Divergence times and morphological evolution of the subtribe Eritrichiinae (Boraginaceae-Rochelieae) with special reference to Lappula

Mahboubeh Sherafati, Maryam Khoshsokhan-Mozaffar, S. Kazempour-Osaloo
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Abstract

The subtribe Eritrichiinae belongs to tribe Rochelieae (Borginaceae; Cynoglossoideae) which is composed of about 200 species in five genera including Eritrichium, Lappula, Hackelia, Lepechiniella, and Rochelia. The majority of the species are annual and grow in xeric habitats. The genus Lappula as an arid adapted and the second biggest genus of Eritrichiinae with over 50 species is distributed predominantly in Irano-Turanian region. Here, we employed BEAST Bayesian inference for divergence time estimation based on nrDNA ITS, plastid trnL-F and rpl32-trnL (UAG) sequence data of 46 species of Eritrichiinae extracted from GenBank. The results obtained from molecular dating analyses indicated that the date of Eritrichiinae crown group back to late Oligocene. Diversification events took place for Lappula in Asia from the late Miocene to the late Pleistocene. The North American species have been derived from the Asian relatives at the late Miocene.
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凤尾草科凤尾草亚族的分化时间与形态演化,并以凤尾草为例
凤梨亚族属于凤梨科凤梨亚族;该属包括厄立特里亚属、拉普拉属、哈克利属、Lepechiniella和罗chelia等5属约200种。大多数物种是一年生的,生长在干旱的栖息地。拉普拉属(Lappula)是厄立特里亚科第二大属,有50多种,主要分布在伊朗-图兰地区。本文基于从GenBank中提取的46种厄立特里亚亚种的nrDNA ITS、质体trnL-F和rpl32-trnL (UAG)序列数据,采用BEAST贝叶斯推理进行发散时间估计。分子定年分析结果表明,厄立特里亚科冠群的年代可追溯到晚渐新世。在晚中新世至晚更新世期间,亚洲拉普拉发生了多样化事件。北美种是在中新世晚期由亚洲近亲演化而来的。
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