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Position: Home > Articles > Studies on Responses of Carex dispalatato Cd Stress and Its Accumulation Ability Chinese Journal of Grassland 2012,34 (2) 16-22

弯囊苔草对Cd胁迫的响应及其Cd富集能力的研究

作  者:
程龙玲;周守标;吴晓艳;夏青;王欣;吴琪
单  位:
安徽师范大学生命科学学院/安徽重要生物资源保护与利用研究重点实验室
关键词:
Cd2+胁迫;弯囊苔草;生长和生理特性;富集能力
摘  要:
通过水培实验,研究了不同Cd2+浓度(0、50μmol/L、100μmol/L、200μmol/L、400μmol/L)下和不同时间内(1d、4d、7d、10d)Cd2+对弯囊苔草生长、生理指标及富集能力的影响。结果表明:(1)株高、最长根长、新增根数、新分蘖数、鲜重和地上与地下部分的干重比均随着Cd2+浓度的提高而逐渐下降。(2)3种抗氧化酶活性均随着Cd2+浓度的增加呈现先上升后下降的趋势。(3)MDA含量、Pro含量和质膜透性均随着Cd2+胁迫浓度的增加和胁迫时间的延长而增加。(4)叶绿素含量在低浓度Cd2+胁迫时增加,高浓度和胁迫时间长时下降。(5)弯囊苔草体内Cd含量随Cd2+浓度的增大而增加,根系对Cd的富集能力明显高于地上部分。根系对Cd的平均滞留率为93.21%,弯囊苔草对Cd的转移系数小于1,表明弯囊苔草根系对Cd有较强的滞留作用和富集能力。
译  名:
Studies on Responses of Carex dispalatato Cd Stress and Its Accumulation Ability
作  者:
CHENG Long-ling,ZHOU Shou-biao,WU Xiao-yan,XIA Qing,WANG Xin,WU Qi(Key Lab.of Biological Resources Conservation and Utilization,College of Life Science, Anhui Normal University,Wuhu 241000,China)
关键词:
Cd2+ stress;Carex dispalata;Growth and physiological characteristics;Accumulation ability
摘  要:
The effects of Cd2+ on growth characteristics,physiological indices and Cd accumulation ability of Carex dispalata were studied with water culture method.The results showed that:(1) The plant height,length of longest root,number of new root and new tillers,fresh weight and the ratio of shoot to root dry weight were significantly reduced with increasing Cd2+ level.(2) The activities of antioxidant enzymes increased at beginning,and then decreased with increase of Cd2+ concentrations.(3) MDA content,proline content and cell membrane permeability increased with increase of Cd level and time.(4) Chlorophyll content increased under lower Cd2+ concentration,but decreased gradually under higher Cd2+ concentration and longer stress time.(5)The Cd content in Carex dispalata increased with the increase of Cd2+ concentration,and the Cd accumulation ability of root was distinctly higher than that of the above-ground part.The Cd average retention rate in root of Carex dispalata was 93.21% and the biological transfer coefficient to Cd was less than one,which indicated that the root of Carex dispalata has stronger retention action and accumulation ability on Cd.

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