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- 저자 : Erik Smets (검색결과 2 건)
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MOON, HYE-KYOUNG,HONG, SUK-PYO,SMETS, ERIK,HUYSMANS, SUZY Blackwell Publishing Ltd 2009 Botanical journal of the Linnean Society Vol.160 No.2
<P>A comparative micromorphological study of leaves was carried out on 102 species of Mentheae; 61 species were selected for the anatomical study. Mentheae possessed both amphistomatic and hypostomatic leaves. The diversity of leaf epidermal characteristics was based on the variation in morphology of epidermal cells, stomata types and trichome types. Although each characteristic on its own has rather limited systematic value, the combination of some of these features may be systematically relevant, especially for the identification of species. For example, branched multicellular nonglandular trichomes were a diagnostic characteristic for all genera investigated of the subtribe Salviinae; however, this trichome type was also observed in <I>Hedeoma ciliolata</I> and <I>Neoeplingia leucophylloides</I> of the subtribe Menthinae. Capitate glandular trichomes with pear-shaped heads were only observed in <I>Salvia dorrii</I>. Subsessile glandular trichomes with multicellular heads (more than ten cells) were an apomorphy for <I>Perovskia</I>. The anatomical leaf structure was consistent throughout the tribe. In some species, the vascular bundles in the midrib were modified into a mechanical tissue, which is an adaptation to xerophytic environments. The observed variations are discussed in an ecological context and their phylogenetic significance is evaluated. © 2009 The Linnean Society of London, <I>Botanical Journal of the Linnean Society</I>, 2009, <B>160</B>, 211–231.</P>
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Identification, Origin, and Evolution of Leaf Nodulating Symbionts of Sericanthe (Rubiaceae)
Benny Lemaire,Elmar Robbrecht,Braam van Wyk,Sandra Van Oevelen,Brecht Verstraete,Els Prinsen,Erik Smets,Steven Dessein 한국미생물학회 2011 The journal of microbiology Vol.49 No.6
Bacterial leaf symbiosis is an intimate association between bacteria and plants in which endosymbionts are housed within leaf nodules. This phenomenon has been reported in three genera of Rubiaceae (Pavetta, Psychotria, and Sericanthe), but the bacterial partner has only been identified in Psychotria and Pavetta. Here we report the identification of symbiotic bacteria in two leaf nodulating Sericanthe species. Using 16S rRNA data and common housekeeping genetic markers (recA and gyrB) we studied the phylogenetic relationships of bacterial endosymbionts in Rubiaceae. Endosymbionts of leaf nodulating Rubiaceae were found to be closely related and were placed as a monophyletic group within the genus Burkholderia (β-Proteobacteria). The phylogenetic analyses revealed a pattern of strict host specificity and placed the two investigated endosymbionts at two distinct positions in the topology of the tree, suggesting at least two different evolutionary origins. The degree of sequence divergence between the Sericanthe endosymbionts and their relatives was large enough to propose the Sericanthe endosymbionts as new species (‘Candidatus Burkholderia andongensis’ and ‘Candidatus Burkholderia petitii’). In a second part of this study, the pylogenetic relationships among nodulating and non-nodulating Sericanthe species were investigated using sequence data from six chloroplast regions (rps16, trnG, trnL-trnF, petD, petA-psbJ, and atpI-atpH). Overall, genetic variation among the plastid markers was insufficient to enable phylogenetic estimation. However, our results could not rule out the possibility that bacterial leaf symbiosis originated once in a common ancestor of the Sericanthe species.
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