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UV-B辐射增强对孔石莼生长和孢子萌发的影响
王展¹, 孙彬凯¹, 刘雪华², 郇丽², 王广策², 秦雨彤¹, 刘家赫¹, 陈雨¹, 奚鹤鸣¹
1.山东省青岛第五十八中学;2.中国科学院海洋研究所

摘要:

20世纪以来，工业化进程加速使得臭氧层被破坏，到达地表的UV-B增强，对潮间带生物的生长和发育可能产生一系列影响。本实验研究了UV-B对潮间带海藻—孔石莼生理活性和孢子萌发的影响，设置了不同的辐射强度，测定了孔石莼的相对生长率、光合生理活性以及孢子的萌发情况。研究结果显示，UV-B抑制孔石莼的生长，随着辐射强度的增加，抑制作用加强，同时也会抑制孢子的萌发，4 kJ/m2的辐射强度即可达到明显的抑制作用。此外，UV-B辐射使孔石莼的叶绿素荧光参数（Fv/Fm、YI、YII）降低，随着处理时间的延长，孔石莼的光合生理活性显著降低。相对于光系统I，光系统II对于UV-B造成的环境胁迫更为敏感。本研究为UV-B可能影响其他潮间带生物或生态系统的研究提供了理论基础。

关键词: 孔石莼 UV-B 孢子萌发光合活性

DOI：10.11759/hykx20180605001

分类号:

基金项目:

The effect of UV-B radiation enhancement on the growth and spore germination of Ulva pertusa

Wang Zhan¹, Sun Binkai¹, Liu Xuehua², Huan Li², Wang Guangce², Qin Yutong¹, Liu Jiahe¹, Chen Yu¹, Xi Heming¹

1.Qingdao No.58 High School;2.Institute of Oceanology, Chinese Academy of Sciences

Abstract:

Since the 20th century, the ozone layer was destroyed and UV-B radiation reaching the surface enhanced due to the acceleration of industrialization, which may have a series of effects on the growth and development of intertidal organisms. In this study, the relative growth rate, photosynthetic activity and spore germination of Ulva pertusa in different UV-B radiation were determined. The results showed that the growth, photosynthetic activity and spore germination of U. pertusa were inhibited by UV-B, and the inhibition was strengthened along with the increase of UV-B radiation intensity. Compared with photosystem I, photosystem II was more sensitive to the environmental stress caused by UV-B. This study provided a theoretical basis for the possible influences of UV-B on other intertidal organisms or ecosystems.

Key words: Ulva pertusa UV-B spore germination photosynthetic activity