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| Over-compensatory growth of Tetraselmis tetrathele in response to the stress of light limitation |
| GUO Yu-feng1,2, DUAN Shun-shan1, LI Ai-fen1, LIU Zhen-qian1, XU Ning1 |
| 1. Institute of Hydrobiology, Jinan University Guangzhou 510632, China; 2. Guangdong Science Center, Guangzhou 510033, China |
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Abstract 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.
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Received: 25 February 2004
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