20个小麦品种对UV-B辐射增强响应的形态学差异

摘要

研究了大田栽培和自然光条件下，模拟UV-B辐射增强对20个小麦品种影响的形态学差异。结果表明，叶面积指数、株高、节间长、茎基粗对UV-B辐射增强响应具有品种间差异。株高和节间长对UV-B辐射响应具有一致性，呈极显著正相关。根据形态响应指数(MRI)，耐性品种(MRI＞－8.5)为：辽春9＞文麦3＞大理905＞兰州80101＞绵阳26＞YV 97-31＞毕90-5。敏感品种(MRI＜-49.4)为：会宁18＞繁19＞楚雄8807＞My 94-9＞黔14＞云麦39＞陇春16。耐性品种具有较小的叶展开角度，敏感品种具有较大的叶展开角度。UV-B辐射还不同程度抑制小麦条锈病的发生。%Differences in morphological response of 20 wheat cultivars to enhanced ultraviolet radiation(UV-B,280～315 nm) were investigated under field conditions. Results showed that differences were observed in LAI,plant height,internode length and stem diameter between the cultivars. The responses of the cultivars in plant height and internode length were consistent and in significant positive relationship. Based on morphological response index(MRI),tolerant cultivars (MRI＞－8.5) include Liaochun 9＞Wenmai 3＞Dali 905＞Lanzhou 80101＞Mianyang 26＞YV 97-31＞Bi 90-5,and sensitive cultivars(MRI＜－49.4) include Huining 18＞Fan 19＞Chuxiong 8807＞My 94-9＞Qian 14＞Yunmai 39＞Longchun 16. Smaller angles of spread of leaves of the tolerant cultivars and wider angles of the sensitive cultivars were observed.Effect of UV-B radiation inhibiting incidence of stripe rust disease on wheat was also discovered.