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首页> 外文期刊>International journal of plant sciences >EXTENDING THE RANGE OF DERIVED LATE PALEOZOIC CONIFERS: LEBOWSKIA GEN. NOV. (MAJONICACEAE)
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EXTENDING THE RANGE OF DERIVED LATE PALEOZOIC CONIFERS: LEBOWSKIA GEN. NOV. (MAJONICACEAE)

机译：扩大了晚古生代的范围：Lebowskia gen。十一月（MA科）

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摘要

Phylogenetic analysis suggests that the conifer families Majonicaceae and Ullmanniaceae (voltzian Voltziales), known from the equatorial Late Permian Euro-American flora province, arose from a member of a paraphyletic group of walchian Voltziales commonly referred to as walchian conifers. The Majonicaceae and Ullmanniaceae are more derived in that they have fused female reproduction organs and a more advanced reproduction strategy that involves a pollen tube. Until recently, it has not been possible to establish with accuracy when these conifers originated or when they started their rise to dominance over the walchian conifers. Findings from late Early to early Middle Permian localities in north-central Texas prove that radiation in these conifer lineages occurred significantly earlier than previously thought. The natural genus Lebowskia (Majonicaceae) from the Early Lower Pease River flora is described and compared with Late Permian taxa. It confirms that the Majonicaceae were already well differentiated during Early Permian times and considerably extends their geographic and temporal range. It shows that structural evolution and diversification among these conifer taxa took place before late Early Permian. Evolution and migration of conifers in the Late Paleozoic tropical regions seems to have been strongly influenced by the increasingly drier climate.
机译：系统发育分析表明，从赤道晚期的二叠纪欧美植物区系中得知的针叶树科Majonicaceae和Ullmanniaceae（伏尔兹伏尔茨科），起源于通常被称为沃尔奇针叶树的沃尔奇伏尔茨科的一个共生物种的成员。 Majonicaceae和Ullmanniaceae的起源更多，因为它们融合了雌性生殖器官，并且采用了更高级的繁殖策略，其中涉及花粉管。直到最近，还无法准确地确定这些针叶树何时起源或何时开始在沃尔奇针叶树上占主导地位。在得克萨斯州中北部从早二叠世晚期到中二叠世早期的发现证明，这些针叶树世系中的辐射发生的时间比以前认为的要早得多。描述了下豌豆河早期植物区系的天然Lebowskia（Majonicaceae），并将其与二叠纪晚期的分类群进行了比较。它证实了Majonicaceae在二叠纪早期就已经很好地区分了，并大大扩展了它们的地理和时间范围。它表明这些针叶树类群之间的结构演化和多样化发生在早二叠世晚期之前。在古生代晚期热带地区，针叶树的进化和迁移似乎受到越来越干燥的气候的强烈影响。

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