细菌浮游生物生长产量：季节性变化及与基质可利用性和β-葡萄糖苷酶活性的耦合。
Bacterioplankton Growth Yield: Seasonal Variations and Coupling to Substrate Lability and beta-Glucosidase Activity.
机构信息
Freshwater Biological Laboratory, University of Copenhagen, Helsingørsgade 51, DK-3400 Hillerød, Denmark.
出版信息
Appl Environ Microbiol. 1993 Nov;59(11):3916-21. doi: 10.1128/aem.59.11.3916-3921.1993.
Abstract
The seasonal variation in the carbon growth yield of pelagic bacteria in the eutrophic lake Frederiksborg Slotssø was studied. The growth yield was determined in dilution culture experiments, in which a substrate of dissolved organic carbon (DOC) from the lake was incubated with a natural bacterioplankton assemblage. Bacterial growth efficiency varied annually from 8 to 60% with an average (and standard deviation) of 41 +/- 11% (n = 29). Simultaneous measurements of growth yield, substrate lability (DOC(L)), chlorophyll and bacterial production, abundance, and extracellular enzymatic activity revealed new aspects of the regulation of bacterial DOC utilization. Growth yield correlated positively to DOC(L) and negatively to beta-d-glucosidase activity. These results indicated a close coupling between the substrate conditions and the physiological response of the bacteria. The large variations in yield within a few days and the close coupling to substrate availability showed that one single global carbon yield factor cannot be expected to apply in pelagic systems.
摘要
研究了富营养化湖泊弗雷德里克斯堡湾浮游细菌的碳生长产量的季节性变化。通过稀释培养实验来确定生长产量，其中用来自湖泊的溶解有机碳（DOC）作为底物，与自然浮游细菌群落一起培养。细菌生长效率每年变化范围为 8%至 60%，平均值（和标准差）为 41%+/-11%（n=29）。同时测量生长产量、底物易变性（DOC(L)）、叶绿素和细菌生产力、丰度以及细胞外酶活性，揭示了细菌利用 DOC 的调控的新方面。生长产量与 DOC(L)呈正相关，与β-葡萄糖苷酶活性呈负相关。这些结果表明，细菌的生理反应与底物条件密切相关。在几天内产量的巨大变化以及与底物可用性的密切耦合表明，在浮游系统中不能期望使用单一的全球碳产量因素。
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