盐胁迫下3个楸树无性系光合特征研究  

Studies on Photosynthetic Characteristics of Three Clones of Catalpa bungei under Various Salt Stress

作　　者：王臣[1] 虞木奎[1] 张翠[1] 吴统贵[1] 袁健军[1] 周成云 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400 [2]浙江省富阳市林业局,浙江富阳311400

出　　处：《林业科学研究》2010年第4期537-543,共7页Forest Research

基　　金："十一五"国家科技支撑计划项目(2006BAD24B08);(2006BAD03A1603)

摘　　要：以3个楸树无性系为材料进行盐胁迫试验,分析了叶片叶绿素含量、净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)等指标的变化规律。结果表明:随盐浓度增加,所有无性系的叶绿素a、叶绿素b及总叶绿素含量呈下降趋势;方差分析表明:处理间及无性系间差异显著(P<0.05)。叶绿素a/叶绿素b值呈上升趋势,YQ1无性系各盐处理与CK差异不显著,02-2-5和07-1无性系各盐处理与CK存在一定差异。从光合日变化看,3个无性系的Pn随盐浓度的升高明显降低,降幅为07-1>YQ1>02-2-5,净光合速率最大值(Pmax)都出现在8:00时,无性系间差异显著,且02-2-5>YQ1>07-1。回归分析和通径分析表明:02-2-5和YQ1无性系主要受胞间CO2浓度(Ci)、叶温(Tl)、光合有效辐射(PAR)的影响,07-1无性系主要受Gs和Ci的影响。初步认为3个无性系的耐盐能力为02-2-5>YQ1>07-1。The leaf chlorophyll contents,the daily dynamic of net photosynthetic rate（Pn）,stomatal conductance（Gs）,intercellular CO2 concentration（Ci） and major affecting factors were determined of three clones of Catalpa bungei under salt stress.The results showed that Chla,Chlb and Chlt contents decreased under salt stress and significant differences were found of Chla,Chlb and Chlt among 3 clones of C.bungei.The ratios of Chla/Chlb increased with the increasing of salt concentration,and significant differences were found in different treatments of 02-2-5 and 07-1.The maximum of Pn（Pmax） appeared at 8：00 in all treatments of 3 clones,with the sequence of 02-2-5YQ107-1,and significant differences were found in 3 clones.Pn was also decreased with the increasing of salt concentration,and the sequence of decrement was 07-1YQ102-2-5.Stepwise multiple-regression and path coefficient analysis indicated that the major affecting factor of Pn were Ci,leaf temperature（Tl） and photosynthetic active radiation（PAR） in clones of 02-2-5 and YQ1,but Gs and Ci in 07-1.Based on the variations of leaf chlorophyll contents and Pn among 3 clones under salt stress,02-2-5 had the highest salt tolerance,followed by YQ1,and 07-1.

关 键 词：楸树 无性系 盐胁迫 叶绿素含量 净光合速率 回归分析 通径分析 

分 类 号：S723.1[农业科学—林木遗传育种]