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.
曹宇, 张玉娟, 王朝晖*. 氮磷限制对锥状斯氏藻孢囊形成的作用[J]. , 2006, 25(1): 17-20.
CAO Yu, ZHANG Yu-Juan, WANG Zhao-Hui. Effects of nitrogen and phosphorus limitation on cyst formation of Scrippsiella trochoidea. , 2006, 25(1): 17-20.
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