镉胁迫对高羊茅和匍匐翦股颖抗逆生理特性的影响

Effects of cadmium stress on physiological characteristics of resilience in Festuca arundinacea L.and Agrostis stolonifera L.

以高羊茅(Festuca arundinacea L.)品种‘法恩’和匍匐翦股颖(Agrostis stolonifera L.)品种‘老虎’为材料,通过盆栽实验法,采用不同浓度的镉(Cd)溶液(0、150、300 mmol/L)对其进行胁迫处理,研究不同浓度Cd胁迫对两种植物生长、光合、丙二醛(MDA)含量和抗氧化酶活性等抗逆生理指标的影响。结果显示,Cd胁迫下高羊茅和匍匐翦股颖冠层的高度、叶绿素含量、最大光化学量子产量(F_(v)/F_(m))显著低于对照,MDA含量、可溶性蛋白含量、过氧化氢酶(CAT)和超氧化物歧化酶(SOD)活性均显著高于对照,且随Cd^(2+)浓度的增加而增加。通过Cd毒害系数计算后发现,300 mmol/L浓度的Cd胁迫对高羊茅生长、光合、MDA含量及抗氧化酶活性的毒害系数显著低于匍匐翦股颖,表明高羊茅耐Cd能力高于匍匐翦股颖。

Festuca arundinacea L.and Agrostis stolonifera L.are two kinds of high-quality turfgrass.In this study,different concentrations of cadmium(Cd)solution(0,150,300 mmol/L)were used to test the effects of Cd on growth rate,photosynthesis efficiency,malondialdehyde(MDA)content,and antioxidant enzyme activities in one-month-old F.arundinacea L.‘Fana’and A.stolonifera L.‘Tiger’.Results showed that under Cd stress,canopy height,chlorophyll content,and chlorophyll fluorescence were significantly lower in F.arundinacea and A.stolonifera than in the control.However,MDA content,soluble protein content,and catalase(CAT)and superoxide dismutase(SOD)activity in the leaves of F.arundinacea and A.stolonifera were significantly higher than those in the control under Cd stress and increased with the increase in Cd concentration.After calculating the Cd toxicity coefficient with reference to the salinity coefficient of plants,the toxicity coefficients of 300 mmol/L Cd stress on growth,photosynthesis,MDA content,and antioxidant enzyme activities were significantly lower in F.arundinacea than in A.stolonifera,indicating that Cd tolerance was higher in F.arundinacea than in A.stolonifera.These results provide a theoretical basis for the selection of resistant turfgrass species.