YAN Zhi-ming,WEI Yue,JIA Si-zhen,et al.Effects of Salt Stress on Antioxidant System and Ion Uptake of Strawberry[J].Northern Horticulture,2013,37(09):1-4.
盐胁迫对草莓抗氧化系统和离子吸收的影响
- Title:
- Effects of Salt Stress on Antioxidant System and Ion Uptake of Strawberry
- 文章编号:
- 1001-0009(2013)09-0001-04
- Keywords:
- strawberry; salt stress; antioxidant system; ion uptake
- 分类号:
- S 668.4
- 文献标志码:
- A
- 摘要:
- 以“红颊”草莓为试材，采用营养液水培法，研究了盐胁迫对草莓叶片抗氧化系统和离子吸收的影响。结果表明：与对照相比，盐胁迫初期，草莓叶片内超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶(CAT)活性呈现先上升趋势，6 h达到最大，随后呈现下降趋势；同时草莓叶片超氧阴离子(O2-)产生速率加快；过氧化氢(H2O2)含量、丙二醛(MDA)含量和质膜透性均提高，且随胁迫时间延长，增加幅度变大。盐胁迫明显地提高了草莓根、茎和叶片中的Na+含量，降低了K+和Ca2+含量，说明盐胁迫抑制了K+和Ca2+的吸收；盐胁迫均降低了草莓根、茎和叶片中K+/Na+和Ca2+/Na+。综上结果表明，在盐胁迫初期，植物可通过提高其体内抗氧化酶活性来提高草莓抗性，随胁迫时间延长，植物体内抗氧化系统遭到破坏；同时，盐胁迫也抑制了草莓对矿质营养离子的吸收，破坏了植物体内离子平衡。
- Abstract:
- Taking ‘Hongjia’ strawberry as materials，the effects of salt stress on antioxidant system and ion uptake of strawberry were investigated under salt stress using nutrient solution hydroponics.The results showed that SOD，POD and CAT activities in leaves of strawberry first showed increasing trend，these enzymes arrived maximum at 6 h，and then showed a downward trend；at the same time，O2-generation rate，H2O2 content，MDA content and membrane permeability all accelerated，and with stress prolonging increased larger.Salt stress significantly improved Na+?content，decreased K+?and Ca2+?contents in roots，stems and leaves of strawberry，these suggested that salt stress inhibited the K+?and Ca2+?absorption；salt stress decreased K+/Na+?and Ca2+/Na+?in roots，stems and leaves of strawberry.These results indicated that at early stress，plants improved its resistance by increasing antioxidant enzyme activities，but the antioxidant system was destroyed with stress prolonging.Salt stress also inhibited absorption of mineral ions of strawberry，and destroyed the ion balance in plants.
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备注/Memo
第一作者简介：颜志明（1977-），男，江苏滨海人，博士，讲师，现主要从事设施蔬菜栽培生理等研究工作。E-mail：yanzming@sohu.com.