GENETIC RELATIONSHIPS AND PATTERNS OF ALLOZYMIC DIVERGENCE IN THE IPOMOPSIS AGGREGATA COMPLEX AND RELATED SPECIES (POLEMONIACEAE)
GENETIC RELATIONSHIPS AND PATTERNS OF ALLOZYMIC DIVERGENCE IN THE IPOMOPSIS AGGREGATA COMPLEX AND RELATED SPECIES (POLEMONIACEAE)
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IPOMOPSIS Aggregata 复合体及相关物种（Polemoniaceae）的遗传关系和同种异型分化模式
DOI：
10.1002/j.1537-2197.1991.tb15218.x
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发表时间：
1991
影响因子：
3
通讯作者：
D. Soltis
中科院分区：
文献类型：
--
作者：
P. Wolf;P. Soltis;D. Soltis
该Ipomopsis aggregatcomplex由二倍体，异交，多年生草本植物。本群在形态上变异很大，被分为三个种：I. aggregata，黄花蒿I. tenuituba和I. arizonica.地理种族。aggregataandI. tenuitubaare公认为亚种.应用酶电泳技术研究了聚叶牵牛复合体及其近缘种居群和类群间的遗传关系。来自60个群体的23个等位酶基因座的遗传数据也被用来确定遗传变异的地理分布。美国西南部的种群比西北部的种群更易变：遗传多样性的中心与物种多样性的中心相对应。等位酶数据没有提供与最近和快速分化相关的遗传变异丧失的证据。基于Nei遗传身份的遗传关系与分类学关系不一致。例如，两个种群。亚利桑那州和I.细管簇集于内。尽管种群间的遗传多样性水平相对较高，但类群间的多样性较低。结果表明，最近在Ipomopsis aggregataplex中发生了花分化和伴随的物种形成。等位酶模式也反映了花形态的趋同进化和可能的渐渗。尽管物种之间存在形态学差异，但中性或近中性等位酶位点的等位基因固定进化时间不足。
TheIpomopsis aggregatacomplex consists of diploid, outcrossing, perennial herbs. The group is highly variable morphologically and is treated as three species:I. aggregata, I. tenuituba, andI. arizonica.Geographic races ofI. aggregataandI. tenuitubaare recognized as subspecies. Enzyme electrophoresis was used to examine genetic relationships among populations and taxa in theIpomopsis aggregatacomplex and some related species. Genetic data for 23 allozyme loci from 60 populations were also used to determine how genetic variation is distributed geographically. Populations in the southwestern United States were more variable than those in the northwest: the center of genetic diversity corresponded to the center of species diversity. Allozymic data provided no evidence of loss of genetic variability associated with recent and rapid divergence. Genetic relationships based on Nei's genetic identity did not correspond to taxonomic relationships. For example, populations of bothI. arizonicaandI. tenuitubaclustered withinI. aggregata.Despite relatively high levels of genetic diversity among populations, diversity among taxa was low. Results indicated that floral divergence and concomitant speciation have occurred recently in theIpomopsis aggregatacomplex. Allozymic patterns also reflected convergent evolution for floral morphology and possible introgression. Despite morphological differences among species, insufficient evolutionary time has elapsed for allelic fixation at neutral or near‐neutral allozyme loci.