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首页> 外文期刊>Estuarine Coastal and Shelf Science >Prokaryotes in salt marsh sediments of Ria de Aveiro: Effects of halophyte vegetation on abundance and diversity
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Prokaryotes in salt marsh sediments of Ria de Aveiro: Effects of halophyte vegetation on abundance and diversity

机译：Ria de Aveiro盐沼沉积物中的原核生物：盐生植物植被对丰度和多样性的影响

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摘要

The aim of this study was to investigate the influence of monospecific colonization of sediment stands by Spartina maritima or Halimione portulacoides on benthic prokaryote assemblages in a salt marsh located in Ria de Aveiro (Portugal). The distribution of Bacteria, Archaea and sulfate-reducing bacteria (SRB) in sediments with monospecific plant stands and in unvegetated sediments was characterized by Fluorescence In Situ Hybridization (FISH). Total prokaryote abundance (0.4 × 10~9-1.7 × 10~9 cells gdw~(-1)) was highest in sediments from the surface layer. The domain Bacteria comprised approximately 40% of total prokaryote communities with the highest percentages occurring in the surface layer. Archaeal cells corresponded to an average of 25% of total prokaryote population, with higher abundance in the vegetation banks, and displaying homogeneous vertical distribution. The relative abundance of SRB represented approximately 3% of total 4', 6-diamidino-2-phenylindole dihydrochloride (DAPI) stained cells at unvegetated sediment and H. portulacoides stand and 7% at S. maritima stand. Headspace solid-phase microextraction (HS-SPME) combined with Comprehensive Two-Dimensional Gas Chromatography -Time-of-Flight Mass Spectrometry (GC × GC-ToFMS) was used to analyse the volatile and semi-volatile fraction of root exudates. A total of 171 compounds were identified and Principal Component Analysis showed a clear separation between the chemical composition (volatile and semi-volatile organic compounds) of the exudates of the two plants. The patterns of vertical distribution and differences in the proportion of SRB and Archaea in the prokaryote communities developing in sediments colonized by Spartina maritima or Halimione portulacoides suggest the existence of plant-specific interactions between halophyte vegetation and estuarine sediment bacteria in Ria de Aveiro salt marshes, exerted via sediment lithology and root-derived exudates.
机译：这项研究的目的是调查滨海斯巴达尼亚（Spartina maritima）或哈利米奥·波图拉科德斯（Halimione portulacoides）对沉积物林的单特异性定殖对位于葡萄牙里阿德埃罗（Ria de Aveiro）盐沼的底栖原核生物组合的影响。通过荧光原位杂交（FISH）对单种植物林分沉积物和无植被沉积物中细菌，古细菌和硫酸盐还原细菌（SRB）的分布进行了表征。表层沉积物中的原核生物总丰度最高（0.4×10〜9-1.7×10〜9细胞gdw〜（-1））。细菌域约占原核生物总数的40％，其中表层的百分比最高。古细菌细胞平均相当于原核生物总种群的25％，在植被库中具有较高的丰度，并显示出均匀的垂直分布。 SRB的相对丰度约占无植被沉积物和马齿梭菌站4'，6-二mid基-2-苯基吲哚二盐酸盐（DAPI）染色细胞总数的3％，而海生链球菌则占7％。顶空固相微萃取（HS-SPME）结合综合二维气相色谱-飞行时间质谱（GC×GC-ToFMS）分析了根系分泌物的挥发性和半挥发性成分。总共鉴定出171种化合物，主成分分析表明，两种植物的分泌物的化学成分（挥发性有机化合物和半挥发性有机化合物）之间存在明显的分离。在由Spartina maritima或Halimione portulacoides定殖的沉积物中发育的原核生物群落中，SRB和古生菌的垂直分布格局和比例差异表明，Ria de Aveiro盐沼中盐生植物植被和河口沉积物细菌之间存在植物特异性的相互作用，通过沉积物岩性和根系分泌物发挥作用。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2012年第10期|p.61-68|共8页
  • 作者

    Vanessa Oliveira; Ana L. Santos; Claudia Aguiar; Luisa Santos; Angelo C. Salvador; Newton C.M. Gomes; Helena Silva; Silvia M. Rocha; Adelaide Almeida; Angela Cunha;

  • 作者单位

    Department of Biology and CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Biology and CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Biology, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Biology and CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Biology and CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Biology and CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Biology and CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Biology and CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    prokaryote communities; SRB; archaea; salt marsh; root exudates;

    机译：原核生物社区;SRB;古细菌盐沼根分泌物;

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