinica》 44卷2期 (2003/04) Pp. 113-122

https://doi.org/10.7016/BBAS.200304.0113

摘要

Paraixeris koidzumiana是P.chelidoniifolia和P.denticulate或P.chalidoniifolia-P.sonchifolia配對祖先的雜交物種，以這四種韓國萵苣的同功異構瓷型態的變化當做是試驗的假說。從P.koidzumiana,P.denticulate,P.chelidoniifolia和P.sonchifolia的29個樣品檢視八個酵素其在十一個基因座中。雖然最近在P.koidzumiana和型態學和資料支持種源為P.koidcumiana,但是在同功異構瓷的證據卻不是這樣。沒有證據顯示在P.koidcumiana和P.sonc hifolia的基因座有差異，且P.koidzumiana中沒有增加不同的標誌對偶基因與P.denticulate和P.chelidoniifolia。近來有強烈證據顯示P.chelidoniifolia和P.koidzumiana的相異，因為有高度的遺傳一致性和大部分的基因座中有高頻率的對偶基因。我們的同功異構瓷的資料支持這個結論是未被認出且獨特的發現，在同一地區物種內並存但不會雜交而成混合種要認為是雜交的衍生。

關鍵字

雜交 ； 同功異構瓷 ； Paraixeris koidzumiana

並列摘要

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, and 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 F. 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. denliculata from F. 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.

並列關鍵字

Hybridization ； Isozyme ； Paraixeris koidzumiana.