臭氧胁迫对树木根系影响研究进展

对流层中高浓度的臭氧是一种严重危害植物的大气污染物,臭氧浓度的升高会对农作物、林木等产生一系列的损害。根系是树木生存的基本要素,臭氧对根结构的根本性改变会最终影响根功能,从而影响树木的整体健康以及对环境胁迫的抗性,通过综述臭氧胁迫对森林树木根系影响的研究进展,可以为我国学者进一步了解臭氧对森林树木根系生态影响提供科学素材。有关大气臭氧浓度升高对森林树木根系生态的影响,目前研究主要包括森林树木根系生长、细根动态和周转、根系呼吸、根系碳水化合物、菌根、根际微生物的响应变化等几个方面。臭氧对树木根系的影响与臭氧浓度、树种、树龄、群落组成及种植条件相关。目前有关臭氧胁迫对树木根系的机制研究还比较缺乏,今后应该加强臭氧胁迫下根系形态构型的原位观察测定和定量分析研究,内源激素响应,胁迫信号感受、转导与其它信号途径的互作关系以及分子生物学机制方面的研究。

Effects of Ozone Stress on Tree Root: A Review

Elevated ozone will cause substantial changes of root architecture that may ultimately affect the function of root and thereby the tree''s overall health and ability to cope with stress. The effects of elevated ozone on the root of trees included root growth, fine root dynamics and turnover, root respiration, carbohydrates in roots, mycorrhiza growth and rhizosphere soil microbiology. The effects of ozone stress on tree root are relevant to the concentration of ozone, species, tree age, community composition and planting conditions. At present, there is limited information about the mechanism of the effects of ozone on root. It is necessary in the future to strengthen the in-situ observation and quantitative analysis of root architecture, response of endogenous hormone to ozone, stress signal sensing, transduction and interaction with other signaling pathway, and the molecular biological mechanisms of roots response to ozone.