植物次生代谢响应UV-B辐射胁迫的生态学意义

Ecological significance of enhanced UV-B radiation in secondary metabolism

平流层臭氧的减薄已导致地表中波紫外辐射(UV-B,280～320nm)增强,使植物体内的次生代谢发生改变,而次生代谢产物与抗紫外辐射、抑制昆虫、防止病菌感染和其他食草动物取食、凋落物分解、他感作用等方面存在复杂联系,进而影响生态系统的种类组成、种间关系以及生物的多样性,并导致生态系统的生产力、物质循环、地球化学循环和能量流动等功能的改变,从而影响生态系统的平衡。本文综述了UV-B辐射增强对植物群落和生态系统的影响以及对次生代谢物影响的生态学意义,并展望了该领域的研究方向。

Stratospheric ozone depletion increases solar UV-B radiation （280-320 nm） reaching the earth surface, significantly affecting secondary metabolism in plants. The relationship between secondary metabolite and anti-ultraviolet radiation, insect inhibition, fungal infection prevention and herbivore feeding, litter decomposition and allelopathy is a complicated phenomenon. This rela- tionship affects species composition, inter-species relationship, biodiversity and productivity change, material circulation, geochemical cycle, energy flow isokinetic and ecological balance of the eco-system. The effect of enhanced UV-B radiation on phytocoenosis and ecological systems are summarized in the study, the specific emphasis is played on the ecological significance of enhanced UV-B radiation on secondary metabolism. Furthermore, the study establishes the trend of future research and development in managing UV-B radiation emission.