摘要
在大田栽培和自然光条件下,研究了连续3年模拟紫外辐射(UV-B,280~315nm)增加对33个割手密无性系成熟期锤度的影响。结果表明:(1)UV-B辐射对割手密无性系锤度具有明显的影响;(2)33个割手密无性系锤度对UV-B辐射响应具有明显的差异,在2003年、2004年和2005年,锤度响应范围分别为-27.86%~69.90%、-28.88%~34.58%和-18.90%~26.21%;(3)割手密无性系锤度对UV-B辐射响应具有明显的年际间差异,从选择的10个无性系来看,从2003年、2004年到2005年,6个无性系锤度变化率增加,4个无性系锤度变化率下降。
Field studies were conducted for three consecutive years to determine the potential effect of enhanced ultraviolet-B (UV-B, 280- 315 nm) radiation on birxs (the total solvable material contents in cell) and the intraspecific variation of birxs of 33 wild sugarcane (Saccharum spontaneum L.) clones at ripening stage. Wild sugarcane clones were collected from original sites in China. The supplemental UV-B radiation was 5.00 kJ· m^-2, simulating a depletion of 20% stratospheric ozone at Kunming (25°N, 1950 m). Out of 33 wild sugarcane clones tested, in general, ultraviolet-B radiation had significant effects on brixs, while intraspecific differences in brixs of wild sugarcane clones under UV-B radiation were observed in 2003, 2004 and 2005, respectively. The responses of birxs to UV-B radiation varied with different years, being -27.86%-69.90%, -28.88%-34.58% and -18.90%-26.21% in 2003, 2004 and 2005, respectively. Considering 10 wild sugarcane clones that were chosen from 33 tested clones in 2003, 2004 and 2005, respectively, the birxs of 6 of them increased, and that of 4 of them decreased under UV-B radiation. Brixes were related with sensitivity of wild sugarcane clones to UV-B radiation. UV-B radiation decreased brixs in tolerant wild sugarcane clones that originated from regions with high UV-B ambient (high elevation), but increased that in sensitivity ones that originated from regions with low UV-B ambient (high elevation).
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第3期1014-1018,共5页
Journal of Agro-Environment Science
基金
国家自然科学基金资助项目(30260026)
关键词
UV-B辐射
割手密
锤度
响应差异
UV-B radiation
wild sugarcane (Saccharum spontaneum L.)
birxs
response difference