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Skipping the Dry Diagonal: spatio-temporal evolution of Croton section Cleodora (Euphorbiaceae) in the Neotropics
Botanical Journal of the Linnean Society ( IF 2.3 ) Pub Date : 2021-01-23 , DOI: 10.1093/botlinnean/boab016
Irene Masa-Iranzo 1 , Isabel Sanmartín 1 , Maria Beatriz R Caruzo 2 , Ricarda Riina 1
Affiliation  

Croton is one of the largest angiosperm genera, with > 1200 species in the tropics worldwide. The arborescent Croton section Cleodora stands out for its disjunct geographical distribution with two main centres of diversity in the Amazonian and Atlantic Forest regions, separated by the Caatinga, Cerrado and Chaco biomes (the ‘Dry Diagonal’). This disjunction is found in other Neotropical lineages and attributed to Neogene geological and climatic events. We inferred a nearly complete phylogenetic reconstruction of Croton section Cleodora based on DNA sequences of nuclear ITS and five plastid regions (rps16, trnH-psbA, trnL-F, trnT-L and ycf1). We further estimated divergence times and reconstructed ancestral ranges using Bayesian methods. Our results show that Croton section Cleodora is monophyletic with two main clades; we also confirm the phylogenetic adscription of eight Croton spp. recently described or assigned to section Cleodora based on morphology. Divergence of section Cleodora from its sister clade occurred c. 25 Mya, and diversification within this group started 20 Mya. Biogeographic analyses suggest the section originated in the Amazonian region, from where it dispersed to other forested Neotropical regions, including the Atlantic Forest. Divergence between Amazonian and Atlantic Forest taxa appears to have been triggered by the formation of the South American Dry Diagonal.

中文翻译:

跳过干对角线:新热带巴豆科克莱奥多拉(大戟科)的时空演化

巴豆是最大的被子植物属之一,具有 > 全世界热带地区有1200种。乔木巴豆部分 Cleodora 因其不连贯的地理分布而脱颖而出,在亚马逊和大西洋森林地区有两个主要的多样性中心,由卡廷加、塞拉多和查科生物群落(“干对角线”)隔开。这种分离在其他新热带谱系中发现并归因于新近纪的地质和气候事件。我们基于核 ITS 和五个质体区域(rps16、trnH-psbA、trnL-F、trnT-L 和 ycf1)的 DNA 序列推断出巴豆切片 Cleodora 的近乎完整的系统发育重建。我们进一步估计了分歧时间并使用贝叶斯方法重建了祖先范围。我们的研究结果表明,巴豆部分 Cleodora 是单系的,具有两个主要的进化枝;我们还证实了八种巴豆属的系统发育描述。最近根据形态学描述或分配到 Cleodora 部分。Cleodora部分与其姐妹进化枝的分歧发生在c。25 Mya,该组内的多样化开始于 20 Mya。生物地理学分析表明,该部分起源于亚马逊地区,从那里分散到其他森林覆盖的新热带地区,包括大西洋森林。亚马逊和大西洋森林分类群之间的分歧似乎是由南美干对角线的形成引发的。生物地理学分析表明,该部分起源于亚马逊地区,从那里分散到其他森林覆盖的新热带地区,包括大西洋森林。亚马逊和大西洋森林分类群之间的分歧似乎是由南美干对角线的形成引发的。生物地理学分析表明,该部分起源于亚马逊地区,从那里分散到其他森林覆盖的新热带地区,包括大西洋森林。亚马逊和大西洋森林分类群之间的分歧似乎是由南美干对角线的形成引发的。
更新日期:2021-01-23
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