外源硫对镉胁迫下不同耐镉性野菊光合特性的影响  

Effects of Exogenous Sulfur on Photosynthetic Characteristics of Chrysanthemum indicum With Different Cadmium Tolerance Under Cadmium Stress

作　　者：宗子煖 倪星雨 陈楚怡 岳莉然[1] ZONG Zixuan;NI Xingyu;CHEN Chuyi;YUE Liran(College of Landscape Architecture,Northeast Forestry University,Harbin,Heilongjiang 150040)

机构地区：[1]东北林业大学园林学院,黑龙江哈尔滨150040

出　　处：《北方园艺》2023年第14期56-62,共7页Northern Horticulture

基　　金：中央高校基本科研业务费专项资金资助项目(2572014BA22)。

摘　　要：以不同耐镉性野菊株系为试材,采用水培法,研究不同浓度(S0:2.70μmol·L^(-1)、S1:1502.70μmol·L^(-1)、S2:6502.70μmol·L^(-1))的外源硫对镉胁迫处理下野菊叶绿素含量和光合参数的影响,以期探究外源硫对野菊镉毒害的缓解作用。结果表明:有镉(100μmol·L^(-1))足量硫(S1+Cd)与无镉(0μmol·L^(-1))足量硫(S1-Cd)处理相比,6个不同耐镉性野菊株系叶片的叶绿素含量和净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)均显著降低,胞间二氧化碳浓度(Ci)显著升高。镉胁迫下随着硫处理浓度的增加,6个株系中叶片的叶绿素含量、Pn、Gs和Tr均有一定程度的升高,Ci显著下降。说明外源硫的介入可以引起镉胁迫下各株系光合指标、叶绿素含量的变化,从而缓解镉毒性对野菊光合作用的不良影响,其中加入过量硫(S2)时缓解效果最为显著。此外,高耐镉性株系的叶绿素含量、Pn、Gs、Tr和Ci的变化程度小于中、低耐镉性株系,说明野菊本身的耐镉性越弱,硫对缓解其光合特性的镉毒害程度越明显。The effects of different concentrations of exogenous sulfur(SO,2.70μmol·L^(-1);Sl,1502.70μmol·L^(-1);S2,6502.70μmol.L^(-1))on chlorophyll content and photosynthetic parameters of Chrysanthemum indicum under cadmium stress were investigated by using different cadmiumtolerant strains as test materials and hydroponics,in order to explore the mitigating effects of exogenous sulfur on cadmium toxicity in C.indicum.The results showed that the chlorophyll content and net photosynthetic rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)of six different cadmium-tolerant C.indicum strains were significantly reduced in the presence of Cd(100μmol·L^(-1))sufficient sulfur(S1+Cd)compared with the treatment without Cd(Oμmol·L^(-1))sufficient sulfur(Sl-Cd),and intercellular carbon dioxide concentration(Ci)was significantly higher.The chlorophyll content,Pn,Gs and Tr of leaves in the six strains increased to some extent with the increase of sulfur treatment concentration under Cd stress,and Ci decreased significantly.It indicated that the intervention of exogenous sulfur could cause changes in photosynthetic index and chlorophyll content of each strain under cadmium stress,thus alleviating the adverse effects of cadmium toxicity on photosynthesis of C.indicum,with the most significant alleviation effect when excess sulfur(S2)was added.In addition,the chlorophyll content,Pn,Gs and Tr and Ci of the high Cd-tolerant strains varied to a lesser extent than those of the medium and low Cd-tolerant strains,indicated that the weaker the Cd tolerance of C.indicum itself,the more pronounced the degree of Cd toxicity of sulfur in alleviating its photosynthetic properties.

关 键 词：野菊 外源硫 镉毒害 光合特性 

分 类 号：S682.11[农业科学—观赏园艺]