铝胁迫对黄芩幼苗气孔特性及光合作用的研究  

Effects of Aluminum Stress on the Stomatal Characteristics and Photosynthesis of Scutellaria baicalensis Georgi Seedlings

作　　者：李亚敏[1] 刘建中[1] 史永博[1] 张峰[1] 

机构地区：[1]陕西广播电视大学理工部,陕西西安710069

出　　处：《安徽农业科学》2011年第10期5791-5793,共3页Journal of Anhui Agricultural Sciences

摘　　要：[目的]探讨铝胁迫对黄芩幼苗气孔特性与光合作用的影响,以期为揭示铝毒害植物机理提供理论依据。[方法]以黄芩为研究材料,采用盆栽方式,待幼苗长至6片真叶时,用0.1、0.5、2.0和5.0 mmol/L的铝溶液处理黄芩幼苗,30 d后进行各项指标测定。[结果]铝胁迫导致黄芩气孔长度、气孔宽度及气孔面积减小,但气孔密度增加;随着铝胁迫浓度的增大,黄芩叶片光合速率、蒸腾速率以及气孔导度显著减低,但胞间CO2浓度显著升高,从而严重抑制了植物叶片光合作用的正常进行。[结论]铝胁迫导致黄芩光合作用受到抑制是由于非气孔因素造成的,高浓度铝胁迫下黄芩对环境的适应性受到破坏。[Objective]To discuss the effects of aluminum stress on the stomatal characteristics and photosynthesis of Scutellaria baicalensis Georgi seedlings,so as to provide a theoretical basis for revealing the aluminum toxicity mechanism on plants.[Method] Scutellaria baicalensis Georgi seedlings at 6 true-leaf stage were treated with different concentrations of aluminum at 0.1,0.5,2.0 and 5.0 m mol/L.After 30 days,the leaves were harvested for determining stomatal characters including area and density,and photosynthesis indexes such as net photosynthetic rate,transpiration rate and stomatal conductance.[Results] Aluminum stress could lead to significantly reduce the stomatal length,stomatal width and stomatal area,but stomatal density was improved.The net photosynthetic rate,transpiration rate and stomatal conductance decreased significantly with the increase in aluminum concentration,but the intercellular CO2 concentration was significantly increased.[Conclusions] It was non-stomatal factors which leaded to the restraint of photosynthesis;meanwhile high-concentration aluminum might result in the bad effects on the adaptability of Scutellaria baicalensis Georgi to environment.

关 键 词：黄芩(Scutellaria baicalensis Georgi) 幼苗 铝 气孔特性 光合作用 

分 类 号：S567.2[农业科学—中草药栽培]