UV-B辐射对孔石莼孢子生长发育的影响

Effects of UV-B radiation on the growth of Ulva pertusa Kjellman spores

运用实验生态学的方法,研究了UV-B辐射对孔石莼孢子生长发育的影响,结果表明:孔石莼孢子发育早期外形主要呈现棒状和蝌蚪状,其中棒状占90.68%±2.50%。UV-B辐射对孔石莼孢子生长发育有明显的抑制作用,而且随着辐射剂量的增加,抑制作用愈加明显。在30 d时,受到不同剂量UV-B辐射的孔石莼幼苗均出现了死亡,死亡率随着UV-B辐射剂量的增加而升高。UV-B辐射会使孔石莼幼苗叶绿素a含量明显下降,而丙二醛含量会有不同程度的升高,因此细胞分裂受阻,叶绿素和细胞膜系统受到破坏是孢子生长发育受到抑制和幼苗死亡的原因之一。

The effects of UV-B radiation on the growth of Ulva pertusa Kjellman spores were studied by experimental ecological methods. The results showed that the growth morphology of Ulva pertusa Kjellman spores was mainly rod shape and tadpole shape. The percentage of rod shape was 90. 68% ± 2. 50%. UV-B radiation could inhibit the growth of Ulva pertusa Kjellman spores,and the growth inhibition was more significant with the increased doses of UV-B radiation treatment. On the day 30,Ulva pertusa Kjellman seedling had emerged death under UV-B radiation,and the death rate was increased with the increased doses of UV-B radiation treatment. The chlorophyll a contents of Ulva pertusa Kjellman seedling were significantly decreased,while MDA contents were increased by UV-B radiation. Therefore,the reasons of Ulva pertusa Kjellman seedling growth inhibition and death were cell division,chlorophyll and cell membrane system damage.