不同 pH和盐度下海洋细菌对赤潮藻生长和产毒的影响

Effects of marine bacteria on the growth and toxin production of red-tide algae under different pH and salinities

研究了在可控生态条件下 ,一株分离自厦门西海域沉积物的海洋细菌S10 在不同pH和盐度条件下对赤潮原因种塔玛亚历山大藻 (Alexandriumtamarense)生长和产毒的影响 .结果表明 ,实验用藻株适宜生长 pH为 6～ 8,适宜盐度为 2 0～ 34;该藻株在不同pH及不同盐度条件下 ,藻细胞毒力差异显著 ,且随着pH升高而下降 ,随着盐度增加而加大 ,到盐度为 30时达到最高值 ,然后逐渐下降 ;菌株S10 (1.0 2× 10 10cells·ml-1)在pH 7～ 9和盐度 15～ 34下均能有效抑藻生长和产毒 ,且在 pH 7、盐度 34时其抑藻生长作用最强 ;在 pH 7时抑藻产毒效果较好 ,且其抑藻产毒作用强度不随盐度变化而异 .

The effects of strain S 10 isolated from sediments of Xiamen Western Sea Area on the growth and paralytic shellfish poison (PSP) production of Alexandrium tamarense at different pH and salinities were studied. The results showed that the alga grew well at pH 6～8 and at salinity of 20～34. The toxicity of A. tamarense varied markedly at different pH and salinities:it decreased with increasing pH,while increased with salinity and reached its peak value at the salinity of 30, and then declined. The strain S 10 inhibited the growth and the PSP production of A. tamarense at different pH and salinities.It had the best inhibitory function on the growth of A. tamarense at pH 7 and salinity of 34. The best inhibitory function on the PSP production of A.tamarense was at pH 7, but this inhibitory function was not related to salinity.