Sulphate reduction associated with roots and rhizomes of the marine macrophyte Zostera marina
Sulphate reduction associated with roots and rhizomes of the marine macrophyte Zostera marina
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DOI：
10.3354/ame015311
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发表时间：
1998-08-31
影响因子：
1.4
通讯作者：
Finster, K
中科院分区：
文献类型：
--
作者：
Blaabjerg, V;Finster, K
研究了无沉积物海草大叶藻根和根茎中硫酸盐还原菌的活性、位置和氧敏感性。硫酸盐还原率测定处理后的根和根茎与次氯酸盐或暴露于空气中。未处理的根和根茎作为对照。一般来说，根以及根茎相关的硫酸盐还原率很高（20至50 μ mol SO 42- gdw（-1）d（-1））。表面灭菌后，硫酸盐还原率下降了约90%，表明大多数硫酸盐还原剂与根和根茎的表面。在0至20%氧气（以2%为增量）的情况下预孵育根8小时不会影响缺氧条件下随后测定的硫酸盐还原速率。这表明根表面相关硫酸盐还原剂对氧气的耐受性很高。
The activity, the location and the oxygen sensitivity of sulphate reducers associated with sediment-free roots and rhizomes of the seagrass Zostera marina were investigated. Sulphate reduction rates were determined after treatment of roots and rhizomes with hypochlorite or exposure to air. Untreated roots and rhizomes served as controls, In general, root-as well as rhizome-associated sulphate reduction rates were high (20 to 50 mu mol SO42- gdw(-1) d(-1)). After surface sterilisation, the sulphate reduction rates decreased by about 90 %, indicating that most of the sulphate reducers were associated with the surface of the roots and rhizomes. Pre-incubation of roots for 8 h in the presence of 0 to 20% oxygen (in steps of 2 %) did not affect the sulphate reduction rates determined posterior under anoxic conditions. This demonstrates a high tolerance of root surface-associated sulphate reducers towards oxygen.