Dimethylsulfoniopropionate production by psychrophilic diatom isolates
Dimethylsulfoniopropionate production by psychrophilic diatom isolates
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DOI：
10.1111/j.1529-8817.2004.03122.x
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发表时间：
2004-10-01
影响因子：
2.9
通讯作者：
Fukuchi, M
中科院分区：
文献类型：
--
作者：
Kasamatsu, N;Hirano, T;Fukuchi, M
对嗜冷性硅藻菌株Chaetoceros sp.、Navrula sp.和Nitzschia sp.产生DMSP的能力进行了实验分析。所有菌株在1.7℃的低温培养条件下生长迅速(0.3~0.5d(-1))。角毛藻的DMSP浓度(颗粒态DMSPp和溶解态DMSPd)可以忽略不计，而螺旋藻的DMSP浓度很低。和菱形藻Nitzschia sp.在为期56天的实验接近尾声时有所增加。后两个物种的DMSPp/Chla比值在指数生长期早期约为5，到稳定期略有下降。在固定相期间，当Chla和荧光保持不变时，这两个物种的比例线性增加，最高可达固定相开始时的约6.5倍。硅藻这种与生长有关的DMSP产生可能导致在自然条件下硅藻水华早期观察到的低浓度DMSPp。
Dimethylsulfoniopropionate (DMSP) production by psychrophilic diatom strains, Chaetoceros sp., Navicula sp., and Nitzschia sp., were experimentally analyzed. All strains showed rapid growth (0.3-0.5 d(-1)) under cold culture conditions (1.7degreesC). DMSP concentrations (both as particulate, DMSPp, and dissolved, DMSPd) were negligible in cultures of Chaetoceros sp., whereas those for Navicula sp. and Nitzschia sp. increased toward the end of the 56-day experiments. The ratio of DMSPp:chl a of the latter two species was approximately 5 in the early exponential growth phase and decreased slightly toward the early stationary phase. During the stationary phase, when chl a and fluorescence remained constant, the ratios in both species increased linearly by up to approximately 6.5 times the value at the start of the stationary phase. This growth-related DMSP production by diatoms may result in the low concentrations of DMSPp observed in the early stage of diatom blooms under natural conditions.