Effects of nitrogen and phosphorus limitation on cyst formation of Scrippsiella trochoidea
Effects of nitrogen and phosphorus limitation on cyst formation of Scrippsiella trochoidea
复制标题
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Zhang Yu
中科院分区：
文献类型：
--
作者：
Zhang Yu
氮（N）和磷（P）限制的影响（N：500μg·L-1，P：74~0.74μg·L-1，P：74μg·L-1，N：通过室内试验，研究了不同浓度（500~5μg·L-1）对锥状斯氏藻（Scrippsiella trochoidea（Stein）Loeblch III）生长和孢囊形成的影响，结果表明：在有限的营养条件下，锥状斯氏藻的比生长速率极低，磷限制对生长的影响更为明显，最终包囊形成率为15%~ 99%，氮素亏缺促进了包囊的形成，中度氮素亏缺时包囊形成率最高，接近100%。在营养细胞数达到最大值后的指数生长期结束时出现包囊形成，而在低营养条件下，结果表明，稳定期的孢囊形成减少了锥状链霉菌的细胞数量，在一定程度上加速了其水华的消散。
The effects of nitrogen(N) and phosphorus(P) limitation(N: 500μg.L-1,P: 74～0.74μg.L-1 and P: 74μg.L-1,N: 500～5μg.L-1) on the growth and cyst formation of Scrippsiella trochoidea(Stein) Loeblch III were studied by a series of indoor experiments.Results showed the specific growth rate was significantly low under limited nutrient condition,and effects of P limitation on growth were more obvious.The final cyst formation rates varied from 15% to 99%.Nitrogen depletion enhanced the cyst formation,and the highest encystment rate,nearly close to 100% under the condition of moderate N depletion.Generally,encystment occurred at the end of the exponential phase following the maximum numbers of vegetative cells.However,cysts were observed in the second day under low nutrient conditions,partly due to the sharp decrease of nutrient concentrations after inoculation.The present results suggested that cyst formation in the stationary stage reduce the cell number of S.trochoidea,which accelerate the dissipation of its bloom to some extent.