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草业学报 ›› 2017, Vol. 26 ›› Issue (12): 89-97.DOI: 10.11686/cyxb2017268

• 研究论文 • 上一篇    下一篇

四个燕麦品种对锶耐受性的比较研究

亓琳1, *, 杨莹博2, 王晓凌1, 赵威1   

  1. 1.河南科技大学农学院,河南 洛阳 471023;
    2.兰州大学生命科学学院, 草地农业生态系统国家重点实验室,甘肃 兰州 730000
  • 收稿日期:2017-06-06 修回日期:2017-07-27 出版日期:2017-12-20 发布日期:2017-12-20
  • 通讯作者: E-mail:qilinchampion@126.com
  • 作者简介:亓琳(1985-),女,河南洛阳人,讲师,博士。
  • 基金资助:
    河南科技大学青年基金项目(2014QN065),河南科技大学学科提升振兴A计划项目(13660001)和国家自然科学基金(U1304326)资助

Comparative studies on strontium tolerance of four Avena sativa varieties

QI Lin1, *, YANG Ying-Bo2, WANG Xiao-Ling1, ZHAO Wei1   

  1. 1.Agricultural College, Henan University of Science and Technology, Luoyang 471023, China;
    2.School of Life Sciences, Lanzhou University, State Key Laboratory of Grassland Agro-ecosystem, Lanzhou 730000, China
  • Received:2017-06-06 Revised:2017-07-27 Online:2017-12-20 Published:2017-12-20
  • Contact: E-mail:qilinchampion@126.com

摘要: 为探明燕麦对锶的富集能力和耐受机制,选取了4个燕麦品种(本德、白燕2号、白燕7号和定莜6号),施加不同浓度锶(0、25、100、500和1000 mg/kg)处理30 d,分析燕麦对锶的富集和分配特征、生长指标、丙二醛(MDA)含量以及超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性。结果显示:1)燕麦幼苗的根部和地上生物量都随着土壤中锶浓度的升高呈先增加后降低的趋势;2)各器官的富集浓度随着土壤中锶浓度的升高而增加,并表现为叶>根>茎。转运系数随着土壤中锶浓度的升高而降低,在1000 mg/kg时小于1,而在其他锶处理中均大于1。本德在25 mg/kg时的转运系数最高(2.026);3)高浓度锶增加了燕麦的MDA含量并抑制了POD活性,而SOD活性随着锶浓度增加而升高。结果表明,燕麦的根、茎、叶均能积累锶,叶片的富集能力最强。4个燕麦品种具有锶超富集植物的特征。低浓度锶可以诱导燕麦中抗氧化酶活性的增强,促进其生长;高浓度锶处理中SOD和CAT在清除活性氧中发挥重要作用。综合评价,本德可用于治理锶轻度污染地区,而定莜6号可用于治理锶重度污染地区,为燕麦用于锶污染地区的植物修复提供理论依据。

Abstract: Strontium (Sr) is a common fission product of U-235 and Pu-239. Radioactive isotopes are toxic because they are heavy metals and also because of their radioactivity. The fate of radio nuclides in the environment is similar to that of stable elements therefore the behavior of stable Sr-88 in the environment should be regarded as a useful analogue for predicting the long-term fate of Sr-90. Phytoremediation is an emerging alternative technology which utilizes plants to remove metals from the environment. To investigate the ability of oats to accumulate strontium four oat varieties (Bende, Baiyan No.2, Baiyan No.7 and Dingyou No.6) were exposed to five strontium levels (0, 25, 100, 500 and 1000 mg/kg). Plants were cultivated for 30 days. Strontium accumulation and distribution in plants, growth, MDA content, as well as POD, SOD and CAT activity were measured. The results showed that the root and shoot biomass of oat seedlings were increased early and decreased later with increased strontium concentration. Strontium accumulation increased with increased strontium levels; ranked leaf> root>stem. Translocation decreased with increasing strontium concentration. The high strontium treatments increased the MDA content and inhibited POD activity whereas SOD activity increased. The root, stem and leaf of oats could accumulate strontium but most was accumulated in the leaf. All four varieties were able to be classified as hyper accumulators of strontium. Low strontium concentration increased the activities of antioxidant enzymes.Under high strontium concentrations SOD and CAT played an important role in scavenging active oxygen. Oats were able to accumulate and tolerate high concentrations of strontium and could be used for phytoremediation of strontium polluted soils.