轻稀土浸种对油菜镉铬胁迫的生物学效应.pdf

南方农业学报2011,42(12):1503-1506
Journal of Southern Agriculture
http://www.nfnyxb.com
轻稀土浸种对油萊镉铬胁迫的生物学效应
任学军,任艳军,杜彬,马建军
(河北科技师范学院,河北秦皇岛06600
摘要:【目的研究轻稀土抗油菜镉(Cd)络(Cr)重金属胁迫下的生物学效应,为重金属污染土壤中稀土农用提供
理论参考。{方法1采用单一轻稀土(Ia、Ce、Nd、r)浸种处理,通过盆栽试验,研究重金属Cd和Cr胁迫条件下油菜生长
发育对Cd、Cr元素吸收累积的影响。【结果土壤Cd、C胁迫未对油菜生长发育产生明显影响,但增加了Cd、Cr合量和累
积量,以重金属Cd累积幅度最明显;「Ia、Ce、Nd、P浸种处理均抑制土壊中重金属Cd和Cr向油菜茎叶转移与吸收,抑制
效果因油菜发育状况、上壤污染程度及稀土元素种类不同而存在差异,随重金属污染程度的加重,其抑制重金属毒害
能力增强,以Ce浸种处理效果最佳,同时促进了油菜茎叶中干物质积累。【结论】稀土浸种处理是一种抑制和减少蔬菜
重金属吸收和积累的有效途径。
关键词:稀土;浸种;重金属;生物学效应;油菜
中图分类号:S634.3
文献标志码:A
文章编号:2095-1191(2011)12-1503-04
Biological effects of soaking rapeseeds in light rare earth metals
under Cd and Cr stress
REN Xue-jun, REN Yan-jun, DU Bin, MA Jian-jun
Hebei Normal University of Science and Technology, Qinhuangdao, Hebei 066004, China
Abstract: Objective ] The present experiment was conducted to find out the biological effeets of soaking rapeseeds
in light rare-earth metals([a, Ce, Nd, Pr)on resistance of rapeseed plants to Cd and Cr stress in order to provide a theo
retical reference for agricultural application of rare earth metals in soils polluted with heavy metals. (Method] TH
owth
and development of rapeseed plants and Cd and Cr uptake and accumulation in rape plant was investigated under Cd and
Cr stress by soaking rapeseeds in single light rare earth metals, vi, La, Ce, Nd, Pr in pot clture. [Result ] The results
showed that the Cd and Cr stress in soil had no significant effects on the growth and development of rapeseed plant
rather it inereased Cd and Cr content and their accumulation. La, Ce, Nd and Pr Beed-soaking treatments inhibited the
uptake and translocation of Cd and Cr from soil to stem and leaf of rapeseed plant, and the inhibiory efeets differed with
respect to
bil pollution extent and
lent type. At higher he
tal polt
tion, the ability of rape to resist heavy metal poisoning increased, and the Ce soaking treatment showed best effect. At the
same time, the dry matter accumulation in rape stem and leaf was enhanced. [Conclusion] Seed-soaking in light rare earth
efficient way to inhibit he
Key words: rare earth; soaking; heavy metal(Cd, Cr); biological effect; rape
0引言
作物正常生长发育,降低农产品质量,还可以通过食
研究意义农田土壤污水灌溉和农药、化肥、动物链进而影响人体健康(王蘷和徐辉碧,1991;史吉平
物粪便等的不合理施用,造成农田士壤重金属污染日和牟树森,199;杨居菜等,1995宋5菲等,199通过
趋严重,其中重金属镉和铬(Cd和Gr)在植物体内累积増施改良剂或利用无毒阳离子的持抗作用等农业工
性污染最为严重(张民和龚子同,1956;张玉秀等,程措施可减少土壊重金属进人食物链,而利用植物体
2008)。研究污染农田施肥对植物重金属吸收和累积自身调节机制能减少植物体内重金属的积累(崔文
的影响,减少重金属进入食物链具有重要意义。【前人瑞等,1989;李惠英等,1992:熊礼明,1993;任学军等,
研究进展]重金属污染不仅破坏土壤生产性能,影响2011)。【本研究切入点】稀土微肥作为一种农业增产
收日期:2011-07-15
基金项目:河北省教育厅自然科学基金项目(2011157)
作者简介:任学军(970-),女,河北卢龙人,实验师,主要从事植物营养研究工作。*为通信作者,E- mail kemi163conm
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