• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of plant sciences >POLLEN EVOLUTION IN THE EARLY-DIVERGENT MONOCOT ORDER ALISMATALES
【24h】

POLLEN EVOLUTION IN THE EARLY-DIVERGENT MONOCOT ORDER ALISMATALES

机译：早散单阶有价证券中的花粉进化

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Alismatales are a key clade in monocot evolution, as they are sister to all other monocots, excluding Acorales. However, phylogenetic relationships within the order are poorly resolved, prompting the need for a reevaluation of pollen and tapetum characters, which have proved useful in other monocot groups, such as lilioids. Development of monosulcate pollen in Aponogeton (Aponogetonaceae) and Butomus (Butomaceae) and of pantoporate pollen in Echinodorus (Alismataceae) is examined here. Phylogenetic mapping of pollen and tapetum characters, based on both original observations and an extensive literature search, demonstrates that Alismatales are characterized by a potential synapomorphy: a plasmodial tapetum. Microsporogenesis is successive, a character shared with Acorus and probably other potential outgroups. Linked character syndromes, involving thin-walled or exineless, inaperturate (omniaperturate) pollen with a smooth or reticulate surface, have evolved iteratively within the order, probably related to the aquatic or semiaquatic habit of many alismatids. Extremely long (up to 1500 μm) filamentous pollen, associated with hydrophilous pollination, occurs in three closely related families (Cymodoceaceae, Posidoniaceae, and Zosteraceae). Pantoporate spiny pollen is a potential synapomorphy for Alismataceae (including Limnocharitaceae). Alismatales share some characters (plasmodial tapetum and reniform pollen) with Pandanales, although further work is required to investigate whether this apparent homoplasy is of systematic significance. Tofieldiaceae possess two interesting apomorphies (simultaneous microsporogenesis and a secretory tapetum) that are also found in Petrosaviales and some Dioscoreales.
机译：Alismatales是单子叶植物进化的关键进化枝，因为它们是除Acorales以外的所有其他单子叶植物的姐妹。但是，该顺序内的系统发育关系很难解决，因此需要重新评估花粉和绒毡层的性状，事实证明这些花粉和绒毡层性状在其他单子叶植物类（如百合类）中很有用。此处研究了蓬头藻（Aponogetonaceae）和Butomus（Butomaceae）中单硫酸盐花粉的发育以及棘皮odor科（Alismataceae）中泛钙花粉的发育。基于原始观察和广泛文献检索的花粉和绒毡层性状的系统发生图谱表明，Alismatales具有潜在的突触形态：浆状绒毡层。小孢子发生是连续的，与Acorus和其他可能的潜在群体共有。涉及性状的综合症，包括薄壁或外生的，无孔的（全无孔）花粉，表面光滑或网状，已在该顺序内反复演变，可能与许多水生动物的水生或半水生习性有关。与亲水性授粉有关的极长的丝状花粉（最多1500μm）出现在三个密切相关的科中（ym科，Po科和带菌科）。 Pantoporate刺花粉是泽泻科（包括小木犀科）的潜在亚同形。拟南芥与露兜树共有一些特征（质膜绒毡层和肾形花粉），尽管还需要进一步的研究来研究这种明显的同质性是否具有系统意义。虎耳草科具有两个有趣的无性型（同时发生了小孢子发生和分泌性绒毡层），在Petrosaviales和一些Dioscoreales中也有发现。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号