草业科学2017，Vol.34Issue(1)：84-93,10.DOI:10.11829/j.issn.1001-0629.2016-0117
镉胁迫对两种狼尾草不同生育时期生长性能、光合作用特征及镉吸收转运差异的影响
Effects of Cd concentrations on growth, photosynthetic indices and bioconcentration of two Pennisetum during different growth stages
摘要
Abstract
The growth,photosynthetic indices of Pennisetum americanum(ML) and P.americanum×P.purpureum(ZL) under different cadmium(0,5,25,50,75,100 mg·kg-1)were investigated by pot experiment and make a comparison between the two cadmium tolerance and the difference on the absorption and transport of cadmium.Results showed that: 1) the plant height decreased after increasing Cd concentration,fresh weight and dry weight decreased while leaf width changed no significant with the Cd concentration increased at the same growth stage;the indicators above increased gradually with the extension of the growth period at the same Cd concentration,however leaf width and fresh weight of ZL showed bigger;2) At the same growth stage,Chla and Chlb content in ML were more than ZL.When Cd concentration at 5 mg·kg-1,it showed little effects on the net photosynthetic rate,transpiration rate,intercellular carbon dioxide concentration,but with the Cd concentration increased each treatment became significantly decreased compared with the control(P<0.05),which indicated that high concentrations of Cd treatment had significant effect on the photosynthesis of Pennisetum especially ZL.3) Growth performance of American pennisetum was better than hybrid pennisetum,while the bioconcentration factor was less,indicating that the former had better tolerance to Cd,and the latter was more suitable for the remediation of cadmium contaminated soil.4) the root system is the main bioconcentration site and Cd in root part transfered little to the overground part,in three growth stages,the content of Cd was the highest in seedling stage,which showed the seedling stage was when the plant was the most susceptible to Cd stress.ZL had a better effect than ML on the remediation of cadmium contaminated soil.If the soil under low Cd concentrations(<1.0 mg·kg-1),pennisetum still can be used as edible forage.关键词
镉/狼尾草/生长性能/光合作用/富集系数Key words
Cadmium/Pennisetum/growth performance/photosynthesis/bioconcentration factor分类
农业科技引用本文复制引用
刘大林,孙启鑫,邵将,陈鸣晖,张华..镉胁迫对两种狼尾草不同生育时期生长性能、光合作用特征及镉吸收转运差异的影响[J].草业科学,2017,34(1):84-93,10.基金项目
江苏省草学重点学科建设基金(js2015010) （js2015010）
2014年江苏省普通高校研究生科研创新计划(CXLX_1430) （CXLX_1430）
