连续两年UV-B辐射增强对割手密叶绿素含量的影响

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

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，280～315nm）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5kJ/m^2 UV-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。

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 resuits 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/m^2 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.