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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
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