摘要
利用水培法,采用浓度分别为0、0.1、5、10、25、50 mg/L As3+溶液对茶花凤仙和常夏石竹种子进行胁迫处理,研究不同浓度外源As3+对2种花卉种子萌发,幼苗生长的状况及抗氧化酶系统的影响。结果表明低浓度As3+(0.1 mg/L)对2种花卉种子萌发具有激活促进作用,高浓度As3+(50 mg/L)具有明显抑制效应;幼苗根长、芽长随着As3+浓度不断升高,生长受抑制。低浓度的As3+能够提高SOD、CAT的活性,随着浓度增大SOD、CAT表现为抑制效应;POD随着浓度增加激活效应逐渐增强。砷处理下,三种抗氧化酶均可被激活来抵抗砷的胁迫,其中过氧化物酶(POD)起关键作用。
The germination, seedling growth and antioxidant enzymes of two ornamental plants was studied under Arsenic stress. The results showed that As3＋ improved seed germination of two ornamental plants at low concentration and inhibited seed germination at high concentration. As3＋ inhibited growth of the root and the bud with the concentration increase. Activities of CAT and SOD were increased at low concentrations but inhibited when concentration of As3 ＋ increased . POD was stimulated by the raise of Arsenic concentrations. It could be concluded that POD plays an important role in the tolerance to arsenic stress among the three antioxidant enzymes.
出处
《山地农业生物学报》
2014年第2期10-13,22,共5页
Journal of Mountain Agriculture and Biology
基金
贵州省社发攻关项目[黔科合SY字(2013)3137]
关键词
砷
胁迫
花卉
种子萌发
幼苗生长
抗氧化酶
arsenic
stress
ornamental plant
seed germination
seedling growth
antioxidant enzyme
