Plastid Genome Evolution in the Subtribe Calypsoinae (Epidendroideae, Orchiaaceae)
Plastid Genome Evolution in the Subtribe Calypsoinae (Epidendroideae, Orchiaaceae)
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Calypsoinae 亚族（Epidendroideae、 Orchiaaceae）的质体基因组进化
DOI：
10.1093/gbe/evaa091
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发表时间：
2020-06-01
影响因子：
3.3
通讯作者：
Jin, Xiao-Hua
中科院分区：
文献类型：
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作者：
Li, Zhang-Hai;Jiang, Yan;Jin, Xiao-Hua
红兰亚科（Calypsoinae）是兰科（Epidendroideae）的一个小亚族，具有丰富的营养策略和形态特征。Calypsoinae包括13个属，其中4个是无叶和真菌异养的。珊瑚根属无叶种中的菌异养种非常适合于质体组进化的研究。然而，缺乏质体序列的其他属在Calypsoinae限制了比较和系统发育分析的范围，特别是我们的理解质体进化。为了了解质体基因组的进化在Calypsoinae，我们新测序的12个物种的质体亚族，包括3个真菌异养属的代表，以及5个自养属。我们检测到两个平行的光合损失珊瑚根。进化分析表明，过渡到专性真菌异养导致放松选择在一个高度基因特异性的模式。
Calypsoinae is a small subtribe in Orchidaceae (Epidendroideae) characterized by diverse trophic strategies and morphological characters. Calypsoinae includes 13 genera, four of which are leafless and mycoheterotrophic. Mycoheterotrophic species in the leafless genus Corallorhiza are well suited to studies of plastome evolution. However, the lack of plastome sequences for other genera in Calypsoinae limits the scope of comparative and phylogenetic analyses, in particular our understanding of plastome evolution. To understand plastid genome evolution in Calypsoinae, we newly sequenced the plastomes of 12 species in the subtribe, including representatives of three mycoheterotrophic genera as well as five autotrophic genera. We detected two parallel photosynthetic losses in Corallorhiza. Evolutionary analyses indicated that the transition to obligate mycoheterotrophy leads to the relaxation of selection in a highly gene-specific pattern.