Cd^(2+)对狗牙根、假俭草种子萌发及幼苗生长的影响  

Effects of Cd^(2+) on the seed germination and seedling growth of Cynodon dactylon and Eremochloa ophiuroides

作　　者：岑画梦[1] 彭玲莉[1] 杨雪[1] 吴亚娇 廖源林 李西[1] 陈其兵[1] 蔡仕珍[1] 

机构地区：[1]四川农业大学风景园林学院,四川成都611730

出　　处：《草业学报》2015年第5期100-107,共8页Acta Prataculturae Sinica

基　　金：四川省教育厅重点项目(12ZA116)资助

摘　　要：探讨了Cd2+浓度对狗牙根与假俭草种子萌发和幼苗生长的影响。结果表明,两草种种子的发芽势、发芽率、发芽指数、活力指数、根长以及幼苗长度均随Cd2+浓度的升高而降低;叶片叶绿素含量随Cd2+浓度的升高略有降低;叶片丙二醛(MDA)含量随Cd2+浓度的升高呈先降后升趋势;狗牙根过氧化氢酶(CAT)活性随Cd2+浓度升高呈先升高后降低趋势,在5.0mg/L时显著高于CK,假俭草各处理浓度的CAT活性均低于CK;两草种的过氧化物酶(POD)活性随Cd2+浓度的升高呈先升高后降低趋势,并在10.0mg/L时达到峰值;Cd2+浓度在5.0,10.0,20.0,40.0mg/L时,狗牙根和假俭草多酚氧化酶(PPO)活性均高于CK,两草种PPO活性随Cd2+浓度的升高都呈先升高后降低趋势。两草种对Cd2+均有一定的耐受能力,狗牙根耐受能力大于假俭草,二者均可以应用于Cd2+轻度污染土壤。The effect of Cd2＋ concentration on the germination and growth of Cynodon dactylon and Eremochloa ophiuroides has been studied. The results showed that the seed germination rate, germination vigor, germina- tion index, vigor index, root length and seedling length of the two turfgrass species decreased with increases in Cd2＋ concentration. Chlorophyll content in leaves decreased slightly and the MDA contents in leaves showed a rising trend after an initial drop with increasing Cd2＋ concentration. The CAT activities of C. dactylon in- creased at first and then decreased with increasing concentrations. At a Cd2＋ concentration of 5.0 mg/I., CAT activities were significantly higher than that of CK, while the CAT activities of E. ophiuroides in all treat- ments were lower than that of CK. The POD activities of the two turfgrass species increased at first and then decreased with increasing Cd2＋ concentration, reaching its peak at 10.0 mg/L. The PPO activities of C. dac- tylon and E. ophiuroides were higher than CK when the concentrations were at 5. 0, 10.0, 20. 0 and 40.0 mg/L. With increasing Cd2＋ concentrations, the PPO activities of both species showed a declining trend follow-ing an initial rise. The two turfgrass species have a dactylon greater than that of E. ophiuroides. Both Cd2＋ pollution. certain degree tolerance turfgrass species can thus of Cd2＋ , be used with the tolerance of C. in soils with low levels of

关 键 词：Cd2+ 狗牙根 假俭草 种子萌发 幼苗生长 

分 类 号：S688.4[农业科学—观赏园艺]