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排序方式: 共有376条查询结果,搜索用时 890 毫秒
61.
David Castonguay Julien Dufort-Gervais Caroline Ménard Manavi Chatterjee Rémi Quirion Bruno Bontempi Jay S. Schneider Amy F.T. Arnsten Angus C. Nairn Christopher M. Norris Guylaine Ferland Erwan Bézard Pierrette Gaudreau Paul J. Lombroso Jonathan Brouillette 《Current biology : CB》2018,28(7):1079-1089.e4
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Bruno Pernet 《Evolution; international journal of organic evolution》1999,53(2):435-446
The evolution of gamete incompatibility between free-spawning marine invertebrate species has been explained by three hypotheses: (1) independent divergence at gamete recognition loci; (2) selection against hybrids; and (3) a process of sexual selection involving polymorphic gamete recognition loci (Metz and Palumbi 1996). The first two hypotheses predict that gamete incompatibility appears only after gene flow has been halted for other reasons and the third that gamete incompatibility appears simultanously with blocks to gene flow. Here I show that gametes of three sympatric polychaetes in the genus Arctonoe are compatible in all crosses, over a broad range of gamete concentrations and contact times. Although at least some hybrid crosses produce fertile adults, allozyme and mitochondrial DNA sequence data indicate that the three species do not regularly exchange genes. These data are consistent with predictions of the first two hypotheses for the evolution of gamete incompatibility, but allow rejection of the third hypothesis. Gametes of the three species are compatible despite estimated divergence times of 1–3 M.Y.B.P.; in several other marine invertebrates, divergence times of the same magnitude are associated with asymmetric or complete gamete incompatibility. It appears likely that segregation of symbiotic adults on their respective host species restricts mating opportunities, and thus gene flow, among Arctonoe species. 相似文献
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WOX14 promotes bioactive gibberellin synthesis and vascular cell differentiation in Arabidopsis 下载免费PDF全文
Erwan Denis Nadia Kbiri Viviane Mary Gaëlle Claisse Natalia Conde e Silva Martin Kreis Yves Deveaux 《The Plant journal : for cell and molecular biology》2017,90(3):560-572
Procambial and cambial stem cells provide the initial cells that allow the formation of vascular tissues. WOX4 and WOX14 have been shown to act redundantly to promote procambial cell proliferation and differentiation. Gibberellins (GAs), which have an important role in wood formation, also stimulate cambial cell division. Here we show that the loss of WOX14 function phenocopies some traits of GA‐deficient mutants that can be complemented by exogenous GA application, whereas WOX14 overexpression stimulates the expression of GA3ox anabolism genes and represses GA2ox catabolism genes, promoting the accumulation of bioactive GA. More importantly, our data clearly indicate that WOX14 but not WOX4 promotes vascular cell differentiation and lignification in inflorescence stems of Arabidopsis. 相似文献
67.
Qiuchi Wan Zhuo Zheng Kangyou Huang Erwan Guichoux Rémy J. Petit 《Tree Genetics & Genomes》2017,13(4):73
Subtropical East Asia harbours a large plant diversity that is often attributed to allopatric speciation in this topographically complex region characterized by a relative climate stability. Here, we use observations of Platycarya, a widespread subtropical Asian tree genus, to explore the consequences of past climate stability on species’ evolutionary history in subtropical China. This genus has a controversial taxonomy: while it is now prevailingly treated as monotypic, two species have been originally described, Platycarya strobilacea and P. longipes. Previous information from species distribution models, fossil pollen data and genetic data based on chloroplast DNA (cpDNA) were integrated with newly obtained genetic data from the two putative species. We used both cpDNA (psbA-trnH and trnL-F intergenic spacers, including a partial trnL gene sequence) and nuclear markers. The latter included sequences of the internal transcribed spacer region (ITS1–5.8S–ITS2) of the nuclear ribosomal DNA and random genomic single nucleotide polymorphisms. Using these nuclear genetic markers, we found interspecific genetic divergence fitting with the ‘two species’ scenario and geographically structured intraspecific variation. Using cpDNA markers, we also found geographically structured intraspecific variation. Despite deep inter- and intraspecific genetic divergence, we detected genetic admixture in southwest China. Overall, our findings of genetic divergence within Platycarya support the hypothesis of allopatric speciation. However, episodes of population interconnection were identified, at least in southwest China, suggesting that the genus has had a dynamic population history. 相似文献
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Erwan G. Roussel Anne-Laure Sauvadet Carine Chaduteau Yves Fouquet Jean-Luc Charlou Daniel Prieur Marie-Anne Cambon Bonavita 《Environmental microbiology》2009,11(9):2446-2462
The distribution of the archaeal communities in deep subseafloor sediments [0–36 m below the seafloor (mbsf)] from the New Caledonia and Fairway Basins was investigated using DNA- and RNA-derived 16S rRNA clone libraries, functional genes and denaturing gradient gel electrophoresis (DGGE). A new method, Co-Migration DGGE (CM-DGGE), was developed to access selectively the active archaeal diversity. Prokaryotic cell abundances at the open-ocean sites were on average ∼3.5 times lower than at a site under terrestrial influence. The sediment surface archaeal community (0–1.5 mbsf) was characterized by active Marine Group 1 (MG-1) Archaea that co-occurred with ammonia monooxygenase gene ( amoA ) sequences affiliated to a group of uncultured sedimentary Crenarchaeota . However, the anoxic subsurface methane-poor sediments (below 1.5 mbsf) were dominated by less active archaeal communities, such as the Thermoplasmatales , Marine Benthic Group D and other lineages probably involved in the methane cycle ( Methanosarcinales , ANME-2 and DSAG/MBG-B). Moreover, the archaeal diversity of some sediment layers was restricted to only one lineage (Uncultured Euryarchaeota , DHVE6, MBG-B, MG-1 and SAGMEG). Sequences forming two clusters within the Thermococcales order were also present in these cold subseafloor sediments, suggesting that these uncultured putative thermophilic archaeal communities might have originated from a different environment. This study shows a transition between surface and subsurface sediment archaeal communities. 相似文献
69.
Melanie Lechner Karin Schmitt Susanne Bauer David Hot Christine Hubans Erwan Levillain Camille Locht Yves Lemoine Roy Gross 《BMC microbiology》2009,9(1):141
Background
Among the members of the genus Bordetella B. petrii is unique, since it is the only species isolated from the environment, while the pathogenic Bordetellae are obligately associated with host organisms. Another feature distinguishing B. petrii from the other sequenced Bordetellae is the presence of a large number of mobile genetic elements including several large genomic regions with typical characteristics of genomic islands collectively known as integrative and conjugative elements (ICEs). These elements mainly encode accessory metabolic factors enabling this bacterium to grow on a large repertoire of aromatic compounds. 相似文献70.
Erwan Plouguerné Efstathia Ioannou Panagiota Georgantea Constantinos Vagias Vassilios Roussis Claire Hellio Edouard Kraffe Valérie Stiger-Pouvreau 《Marine biotechnology (New York, N.Y.)》2010,12(1):52-61
The purification of the chloroform extract from the brown invasive macroalga Sargassum muticum, through a series of chromatographic separations, yielded 12 fractions that were tested against strains of bacteria, microalgae,
and fungi involved in marine biofilm formation. The chemical composition of four (a, c, g, and k) out of the six fractions
that exhibited anti-microfouling activity was investigated. Fraction a contained saturated and unsaturated linear hydrocarbons
(C12–C27). Arachidonic acid was identified as the major metabolite in fraction c whereas fraction g contained mainly palmitic, linolenic,
and palmitoleic acids. Fraction k was submitted to further purification yielding the fraction kAcaF1e that was composed of
galactoglycerolipids, active against the growth of two of the four bacterial strains (Shewanella putrefaciens and Polaribacter irgensii) and all tested fungi. These promising results, in particular the isolation and the activity of galactoglycerolipids, attest
the potential of the huge biomass of S. muticum as a source of new environmentally friendly antifouling compounds. 相似文献