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首页> 外文期刊>Marine ecology progress series >Significant nitrogen fixation activity associated with the phyllosphere of Mediterranean seagrass Posidonia oceanica: first report
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Significant nitrogen fixation activity associated with the phyllosphere of Mediterranean seagrass Posidonia oceanica: first report

机译：与地中海海草波塞冬大洋的根系相关的显着固氮活性：首次报告

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摘要

The present study provides first estimates of dinitrogen (N-2) fixation activities associated with the phyllosphere of Posidonia oceanica in the Mediterranean Sea. N2 fixation rates in the phyllosphere reached values up to 2.53 mu g N gDW h(-1) or 15.2 mg N m(-2) d(-1) (integrated to daily rates and by areal basis), which is higher than most rates reported in the phyllosphere of tropical seagrasses. These rates can potentially supply the total N demand of P. oceanica and may contribute significantly to the N budget in the Mediterranean Sea. Our results showed differences in N-2 fixation rates among leaf segments of different age with higher activities in older segments that were heavily epiphytized and higher activities during summer when epiphyte biomass accumulation was higher than in spring. N-2 fixation activities occurred during day and night, suggesting that the community of N-2 fixers in the phyllo sphere of Posidonia oceanica is complex and is not attributable to a single group of diazotrophs. Molecular analysis of nifH genes (coding for the nitrogenase enzyme) of epiphytic samples in the phyllosphere of P. oceanica revealed bacterial nifH sequences, closely related to as-yet uncultured and unidentified bacteria. To support the ecological importance of N-2 fixation in P. oceanica beds, more measurements with wider spatial and temporal scope are needed.
机译：本研究提供了与海洋中波塞冬菌的叶际相关的二氮（N-2）固定活性的初步估计。叶面中的N2固定率最高达到2.53μg N gDW h（-1）或15.2 mg N m（-2）d（-1）（按每日比率和按面积计算），该值高于大多数热带海草的叶缘报道的比率。这些比率有可能满足大洋对虾的总氮需求，并可能大大增加地中海的氮预算。我们的研究结果表明，不同年龄的叶段之间的N-2固定率存在差异，其中较高的年龄段是高附生植物，而较高的活性是夏季，而附生植物生物量的积累高于春季。 N-2固定活动发生在白天和黑夜，这表明大洋波塞冬（Posidonia oceanica）叶层N-2固定物的群落很复杂，不能归因于单一的重氮营养菌。对大洋假单胞菌叶球附生样品的nifH基因（编码固氮酶）的分子分析显示，细菌nifH序列与尚未培养和未鉴定的细菌密切相关。为了支持在海生疟原虫床上固定N-2的生态重要性，需要更多具有更宽时空范围的测量。

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  • 来源
    《Marine ecology progress series》 |2016年第9期|53-62|共10页
  • 作者

    Agawin Nona S. R.; Ferriol Pere; Cryer Callum; Alcon Elena; Busquets Antonio; Sintes Eva; Vidal Constanza; Moya Gabriel;

  • 作者单位

    Univ Isl Baleares, Dept Biol, Interdisciplinary Ecol Grp, Palma De Mallorca 07122, Spain;

    Univ Isl Baleares, Dept Biol, Interdisciplinary Ecol Grp, Palma De Mallorca 07122, Spain;

    Univ Portsmouth, Sch Biol Sci, Portsmouth PO1 2DY, Hants, England;

    Univ Isl Baleares, Dept Biol, Interdisciplinary Ecol Grp, Palma De Mallorca 07122, Spain;

    Univ Isl Baleares, Dept Biol, Interdisciplinary Ecol Grp, Palma De Mallorca 07122, Spain;

    Univ Vienna, Dept Marine Biol, Althanstr 14, A-1090 Vienna, Austria;

    Univ Isl Baleares, Dept Biol, Interdisciplinary Ecol Grp, Palma De Mallorca 07122, Spain;

    Univ Isl Baleares, Dept Biol, Interdisciplinary Ecol Grp, Palma De Mallorca 07122, Spain;

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  • 正文语种 eng
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  • 关键词

    Nitrogen fixation; Posidonia oceanica; Mediterranean Sea;

    机译：固氮;大洋波塞登;地中海;

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