中文摘要：

本文初步研究了一定浓度范围内的2，4-D对雨生红球藻积累虾青素的影响。在对数生长期的藻液中分别加入一系列不同浓度的2，4-D溶液，然后进行胁迫培养（25℃、24h、5000Lx连续光照＋营养盐饥饿），诱导细胞内虾青素的合成积累。在诱导过程中，显微观察不同浓度2，4-D处理后细胞形态和虾青素积累的动态变化，并定期取样测定虾青素含量。结果表明，20．0mg／L的2，4-D能够明显促进雨生红球藻中积累虾青素。它不仅可以加快虾青素积累进程（比对照提前15d），而且比对照能提高13．4％的虾青素产量。

英文摘要：

Effect of extraneous 2,4-D on astaxanthin accumulation in H. pluvialis was studied in this paper. After different concentration grades of 2,4-D were added into the vegetative green cells respectively, then H. pluvialis were cultivated under unfavorable growth conditions （24 h light cycle, 5000 Lx, 25℃, nutrition deficiency） to promote astaxanthin accumulation. In this stage, morphological changes of cells treated by different grades of 2,4-D concentration were observed with optical microscopy. Moreover, astaxanthin content was determined with absorption spectral （00490）. Results showed that astaxanthin accumulation might be promoted at 20 mg/L 2,4-D treatment which could quicken astaxanthin accumulation 15 days compared with blank controls. Moreover, the increasing production extents of astaxanthin reached 13.4% than blank controis.