草业学报2011，Vol.20Issue(6)：60-67,8.
镉胁迫下两种菊芋幼苗的光合作用特征及镉吸收转运差异的研究
Effect on the photosynthetic characteristics of Cd uptake and translocation in seedlings of two Helianthus tuberosus varieties
摘要
Abstract
The photosynthetic characteristics and Cd accumulating capacities of two Helianthus tuberosus varieties (NY5, NY2) at different Cd concentrations (0, 5, 25, 50, 100, and 200 mg/L) , were investigated for the potential use of H. Tuberosus as a candidate for phytoremediation of Cd-contaminated soils. 1) The biomass of NY5 and NY2 were significantly reduced by Cd stress, but the reduction was less for NY5 than for NY2. 2) The chlorophyll content of NY5 was lowest in the 100 mg/L Cd treatment, while for NY2, the lowest value was observed in the 25 mg/L Cd treatment. The carotenoids content of NY5 under Cd stress was higher than that of the control, while the opposite was observed for NY2. 3) With the increase in Cd concentration, net photosynthetic rate (Pn) , stomatal conductance (Gs) and transpiration rate (Tr) significantly decreased, but the intercellular CO2 concentration (Ci) was relatively stable. Water use efficiency (WUE) and stomatal limitation (Ls) of NY5 showed similar change trend under Cd stress with the lowest value observed at 50 mg/L Cd, while for NY2, there was little change. 4) NY5 and NY2 had Cd tolerance and accumulation capacity at high concentrations of Cd stress, but the capacity of NY5 was greater than that of NY2. H. Tuberosus may therefore be an excellent candidate for phytoremediation on Cd-contaminated soils, and NY5 may be better than NY2.关键词
镉胁迫/菊芋/光合特征/镉吸收转运Key words
Cd stress/ Helianthus tuberosus/ photosynthetic characteristics/ Cd uptake and translocation分类
农业科技引用本文复制引用
陈良,隆小华,郑晓涛,刘兆普..镉胁迫下两种菊芋幼苗的光合作用特征及镉吸收转运差异的研究[J].草业学报,2011,20(6):60-67,8.基金项目
公益性行业(农业)科研专项经费项目(200903001-05),国家"948"项目(2009-z9),国家重大支撑项目(2011BAD13B09),江苏省科技支撑项目(BE2011368和BE2010305),教育部博士点基金(20100097120016)和中央高校基本业务费项目(Y0201100249)资助. （农业）
