Speciation by triparental hybridization in genusSorbus(Rosaceae)
Speciation by triparental hybridization in genusSorbus(Rosaceae)
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DOI：
10.1007/s42977-020-00003-x
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发表时间：
2020-07-15
期刊：
影响因子：
2.1
通讯作者：
Hoehn, Maria
中科院分区：
文献类型：
--
作者：
Nemeth, Csaba;Papp, Nora;Hoehn, Maria
与多倍体化和无融合生殖有关的杂交是一种常见的物种形成机制，花楸属是一个不断杂交的属，它产生一个具有不同亲本谱系的多倍体复合体。intermediaandS. x liljeforsiii组合联合收割机的基因组的三个类群（S. Ariaagg.，S. aucupariaandS. torminalis）。阐明S. dacica，S. paxianaandS. tauricola，三个新的三基因组候选人以前被认为是双亲起源与eitherS。阿里亚x S.桃叶珊瑚S.阿里亚x S.我们结合了HPLC和叶绿体DNA的数据，分析了另外33个相关的分类群。我们的结论是，'torminalis型'类黄酮配置文件和'桃金娘型'质体表明的参与bothS。龙卷风S.结果表明，S. dacica，S. paxianaandS. tauricola.花楸Sorbus ariaagg.作为第三个祖先，并作为一个必要的环节，以满足基因的S。龙卷风S.一个基因组中的aucupariain从形态特征（叶下侧密被绒毛）上是明显的。四倍体细胞型和专性假配子体。达西卡和S. paxiana的测定，并首次发表在这里。三亲种最可能的进化情景是：1.一个二倍体的有性细胞aucupariaas花粉受体与来自S.阿里亚产生一个三倍体无融合生殖分类群，其质体为“桃叶珊瑚型”，母系遗传; 2.在第二次杂交事件中，该Soraria亚属杂种作为母本与有性二倍体杂交。torminalis（提供芹菜素O-葡萄糖醛酸苷合成的基因）与'桃叶珊瑚型'质体和'torminalis-type'黄酮类化合物形成四倍体三亲本杂种。
Hybridization associated with polyploidization and apomixis is a frequent mechanism of speciation.Sorbusis a genus with ongoing hybridization resulting in a polyploid complex with different parental lineage.Triparensis the smallest hybridogenous subgenus ofSorbusso far known to comprise only two taxa,S. intermediaandS. x liljeforsiithat combine the genomes of three taxa (S. ariaagg.,S. aucupariaandS. torminalis). To elucidate the origins ofS. dacica,S. paxianaandS. tauricola, three new trigenomic candidates formerly believed to be of biparental origin with eitherS. ariaagg. x S. aucupariaorS. ariaagg. x S. torminalislineage we combined data from HPLC and chloroplast DNA analysing additional 33 related taxa as well. We concluded that the 'torminalis-type' flavonoid profile and the 'aucuparia-type' plastid indicate the participation of bothS. torminalisandS. aucupariaresulting in the formation ofS. dacica,S. paxianaandS. tauricola.Sorbus ariaagg. as the third ancestor and as a necessary link to meet genes ofS. torminalisandS. aucupariain one genome is obvious from morphological features (densely tomentose undersides of leaves). The tetraploid cytotypes and obligate pseudogamy ofS. dacicaandS. paxianawere determined by flow cytometry and are published here for the first time. The most probable evolutionary scenario forTriparensspecies is: 1. a diploid sexualS. aucupariaas pollen acceptor hybridized with a tetraploid apomictic taxon from theS. ariaagg. producing a triploid apomictic taxon with 'aucuparia-type' plastid inherited maternally; 2. during a second crossing event this subgenusSorariahybrid as maternal progenitor hybridized with the sexual diploidS. torminalis(providing gene(s) of apigenin O-glucuronide synthesis) forming a tetraploidTriparenshybrid with 'aucuparia-type' plastid and 'torminalis-type' flavonoids.