STUDY ON THE REPRODUCTIVE BIOLOGY of HEMIAULUS SINENSIS GREVILLE: Ⅰ. CELL DIVISION AND ENVIRONMENTAL FACTORS
- 生命科学－已发表论文 
中华半管藻以频繁的细胞分裂进行繁殖。实验结果表明，该藻每天的细胞分裂和叶绿素合成呈现一定的节律性，在光暗各12H条件下，每天光照8H后形成最大的分裂高峰，黑暗后2H出现分裂次高峰。进入光照期，叶绿素合成开始，继之增长率急剧上升，8H后达到最高值，黑暗期细胞增殖率和叶绿素增长率迅速下降，并降至全日最低值。适温范围为8-32℃，生长的最适温度在25-30℃之间，适盐范围为7-50，最适盐度为28左右，最适光照强度为75μEIn·M￣＿（-2）·S￣（-1）.同时根据实验结果，建立了中华半管藻种群生长与环境因子关系的多元回归动态模型。ell division was Found to be the major reproductive manner of Hemiaulus sinensis, an estuarine diatom. The experimental results revealed that this species present a diurnal period-icity in cell division and chlorophyll synthesis.Under a 12hL:12hD condition,the highestpeak of cell division appeared aFter 8 hour illumination, and the second peak appeared aFter 2hour darkness ,while chlorophyll synthesis had also got the highest peak aFter 8 hour illumi-nation and then decreased gradually to the lowest value at the end of the dark.H.sinensis had an optimal salinity of 28,a suitable salinity in the range of 7-50,an optimal temperature inthe range of 25-30℃,and a saturated light intensity of 75 μEin.m￣(-2).s￣(-1), For its growth.Dy-namic surFace models based on multiple regression were developed to represent the overall re-lationship between the reproductive rate(μ)of this diatom species and the environmentalconditions,It was thus concluded that H.sinensis was a subtropical and wide-rage-of salini-ty adapted species of algae.