RESPONSES IN NITROGEN MASS AND NITROGEN METABOLISM OF WILD SUGARCANE (SACCHARUM SPONTANEUM L.) CLONES TO ENHANCED UV-B RADIATION UNDER FIELD CONDITIONS | Science Publications

American Journal of Environmental Sciences

Yanqun Zu¹  Yongmei He¹  Haiyun Wang¹  Yuan Li¹ 

关键词: Saccharum spontaneum L.;    UV-B Radiation;    N Mass;    Nitrate Reductase;    Glutamine Synthetase;    Intraspecific Responses;   

DOI  :  10.3844/ajessp.2013.446.457

学科分类：环境科学（综合）

来源: Science Publications

【 摘 要 】

Field experiments were conducted to evaluate effects of enhanced UV-B radiation (280-315 nm) on intraspecific responses in nitrogen mass and nitrogen metabolism of six wild sugarcane (Saccharum spontaneum L.) clones. The clones were collected from original sites with different altitudes (4-1780 m above sea-level) and latitudes (18-38°N). The supplemental UV-B radiation was 5.00 kJ•m^-2, simulating a depletion of 20% stratospheric ozone. Out of the six tested wild sugarcane clones, available Nitrogen (N) contents in soil and N contents in leaves of four wild sugarcane clones decreased significantly. Leaf biomass and leaf N mass of six wild sugarcane clones significantly increased. UV-B radiation significantly decreased N contents and increased biomass and N mass in stems of six wild sugarcane clones. Contents of free amino acid of two wild sugarcane clones (92-11 and 92-36) significantly decreased, whilst that of clones 83-193 and II91-5 significantly increased. Total protein contents of three wild sugarcane clones significantly decreased, whilst that of clone 90-15 significantly increased. Nitrate reductase activities of two clones (92-11 and 90-15) significantly decreased, whilst that of four clones significantly increased. Glutamine synthetase activities of two clones (92-11 and 90-15) significantly increased, while that of clones 83-193 significantly decreased. UV-B radiation might change stem biomass, resulting in changes in N mass in stem and leaves. Results indicate that intraspecific responses in N mass and N metabolism of six wild sugarcane (S. spontaneum) clones differing in UV sensitivity to enhanced UV-B radiation exist under field conditions.

【 授权许可】

Unknown