棘球菊属(菊科)花粉的进化:解读巨大花粉粒的起源

IF 1.5 3区 生物学 Q3 PLANT SCIENCES
O. Hidalgo, Ismael Sánchez-jiménez, L. Palazzesi, B. Loeuille, T. Garnatje
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引用次数: 1

摘要

研究的前提。棘球菊属在菊科的Cardueae部落中是独一无二的,因为它具有两个独特的特征,这两个特征都与生殖结构有关:合头花序(=次生头状花序)和一个令人印象深刻的大花粉粒,其三角形截面可能是所有植物细胞壁中最厚的。虽然合头虫属构成了合头虫属,但最近的证据表明,一些棘足虫种的花粉与其他棘足虫科的花粉相似。因此,本研究旨在深入了解属内花粉进化的时空框架。方法。利用光镜和扫描电镜对28种棘龙35份标本进行了显微形态学分析。对两种棘球虫和Cardopatium corymbosum进行了花粉计数。花粉资料是在一个古老的棘足动物系统发育的背景下讨论的。为了比较,我们整理了622个Cardueae物种和303个Vernonieae分类群的花粉资料。Vernonieae是另一个进化出syncephaly的部落。关键的结果。“多年生”Echinops花粉型具有巨大的尺寸和三角形截面,可能来源于“一年生”Echinops花粉型,在形状、大小和外壁结构上与其他Cardueae更相似。花粉类型的转变发生在合头畸形进化后很长一段时间。花粉大小的增加并不以花粉数量的减少为代价,这可能是对温暖的环境条件和雄性竞争加剧的反应。结论。这一研究证明了在该属中对新表型空间的进化探索,最肯定的是对物种多样化的气候背景的响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pollen Evolution in the Genus Echinops (Cardueae, Asteraceae): Deciphering the Origin of Giant Pollen Grains
Premise of research. The genus Echinops is unique among the Cardueae tribe of Asteraceae for presenting two distinctive features, both related to reproductive structures: a syncephalium (=secondary capitulum) and an impressively large pollen grain with a triangular section and probably the thickest of all plant cell walls. While the syncephalium constitutes a synapomorphy for the genus, recent evidence suggests that some Echinops species have pollen similar to that of other Cardueae. This study therefore seeks to contribute insights into the spatiotemporal frame of pollen evolution within the genus. Methodology. Micromorphological characterization was provided for 35 specimens from 28 Echinops species using light and scanning electron microscopy. Pollen counts were carried out for two Echinops species and Cardopatium corymbosum. Pollen data are discussed in the context of a dated Echinops phylogeny. For comparison purposes, new and published pollen data of 622 Cardueae species and 303 taxa of Vernonieae, another tribe where syncephaly has evolved, were collated. Pivotal results. The “Perennial” Echinops pollen type of huge size and triangular section likely derived from the “Annual” Echinops pollen type, more similar in shape, size, and exine structure to that of other Cardueae. Pollen type transition took place in the genus long after syncephaly evolved. Pollen size increase did not occur at the expense of pollen quantity and could respond to warmer environmental conditions and increased male competition. Conclusions. This study of Echinops pollen evidenced the evolutionary exploration of novel phenotypic space in the genus, most certainly in response to the climatic context in which the species have diversified.
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来源期刊
CiteScore
4.50
自引率
4.30%
发文量
65
审稿时长
6-12 weeks
期刊介绍: The International Journal of Plant Sciences has a distinguished history of publishing research in the plant sciences since 1875. IJPS presents high quality, original, peer-reviewed research from laboratories around the world in all areas of the plant sciences. Topics covered range from genetics and genomics, developmental and cell biology, biochemistry and physiology, to morphology and anatomy, systematics, evolution, paleobotany, plant-microbe interactions, and ecology. IJPS does NOT publish papers on agriculture or crop improvement. In addition to full-length research papers, IJPS publishes review articles, including the open access Coulter Reviews, rapid communications, and perspectives. IJPS welcomes contributions that present evaluations and new perspectives on areas of current interest in plant biology. IJPS publishes nine issues per year and regularly features special issues on topics of particular interest, including new and exciting research originally presented at major botanical conferences.
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