The nature of intraspecific and interspecific genome size variation in taxonomically complex eyebrights.
The nature of intraspecific and interspecific genome size variation in taxonomically complex eyebrights.
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DOI：
10.1093/aob/mcab102
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发表时间：
2021-09-07
期刊：
影响因子：
4.2
通讯作者：
Twyford AD
中科院分区：
文献类型：
--
作者：
Becher H;Powell RF;Brown MR;Metherell C;Pellicer J;Leitch IJ;Twyford AD
基因组大小在不同种类的植物中差异很大。虽然根据定义，基因组大小受基因存在/缺失变异的影响，这在群体测序研究中普遍存在，但基因组大小通常被视为物种的内在属性。在此，我们研究了分类复杂的英国眼亮（Euphrasia, Orobanchaceae）的种内和种间基因组大小的变化。我们的目标是记录基因组大小的多样性，并研究形成个体、种群和物种之间差异的潜在进化过程。对192个二倍体和四倍体胡杨的基因组大小进行了分析，并分析了基因组大小与倍性、分类、种群归属和地理的关系。我们进一步比较了30个样本的基因组重复序列含量。我们发现了相当大的种内基因组大小差异，并观察了异交二倍体基因组大小的距离隔离。四倍体欧亚蓟的基因组大小随纬度的增加而增加，而高度自交的薇甘菊的基因组大小变化不大。基因组大小和重复序列的基因组比例的种间差异很小。我们展示了将基因组大小作为多基因变异结果的效用。像其他类型的遗传变异一样，如单核苷酸多态性，基因组大小的变异可能受到正在进行的杂交和群体细分程度的影响。除了对相关性状的选择外，由于存在/缺失变异的多效性选择，预计基因组大小也会间接受到影响。
Genome size varies considerably across the diversity of plant life. Although genome size is, by definition, affected by genetic presence/absence variants, which are ubiquitous in population sequencing studies, genome size is often treated as an intrinsic property of a species. Here, we studied intra- and interspecific genome size variation in taxonomically complex British eyebrights (Euphrasia, Orobanchaceae). Our aim is to document genome size diversity and investigate underlying evolutionary processes shaping variation between individuals, populations and species. We generated genome size data for 192 individuals of diploid and tetraploid Euphrasia and analysed genome size variation in relation to ploidy, taxonomy, population affiliation and geography. We further compared the genomic repeat content of 30 samples. We found considerable intraspecific genome size variation, and observed isolation-by-distance for genome size in outcrossing diploids. Tetraploid Euphrasia showed contrasting patterns, with genome size increasing with latitude in outcrossing Euphrasia arctica, but with little genome size variation in the highly selfing Euphrasia micrantha. Interspecific differences in genome size and the genomic proportions of repeat sequences were small. We show the utility of treating genome size as the outcome of polygenic variation. Like other types of genetic variation, such as single nucleotide polymorphisms, genome size variation may be affected by ongoing hybridization and the extent of population subdivision. In addition to selection on associated traits, genome size is predicted to be affected indirectly by selection due to pleiotropy of the underlying presence/absence variants.
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在一个孤立的岛屿上维持密切相关的四倍体寄生虫（Orobanchaceae）的物种差异。
影响因子：
10.5
作者：
Becher H;Brown MR;Powell G;Metherell C;Riddiford NJ;Twyford AD
通讯作者：
Twyford AD
DOI：
10.1111/nph.12247
发表时间：
2013-07
期刊：
The New phytologist
影响因子：
--
作者：
Díez CM;Gaut BS;Meca E;Scheinvar E;Montes-Hernandez S;Eguiarte LE;Tenaillon MI
通讯作者：
Tenaillon MI
影响因子：
4.5
作者：
Bilinski, Paul;Albert, Patrice S.;Ross-Ibarra, Jeffrey
通讯作者：
Ross-Ibarra, Jeffrey
影响因子：
3.8
作者：
French, GC;Ennos, RA;Hollingsworth, PM
通讯作者：
Hollingsworth, PM
影响因子：
30.8
作者：
Chia, Jer-Ming;Song, Chi;Ware, Doreen
通讯作者：
Ware, Doreen