The pattern of genetic variability in apomictic clones of Taraxacum officinale indicates the alternation of asexual and sexual histories of apomicts.
The pattern of genetic variability in apomictic clones of Taraxacum officinale indicates the alternation of asexual and sexual histories of apomicts.
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DOI：
10.1371/journal.pone.0041868
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Trávníček B
中科院分区：
文献类型：
--
作者：
Majeský L;Vašut RJ;Kitner M;Trávníček B
蒲公英属植物包括一组有性二倍体和无融合生殖多倍体，具有复杂的网状进化。无融合生殖（通过种子的克隆繁殖）在该属被认为是专性的，因此代表了一个很好的模型，研究无性生殖的无融合生殖属的微进化过程中的作用。在我们的研究中，共有187个无融合生殖的个人组成的一组9个微种（在欧洲广泛的地理区域采样）的基因型为6个微卫星位点和162扩增片段长度多态性（AFLP）标记。研究结果表明，基因型较少的材料间存在显著的遗传相似性。基因型变异是高之间加入，但加入内低。聚类方法将个体分为9组，对应于它们的表型。此外，观察到两组无融合生殖基因型，这表明它们有不同的无性生殖历史。基质相容性试验表明，加入组内的大部分变异性来源于突变。然而，也检测到重组的存在。无性克隆中突变的积累导致了克隆配偶网络的建立。然而，这项研究表明，克隆主要来源于有性生殖和无融合生殖之间的杂交。
Dandelions (genus Taraxacum) comprise a group of sexual diploids and apomictic polyploids with a complicated reticular evolution. Apomixis (clonal reproduction through seeds) in this genus is considered to be obligate, and therefore represent a good model for studying the role of asexual reproduction in microevolutionary processes of apomictic genera. In our study, a total of 187 apomictic individuals composing a set of nine microspecies (sampled across wide geographic area in Europe) were genotyped for six microsatellite loci and for 162 amplified fragment length polymorphism (AFLP) markers. Our results indicated that significant genetic similarity existed within accessions with low numbers of genotypes. Genotypic variability was high among accessions but low within accessions. Clustering methods discriminated individuals into nine groups corresponding to their phenotypes. Furthermore, two groups of apomictic genotypes were observed, which suggests that they had different asexual histories. A matrix compatibility test suggests that most of the variability within accession groups was mutational in origin. However, the presence of recombination was also detected. The accumulation of mutations in asexual clones leads to the establishment of a network of clone mates. However, this study suggests that the clones primarily originated from the hybridisation between sexual and apomicts.
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影响因子：
4.9
作者：
Brookfield, J. F. Y.
通讯作者：
Brookfield, J. F. Y.
DOI：
10.1111/j.1471-8286.2006.01380.x
发表时间：
2006-09-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Ehrich, Dorothee
通讯作者：
Ehrich, Dorothee
影响因子：
3.7
作者：
Drummond EB;Vellend M
通讯作者：
Vellend M
影响因子：
7.7
作者：
Excoffier, Laurent;Lischer, Heidi E. L.
通讯作者：
Lischer, Heidi E. L.
影响因子：
4.9
作者：
Ehrich, Dorothee;Gaudeul, Myriam;Brochmann, Christian
通讯作者：
Brochmann, Christian