Evolutionary patterns of plastome uncover diploid-polyploid maternal relationships in Triticeae
Evolutionary patterns of plastome uncover diploid-polyploid maternal relationships in Triticeae
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质体的进化模式揭示了小麦科二倍体-多倍体母本关系
DOI：
10.1016/j.ympev.2020.106838
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发表时间：
2020-08-01
影响因子：
4.1
通讯作者：
Fan，Xing
中科院分区：
文献类型：
--
作者：
Chen，Ning;Chen，Wen-Jie;Fan，Xing
为了研究小麦族二倍体与多倍体的关系以及母系祖先在多倍体丰富度建立中的作用，对该部落中几乎所有基因组构成的35个多倍体和代表20个基本基因组的48个二倍体分类群进行了分析。系统基因组重建、遗传距离矩阵和质体组序列的核苷酸多样性模式表明：(1)具有u -和d -基因组的一年生多倍体物种的母系供体与远缘物种有亲缘关系。umbellulataandAe。分别tauschii。具有这些、G和b基因组的一年生多倍体物种的母系供体来自于aegilops属的sitopsissection种。含x多倍体的一年生种由母本eremopyruma供体；(2)假种和假种分别是多年生植物含有est和ns多年生多倍体的母本供体；(3) hophopyrum、thinopyrumand asypyrum基因组通过不完整的谱系分选和/或叶绿体捕获将细胞质基因组贡献给了含st多倍体物种，这些谱系通过多倍体遗传传递给了含st多倍体物种；(4)含st多倍体种间存在网状关系。遗传异质性可能与小麦科多倍体的丰富度有关。
To investigate the diploid-polyploid relationships and the role of maternal progenitors in establishment of polyploid richness in Triticeae, 35 polyploids representing almost all genomic constitutions together with 48 diploid taxa representing 20 basic genomes in the tribe were analyzed. Phylogenomic reconstruction, genetic distance matrix, and nucleotide diversity patterns of plastome sequences indicated that (1) The maternal donor of the annual polyploid species with theU- andD-genome are related to extantAe. umbellulataandAe. tauschii, respectively. The maternal donor to the annual polyploid species with theS-,G-, andB-genome originated from the species ofSitopsissection of the genusAegilops. The annual species with theXe-containing polyploids were donated byEremopyrumas the female parent; (2)PseudoroegneriaandPsathyrostachyswere the maternal donor of perennial species with theSt- andNs-containing polyploids, respectively; (3) TheLophopyrum,ThinopyrumandDasypyrumgenomes contributed cytoplasm genome toPseudoroegneriaspecies as a result of incomplete lineage sorting and/or chloroplast captures, and these lineages were genetically transmitted to theSt-containing polyploid species via polyploidization; (4) There is a reticulate relationship among theSt-containing polyploid species. It can be suggested that genetic heterogeneity might associate with the richness of the polyploids in Triticeae.