摘要
大气同温层的臭氧层逐渐被破坏导致太阳辐射中的UV B辐射部分抵达地球表面增加 ,对陆生植物产生不同程度的影响 .本文讨论了UV B辐射对陆生植物在分子和器官水平的影响 ,植物可能通过UV B光受体吸收低水平UV B辐射 ,并通过不同信息途径转导 ,这包括钙、激酶和活性氧等 ,UV B辐射诱致基因活性变化 ,并改变植物的形态和功能 ,暴露在UV B辐射下大量基因表达发生变化 ,包括调节编码保护色素、DNA修复蛋白的基因和光合基因等 .UV B辐射引起光合作用、生长和生物量降低 ,极少数植物增加生物产量 ,整体群体生物量倾向减少 .UV B辐射对热带亚热带森林树种影响的报道甚少 ,目前增高UV B辐射对生态系统的影响应得到重视 .参 4
Gradual depletion of stratospheric ozone layer in atmosphere has lead to increase in solar UV-B radiation that reaches earth surface. The enhanced UV-B radiation would affect terrestrial plants in various extents. This review deals with the effect of UV-B radiation on terrestrial plants at molecular and organism levels. The perception of low levels of UV-B probably occurs via a UV-B photo receptor followed by different signaling pathways including calcium, kinase and reactive oxygen species. The direct UV-B radiation on plants that results in changes in form or function of plants appears to occur often through altered gene activity. Exposure of plants to UV-B radiation results in changes in expression of large number of genes. The genes indentified being regulated by UV-B encode protein involved in the biosynthesis of protective pigment, DNA repair and photosynthetic genes, etc. UV-B-mediated reductions in photosynthesis and growth. And biomass production can be decreased by elevated UV-B and very few plant species were stimulated to increase production. For the entire population a tendency toward negative effects occurred. Relatively little information exists on the effects of UV-B radiation on tropical and subtropical forest tree species. By now much attention on the ecosystem level consequences of elevated UV-B radiation needs to be paid. Ref 45
出处
《应用与环境生物学报》
CAS
CSCD
2004年第1期122-127,共6页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目 (No .30 2 70 2 39)
广东省自然科学基金团队项目 (No.0 0 30 31 )资助~~
