【摘要】 为探明柳枝稷（Panicum virgatum L.）在镉（Cd）胁迫下的生理变化与耐性,选取柳枝稷低地型品种Alamo以改良Hoagland营养液培养,用CdCl₂ 0μmol/L（CK）、5μmol/L、10μmol/L、20μmol/L和30μmol/L胁迫2周后收苗,测定柳枝稷株高、根长、含水量、生物量和叶绿素含量,并进行相关性分析。结果表明:随Cd浓度增加柳枝稷植株的增高、根系伸长及根含水量呈下降趋势;与CK相比,当Cd浓度在10μmol/L及其以上时,根系伸长和根含水量显著（P<0.05）下降;Cd浓度在20μmol/L及其以上时,植株增高显著降低;生物量、茎叶含水量与叶绿素a、叶绿素b和总叶绿素含量各处理间差异不显著（P>0.05）;Cd浓度与柳枝稷植株的增高、根系伸长、根含水量、茎叶含水量呈显著或极显著负相关,与生物量呈正相关但不显著。Alamo对Cd胁迫具有一定的耐性。更多还原

【Abstract】 In order to study the physiological variation and tolerance of switchgrass under Cd stress,a culture experiment was conducted with the low-lying switchgrass cultivar Alamo and Hoagland nutrient solution,different concentrations of CdCl₂（0μmol/L,5μmol/L,10μmol/L,20μmol/L,30μmol/L）were added to explore the effects of Cd stress on plant height,root length,moisture content,biomass and chlorophyll content,then the correlations were analyzed as well.Results:The plant height increasing,root extending and moisture content decreased with Cd concentration increasing;Root extending and moisture content significantly decreased when Cd concentration exceeding 10μmol/L;compared with CK,Plant height increasing significantly decreased when Cd concentration was above 10μmol/L;Biomass and moisture content in stem and leaf had no significant correlation with contents of chlorophyll a,chlorophyll b and total chlorophyll;Cd concentration significantly or even highly significantly negatively correlated with plant height increasing,root extending,root moisture content,moisture content in stem and leaf,and non-significantly positively correlated with biomass.Alamo has a certain degree of tolerance to Cd stress.更多还原