2个杜仲无性系光合能力比较  

Photosynthetic capacity of two Eucommia ulmoides clones

作　　者：朱景乐[1,2] 杨超伟[1] 杜红岩[1,2] 李芳东[1,2] 孙志强[1,2] 杜兰英[1,2] 

机构地区：[1]中国林业科学研究院经济林研究开发中心,河南郑州450003 [2]国家林业局杜仲工程技术研究中心,河南郑州450003

出　　处：《浙江农林大学学报》2014年第5期704-709,共6页Journal of Zhejiang A&F University

基　　金："十二五"国家科技支撑计划项目(2012BAD21B0502);农业科技成果转化资金项目(2012GB24320591)

摘　　要：为了揭示杜仲Eucommia ulmoides不同无性系光合特性变异规律，以杜仲2个观赏型无性系的苗期叶片为材料，分别采用Li-6400和PAM2500测定其传统光响应曲线、快速光曲线及不同温度条件下的传统光响应曲线，通过直角双曲线模型计算其光合作用参数。结果表明：‘红叶’杜仲Eucommia elmoides‘Hongye’的光补偿点为23．960μmol．m^-1·s^-1，光饱和点为495．940μmol·m^-2·s^-1，最大净光合速率为16．907μmol·m^-2·s^-1，暗呼吸速率为1．666μmol．m^-2·S^-1，初始斜率为0．078；‘小叶’杜仲Eucommia elmoides‘Xiaoye’的光补偿点为26．487μmol·m^-2·s^-1，光饱和点为521．920μmol·m^-2·s^-1，最大净光合速率为18．502μmol·m^-2·s^-1，暗呼吸速率为1．674μmol·m^-2.s^-1，初始斜率为0．070；‘红叶’杜仲温度和各光合参数间存在显著的线性回归关系，回归方程的决定系数为0．479～0．959。杜仲2个无性系的光合作用参数表明，‘红叶’杜仲更适宜在中强光环境中生长，‘小叶’杜仲则在强光环境下生长状况优于‘红叶’杜仲。研究揭示的2个杜仲无性系的光合作用参数及变异规律为杜仲后期生理生化特性及生态适应性研究提供了依据。To provide a theoretical basis with Eucommia ulmoides for ecological adaptability and on breeding of new varieties, leaves of two ornamental E. ulmoides clone seedlings （‘ Hongye＇ and ‘Xiaoye＇ ） were se- lected and compared. For each clone, three leaves （i.e. three replicates） were selected and measured alterna- tively. Light response curves for both clones were measured using a Li-6400 and a rapid light curve found with a PAM2500. Light response curves under different temperatures for ‘Hongye＇ were measured too. Photosyn- thetic parameters were computed by rectangular hyperbola model. Equations of linear regression between pho- tosynthetic parameters and the temperatures were fitted. Results for ‘Hongye＇ leaves （inμmol.m^-2.s^-1） showed a light compensation point of 23.96, a light saturation point of 495.94, a maximum net photosynthetic rate of 16.907, and a respiration rate of 1.666; the initial slope was 0.078. ‘Xiaoye＇ leaves（in μmol.m^-2.s^-1） re- vealed a light compensation point of 26.487, a light saturation point of 521.920, a maximum net photosynthetic rate of 18.502, and a respiration rate of 1.674; the initial slope was 0.070. There were significant regression re- lationship between temperatures and photosynthetic parameters of ‘Hongye＇ （R2= 0.479-0.959）. These re-sults suggest that that E. ulmoides is a strong heliphilous species and temperature has significant effects on E. ulmoides photosynthetic parameters. [Ch, 4 fig. 2 tab. 13 ref. ]

关 键 词：经济林学 杜仲 无性系 光合作用 快速光曲线 温度 

分 类 号：S718.5[农业科学—林学]