连续两年UV-B辐射增强对割手密叶绿素含量的影响

研究了大田栽培和自然光条件下,连续两年模拟紫外辐射(UV-B,280~315 nm)增加对92-11和93-25两个割手密无性系叶绿素含量的影响。结果表明,割手密92-11在UV-B辐射的影响下,叶绿素含量降低,而割手密93-25抗性很强,在增加了5 kJ/m2UV-B辐射下,其叶绿素含量增加。割手密叶绿素含量对UV-B辐射的响应具有种内差异。割手密92-11对紫外辐射的抗性在2004年比2003年强,而割手密93-25则相反。生育期中开花期受UV-B辐射影响最大,然后是分蘖期,伸长期抗性较强。

Effects of Enhanced UV-B Radiation on Chlorophyll Content of Wild Sugarcane (Saccharum spontaneum L.) Clones for Two Consecutive Years

The research was about the effects of enhanced UV-B radiation on chlorophyll content of two wild sugarcane(Saccharum spontaneum L.) clones for two consecutive years in field condition.The results showed that clone 93-25 was more resistent than clone 92-11.Chlorophyll content of clone 92-11 decreased while that of clone 93-25 increased under 5 kJ/m2 UV-B radiation.Interspecific difference in chlorophyll content of wide sugarcanes existed.Clone 92-11 was more resistent in 2004 than 2003 while clone 93-25 was opposite change.The clones were more sensitive in their flowering stage than tillering stage,and the elongating stage was the most resistent stage.