文档介绍：华北农学报· 2 0 1 0 ,2 5 ( 4 ) : 1 6 2 -1 6 5
镉胁迫对银条生物量及光合特性的影响
刘会超,刘孟刚,姚连芳,贾文庆
( 河南科技学院园林学院,河南新乡
453003 )
摘要: 通过盆栽试验,研究了 CdCl2 胁迫对银条叶片光合特性的影响。结果表明,随着 CdCl2 浓度的增加,银条生
物量下降明显,叶片光合速率( Pn ) 、蒸腾速率( Tr ) 和气孔导度( Gs ) 降低,在镉浓度为 250 mg / L 时分别为对照的
25 . 00% ,35 . 52% ,54 . 02% ; 水分利用效率( WUE) 呈现先升高再降低的变化趋势,而胞间 CO 2 浓度( Ci ) 只在高浓度
( ≥200 mg / L) 时才逐步升高,但增幅相对较小,在 2 . 40% ~ 9 . 15% 之间。
关键词: 银条; 镉胁迫; 光合特性
中图分类号: S63
文献标识码: A
文章编号: 1000 - 7091 ( 2010 ) 04 - 0162 - 04
Effects of Cadmium Stress on Biomass and Photosynthetic
Characteristics of Stachys floridana
LIU Hui-chao,LIU Meng-gang,YAO Lian-fang,JIA Wen-qing
( School of Horticulture Landscape Architecture,Henan Institute of Science and
Technology,Xinxiang
453003,China)
Abstract: With pot cultivation,the effects of cadmium stress on the leaf photosynthetic characteristics of Stachys
Floridana were studied. The results showed that with the increasing of cadmium concentration,the biomass of Stachys
Floridana decreased significantly . Cadmium reduced the photosynthetic rate( Pn) ,transpiration rate( Tr) and stomatal
conductance( Gs) to 25. 00% ,35. 52% ,54. 02% respectively at a concentration of 250 mg / L. The water use efficiency
( WUE) was firstly increased,and then decreased. The intercellular CO 2 concentration ( Ci ) was gradually escalate
with the higher cadmium concentration ( greater than or equal to 200 mg / L