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首页> 外文期刊>Systematic Botany >Testing a Hypothesis of Intergeneric Allopolyploidy in Vine Cacti (Cactaceae: Hylocereeae)
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Testing a Hypothesis of Intergeneric Allopolyploidy in Vine Cacti (Cactaceae: Hylocereeae)

机译：测试藤类仙人掌（仙人掌科：Hylocereeae）中的同种异源多倍体假说

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Allopolyploidy is common in angiosperms, but only rarely involves different genera. One hypothesized case of intergeneric allopolyploidy is Hylocereus megalanthus, a member of Cactaceae tribe Hylocereeae, a group of vine cactus species, some of which are known for their edible fruits ("pitahaya" or "dragon fruit"). This polyploid species has been interpreted as morphologically intermediate between Hylocereus and Selenicereus. Plastid and nuclear ribosomal DNA ITS sequences from all H. megalanthus individuals sampled are either identical (plastid), or form a monophyletic clade despite considerable intraindividual polymorphism (ITS). Plastid and ITS phylogenies both show H. megalanthus nested within a well-supported Hylocereus, which in turn is nested within a paraphyletic Selenicereus. The absence of more than one lineage of ITS in H. megalanthus is consistent with autopolyploidy, but could be due to inter-homoeologue concerted evolution. Numerous low-copy nuclear genes were tested for utility in these vine cacti, and two (phyC and Vatp1) were sampled from H. megalanthus and a subset of Hylocereus and Selenicereus species. In both cases, H. megalanthus haplotypes were more closely related to each other than to other Hylocereus or Selenicereus haplotypes. Thus, we found no evidence for allopolyploidy, let alone intergeneric allopolyploidy, in H. megalanthus.
机译：异倍体在被子植物中很常见，但很少涉及不同的属。一个假定的属间同种多倍体的案例是巨人Hylocereus megalanthus，它是一组仙人掌类葡萄的仙人掌属Hylocereeae的成员，其中一些以其可食用的果实（“ pitahaya”或“ dragon fruit”）而闻名。这种多倍体物种已被解释为在Hylocereus和Selenicereus之间的形态学中间。尽管有相当大的个体内多态性（ITS），但来自所有采样的H. megalanthus个体的质体和核糖体DNA ITS序列还是相同的（质体），还是形成了单系进化枝。 Plastid和ITS系统发育都显示巨大的H. lanlanus嵌套在支撑良好的Hylocereus内，而Hylocereus则嵌套在副生的Selenicereus内。巨人嗜血杆菌中不存在一个以上的ITS谱系与同倍体性相符，但可能是由于同源同源的协同进化所致。测试了许多低拷贝核基因在这些藤本仙人掌中的效用，并从巨型H.megalanthus以及Hylocereus和Selenicereus物种的子集中采样了两个（phyC和Vatp1）。在这两种情况下，H。megalanthus单倍型与其他Hylocereus或Selenicereus单倍型之间的关系更为密切。因此，我们没有发现在巨人嗜血杆菌中存在同种多倍体的证据，更不用说属间同种多倍体了。

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