| 中国东海二甲基巯基丙酸内盐(DMSP)合成与降解菌的水平和垂直分布 |
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| 引用本文： | 孙浩,谭斯尹,梁金昌,杨桂朋,辛宇,张晓华.中国东海二甲基巯基丙酸内盐(DMSP)合成与降解菌的水平和垂直分布[J].微生物学报,2020,60(9):1865-1881. |
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| 作者姓名： | 孙浩 谭斯尹 梁金昌 杨桂朋 辛宇 张晓华 |
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| 作者单位： | 广州大学大湾区环境研究院, 珠三角水质安全与保护教育部重点实验室, 广东 广州 510006;中国科学院南海海洋研究所, 热带海洋环境国家重点实验室, 广东 广州 510301;广州大学大湾区环境研究院, 珠三角水质安全与保护教育部重点实验室, 广东 广州 510006;广州大学环境科学与工程学院, 广东 广州 510006 |
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| 基金项目： | 国家自然科学基金（91851111）；广东省自然科学基金粤穗联合基金（2019B1515120066） |
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| 摘 要： | 【目的】二甲基巯基丙酸内盐(dimethylsulfoniopropionate,DMSP)及其裂解产物二甲基硫(dimethyl sulfide,DMS)在海洋硫循环中发挥重要作用。目前关于DMSP降解细菌的分布已有部分报道,但其合成细菌的研究才刚刚起步。本文拟研究中国东海水体DMSP合成与降解菌及基因的水平和垂直分布(1000m水深)差异,分析其对环境梯度变化的响应。【方法】利用流式细胞仪计数海水样品中微微型浮游生物的数量,通过荧光定量PCR和高通量测序手段定量测定DMSP合成基因(dsy B和mmt N)及物种、DMSP降解基因(ddd P和dmd A)及物种的丰度,分析其在东海海域水平及垂直方向上的分布差异。【结果】在垂直方向上,聚球藻、原绿球藻、微微型真核生物和异养细菌丰度随着水深的增加而先增后减,最大值位于30–50m附近。表层(4m左右)水体的DMSP合成及降解基因丰度最高,DMSP合成菌(如Alteromonas、Phaeobacter和Pelagibaca等)丰度也最高;随着水深增加,表层以下水体中DMSP合成及降解基因和物种丰度先增加后降低,峰值均出现在100–150 m;100 m以下,DMSP降解基因丰度迅速下降,而合成基因丰度下降程度较低,而且接近底层(500 m)时出现随水深逐渐增加的趋势。水平方向二者变化规律不明显。浅层水体(≤100 m)和深层水体(100 m)细菌群落结构存在显著差异,前者拥有较高比例的黄杆菌纲、放线菌纲和蓝细菌纲细菌,后者α变形菌纲细菌丰度较高。【结论】100m及以浅和100m以深的浮游细菌群落结构存在显著差异。表层水体中DMSP合成和降解细菌的丰度最高,100–150 m水体次之,但100–1022 m介导的DMSP合成和降解细菌丰度的变化趋势有较大差别。
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| 关 键 词： | N2O的排放 硝化过程 不完全反硝化过程 河口近海环境 |
| 收稿时间： | 2020/3/2 0:00:00 |
| 修稿时间： | 2020/5/6 0:00:00 |
Horizontal and vertical distribution of dimethylsulfoniopropionate (DMSP) producing and catabolizing bacteria in the East China Sea |
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| Hao Sun,Siyin Tan,Jinchang Liang,Gui-Peng Yang,Yu Xin,Xiao-Hua Zhang.Horizontal and vertical distribution of dimethylsulfoniopropionate (DMSP) producing and catabolizing bacteria in the East China Sea[J].Acta Microbiologica Sinica,2020,60(9):1865-1881. |
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| Authors: | Hao Sun Siyin Tan Jinchang Liang Gui-Peng Yang Yu Xin Xiao-Hua Zhang |
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| Institution: | Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay Area, Guangzhou University, Guangzhou 510006, Guangdong Province, China;State Key Laboratory of Tropical Oceanography(LTO), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, Guangdong Province, China;Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay Area, Guangzhou University, Guangzhou 510006, Guangdong Province, China;School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, Guangdong Province, China |
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| Abstract: | Nitrous oxide (N2O) is a powerful greenhouse gas, and also the main compound causing stratospheric ozone depletion. The ocean is an important source of N2O emission to the atmosphere, and N2O in the ocean is mainly produced by the microbial-mediated nitrogen biogeochemical cycle. This paper firstly reviews the marine N2O emission flux, the distribution characteristics of seawater N2O and environmental impact factors. Then, the microbial processes regulating the N2O production and emission are discussed. At last, we address the N2O biogeochemical process based on the relationship between low oxygen and N2O production in the estuarine and coastal ecosystems. |
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| Keywords: | N2O emissions nitrification incomplete-denitrification estuarine and coastal environment |
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