增强UV-B辐射和CO_2复合作用对蚕豆幼苗生长和光合作用的影响  

The combined effects of enhanced UV-B radiation and CO_2 on the growth and photosynthesis of broad bean seedling

作　　者：赵广琦[1] 王勋陵[1] 岳明[1] 李方民[1] 

机构地区：[1]西北大学生命科学学院,西安710069

出　　处：《西北植物学报》2003年第1期6-10,共5页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金项目(39970126);陕西省科技厅产业化培育项目(01ZC07)

摘　　要：在4.52kJ·m-2·d-1UV-BBE的UV-B辐射和700μmol·mol-1的CO2浓度人工模拟复合处理下,研究了对蚕豆(ViciafabaL.)幼苗的生长和光合作用的影响。结果表明,UV-B辐射单因子明显降低蚕豆幼苗的株高、叶面积和生物量,CO2单因子的作用正好相反,二者的作用程度随着处理时间的延长而增大。UV-B辐射和CO2复合作用对蚕豆幼苗的生长影响不明显。同时,增强的UV-B辐射单因子还使蚕豆幼苗的光合速率、气孔导度和水分利用率下降,CO2单因子的作用也相反,且CO2单因子的促进程度大于UV-B辐射单因子的抑制程度。而在UV-B辐射和CO2复合作用下,蚕豆幼苗的光合作用参数基本与对照同步。分析认为,UV-B辐射和CO2复合作用对蚕豆幼苗的影响是一种拮抗作用。Broad bean (Vicia faba L.) seedlings were investigated on their growth and photosynthesis responses to simulating 4.52 kJ·m-2·d-1UVBBE of ultravioletB(UVB,280~320 nm) and 700 μmol·mol-1 CO2 concentration.The results showed that enhanced UVB radiation significantly decreased the plant height,leaf area and total biomass.Increasing CO2 concentration was opposite to that.The action of UVB/CO2 on plants grew with the treatment time.The combined effect of enhanced UVB and high CO2 on the growth of broad bean seedling was far less.On the other hand,enhanced UVB radiation also decreased the photosynthetic rate,stomata conductance and water use efficiency of plants.High CO2 turned out contrary to them.The promotion of CO2 on the plants was bigger than the inhibition of UVB on that.And the photosynthetic parameters of the plants growing under enhanced UVB and high CO2 were the same with the control for the most part.The present work shows that the combined effect of enhanced UVB and high CO2 on broad bean seedling is a kind of match action.

关 键 词：增强UV-B辐射 CO2复合作用 蚕豆 幼苗生长 光合作用 

分 类 号：Q948.116[生物学—植物学]