四列藻在光限制胁迫下的超补偿生长响应

采用海洋微藻四列藻为试验材料,试验前期微藻经光限制(500 LX)胁迫处理10 d,试验后期重新接种并恢复正常光照(5000 Lx)培养10 d,均以正常光照(5 000 Lx)培养作对照,测定四列藻的细胞密度、细胞内蛋白质含量、细胞内糖分含量等指标。结果表明,处理组在恢复工常光照的初期(1～2 d)细胞生长量超过对照(P<0.05),即藻细胞平均相对生长率提高,细胞数增多,叶绿素 a含量和生物量增加,细胞数净增率最高达31.6%,生物量净增率最高达34.8%。同时,四列藻在受到光限制胁迫后,藻细胞内蛋白质、细胞内糖和蛋白质/糖(P/C)的比值发生了变化,但是在恢复正常光照培养后,这几个指标均逐渐恢复至处理前的水平。四列藻的这种受到光胁迫后细胞生长量增加的特征表明微藻具有超补偿性能。

Over-compensatory growth of Tetraselmis tetrathele in response to the stress of light limitation

Micro-alga Tetraselmis tetrathele was used as experimental material. In the initial time of experiment, T.tetrathele had been treated under a stress of light limitation (500 Lx) for ten days, while in the later time, it had been cultured for ten daysafter re-inoculated and recovered normal light (5 000 Lx), and the normal light (5 000 Lx) culture was used as all the controls.In the course of the experiment, density of cells, content of intracellular protein, content of intracellular carbohydrate and otherindexes were determined. The result showed that the treated group had a more amount of cell growth than the control group(P<0.05) in the initial time (1～2 d) after light recovery,that is, the treated group had a higher average relative growth rate, amore number of cells, a more biomass and a higher chlorophy11-a content than those of the control group, in addition, themaximal rate of net cells increase was 31.6%, and the maximal rate of net biomass increase was 34.8%. Meanwhile, theintracellular protein, the intracellular carbohydrate and the ratio of protein to carbohydrate (P/C) changed under the stress oflight limitation, but all of them would return to their initial levels in the following culture after light recovery. The character of T.tetrathele had a more amount of cell growth showed that the micro-algae had an overcompensatory ability.