| 摘要: |
| 研究了光照强度2 500～20 000 lx 对孔石莼(Ulva pertusa)生长和藻体生化组成的影响。研究结果表明, 光照强度对孔石莼的生长率具有明显的影响(P<0.05), 孔石莼在光照强度为12 500 lx 时有最大的生物量积累。光照强度低于12 500 lx 时, 孔石莼的生长率有随着光照强度的降低而减小的趋势; 光照强度高于12 500 lx 时, 孔石莼的生长率随着光照强度的升高而降低(P<0.05)。不同光照强度对孔石莼的叶绿素、可溶性糖和游离脯氨酸的含量具有明显的影响(P<0.05)。随着光照强度的增加, 孔石莼的叶绿素a 和叶绿素b 的含量逐渐变小; 低光照条件也促进了孔石莼蛋白质的积累; 当光照强度超过17 500 lx 时, 游离脯氨酸的含量明显增加。光照强度对孔石莼化学组成也具有明显的影响(P<0.05)。随着光照强度的升高, 藻体的N 元素含量有所升高, 但光强达到17 500 lx 后, 随着光强的增加, N 元素含量反而降低; C 元素的含量在光照强度达到17 500 lx 后, 含量也明显升高; H 元素的含量在光照强度2 500～20 000 lx 范围内, 具有随着光照强度增加而增加的趋势。 |
| 关键词: 光照强度 孔石莼(Ulva pertusa) 生长 藻体组成 |
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| 基金项目:国家十一五支撑计划项目(2006BAD09A01); 国家863 计划项目(2006AA10Z409); 海洋公益性行业科研专项(200905020-2);国家海洋局近岸海域生态环境重点实验室基金(200801) |
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| The effects of light intensity on the growth and chemical constituents of Ulva pertusa |
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WANG Qiao-han,DONG Shuang-lin,TIAN Xiang-li,WANG Fang,DONG Yun-wei,ZHANG Kai
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| Abstract: |
| The influence of light on the growth and chemical constituents of Ulva pertusa thalli were investigated. When light intensity was below 12500 lx, the growth rate of U. pertusa was positively correlated with the light intensity; but this trend was reversed when light intensity was above 12500 lx (P< 0.05). Analysis of chemical constituents at the final stages of thalli growth revealed that the contents of chlorophyll a and chlorophyll b decreased with the increase of light intensity (P<0.05). The synthesis of protein was accelerated at low light intensity. In addition, levels of osmolytes (free proline) at 17500 lx and 20000 lx were significantly higher than those at other light intensities (P< 0.05). The content of nitrogen increased when the light intensity was increased from 2500 to 15000 lx. However, this trend was reversed when the light intensity exceeded 17500 lx. The content of carbon had similar trends. Moreover, the content of hydrogen increased with the increase of light intensity. |
| Key words: light intensity Ulva pertusa growth chemical constituents |
