Abstract:

Effects of enhanced ultraviolet-B (UV-B) radiation on growth, yield and stable carbon isotope composition (δ13C value) in ten cultivars of Glycine max (L.) Merr. were investigated under field conditions. Supplemental UV-B irradiation simulated a 20% stratospheric ozone depletion in Lanzhou on summer solstice day. UV-B radiation reduced biomass and yield in all soybean cultivars by 24.2% and 23.3%, respectively. However, the harvest index increased in 6 of ten soybean cultivars but reduced in 4 cultivars, the average increment was 1.39%. As compared with control, the decrease in δ13C value by UV-B was observed in most cultivars, except in cutlivar “8907-32” increase was found. There were also organ differences of stable carbon isotope composition under enhanced UV-B irradiation. δ13C of roots was the highest and of leaves was the lowest, δ13C value in stem was higher than in seeds. The results indicated that UV-B enhancement might change the metabolic process and the allocation of metabolite.

UV-B辐射对大豆生长、产量和稳定碳同位素组成的影响
冯虎元^1,2  陈拓²  徐世健¹ 安黎哲^1,2 强维亚¹ 张满效¹ 王勋陵^1*

（1. 兰州大学生命科学学院干旱农业生态国家重点实验室，兰州730000；2.中国科学院寒区旱区环境与工程研究所，兰州730000）

关键词： 紫外线( 辐射；生长；产量；稳定碳同位素；大豆

Key words: UV-B radiation, growth, yield, δ13C value, Glycine max