摘要
研究了低中高 3种Zn2 + 浓度下 ,赤潮藻微小原甲藻的生长和生理响应 .结果表明 ,低Zn(1.4pmol·L-1)下 ,藻细胞的比生长速率和稳定期生物量分别为 0 .4 0d-1和 5 110 0cell·ml-1.当Zn2 + 浓度超过2 4 .4pmol·L-1时 ,提高Zn2 + 浓度 (181.6pmol·L-1) ,藻细胞的比生长速率没有改变 ,为 0 .93d-1,而稳定期生物量则略有下降 ,但均明显高于低Zn条件下藻细胞的比生长速率和稳定期生物量 .Zn限制条件下藻细胞的叶绿素a合成受到影响 ,藻细胞光合作用需在更高光强下达到饱和 .随着Zn2 + 浓度增加藻细胞光饱和的光合作用速率 (Pm)及光合作用效率 (α)均明显增大 .研究表明 ,富营养化水体中 ,高的Zn浓度是一定条件下触发赤潮藻类爆发性增殖的重要因子之一 .
Studies on the growth and physiological response of red tide alga Prorocentrum minimum to three Zn 2+ levels were showed that the specific growth rate and biomass were limited in low Zn 2+-grown cells (1.4 pmol·L -1, which were 0.40 d -1 and 51100 cell·ml -1 respectively. The specific growth rate was not significantly different when the Zn 2+ concentration in medium was increased over 24.4 pmol·L -1,but there was a slight decrease in biomass; however, both specific growth rate and biomass were much higher than those in low Zn 2+-grown cells. It was also showed that chlorophyll a synthesis was limited due to Zn 2+ deficient,and therefore,the cells became light saturated at higher irradiance under Zn-limited condition. Light-saturated photosynthetic rates (Pm) and photosynthetic efficiency (α) increased significantly with increasing Zn 2+ concentrations. It was concluded that Zn 2+ concentration might be one of the key factors affecting red tide blooms in eutrophication environment.
出处
《应用生态学报》
CAS
CSCD
2003年第7期1140-1142,共3页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目 ( 2 0 0 1CB40 970 6)
国家自然科学基金资助项目 ( 2 0 1760 60 ) .
关键词
赤潮
光合作用
生长
微小原甲藻
锌限制
Red tide, Photosynthesis, Growth, Prorocentrum minimum, Zinc limitation
