Cd对超累积植物续断菊生长生理的影响

Effects of Cd on the Physiological Characteristics and Growth of the Sonchus asper L. Hill

通过水培试验,研究了不同Cd浓度(0、5、10、20 mg.L-1)对续断菊生长形态(株高、叶面积、根长)、生理指标(叶绿素、丙二醛、膜透性)及生物量的影响。结果表明:随着镉浓度的增加,续断菊的株高先增加后减小,根长先减小后增加,叶面积和生物量不断减小;低浓度的镉处理促进植物的生长,而20 mg.L-1镉处理30 d时植株的株高、叶面积、根长和生物量分别比对照降低了18%、46%、42%和66%;随着镉处理浓度的升高,续断菊叶片中叶绿素a、b、总叶绿素和胡萝卜素含量均下降,20 mg.L-1镉处理30 d时总叶绿素比对照降低了58%,丙二醛增加2.4倍,细胞膜透性增大2.3倍。

Solution culture was carried out to study the effects of cadmium on the growth （plant height,leaf area, root length and biomass） and physiological indicators （chlorophyll ,melondialodehyde （MDA）, membrane permeability） of Sonchus asper L. Hill. The result shows that： The biomass, plant height, leaf area and root length were increased with low Cd concentration treatment. The biomass, plant height, leaf area and root length decreased by 18% , 46% , 42% and 66% with 20 mg · L^-1 Cd treatment comparing with CK in 30 days, respectively. At the same time, contents of chlorophyll a and b, total chloropgyll and carotene decreased with increase of Cd concentration. Total chlorophyll decreased by 58% , MDA and membrane permeability increased 2.4 times and 2.3 times with 20 mg· L^- 1 Cd treatment comparing with CK in 30 days, respectively.