摘要： 为了探讨玉米不同自交系对UV-B辐射增强的响应,在摸拟光照培养条件下,研究了增强UV-B辐射对玉米不同自交系气体交换参数的影响。结果表明,五叶期UV-B辐射处理6 d后,供试的48个自交系中近一半以上材料的幼苗叶片光合速率、气孔导度和蒸腾速率显著降低10%以上,其材料比例分别为64.6%,47.9%,54.2%;而有62.5%的材料胞间CO₂浓度表现为显著增加;相关分析发现,气孔导度与蒸腾速率对UV-B辐射增强的响应值间存在极显著正相关关系;根据气体交换参数对UV-B辐射增强的响应程度将48个材料分成6类,其中对增强UV-B辐射反应比较敏感的材料和能够忍耐UV-B辐射增强的材料均占12.5%。说明玉米不同自交系幼苗叶片气体交换参数对UV-B辐射增强反应敏感程度具有显著的基因型差异,从中能够筛选出对UV-B辐射增强反应敏感和有忍耐能力的材料。

关键词: 玉米, 自交系, UV-B, 气体交换

Abstract: To explore responses of maize seedlings in different inbreed lines to enhanced ultraviolet- B radia- tion，48 inbreed lines were planted in artificial culturing room with 2 treatment groups．One group is the control and another group was treated with enhanced UV- B dose in 57．8 W/cm2 after 5 leaf stage,Using a portable TPS- 2 photosynthetic analysis system， the photosynthetic rate (A)，stomatal conductance (G)，intercellular CO₂ concentration (Ci) and transpiration rate (E) were recorded after six days of treatment．Results indicated that in most of test material，the leaf A，G，and E were increased above 10% under UV- B treatment and their percentage in 48 lines were 64．6%，47．9% and 54．2%，respectively．However，leaf E in 62． 5% lines was reduced above 10% under UV- B treatment．There is significant correlation between the responses of G and E．The test inbreed lines was divided into six categories based on their performances to UV- B treatment．There were 12．5% inbreed lines with high sensitive and tolerance to enhanced UV- B radiation，respectively．It can be concluded that there is significant geno- type difference for the sensitivity of maize inbreed line to enhanced UV- B radiation and the materials with high sen- sitive or tolerance to enhanced UV- B radiation could be obtained．

Key words: Maize, Inbreed line, UV- B radiation, Gas exchange

中图分类号: 

• S513.01