莠去津对白菜幼苗生长量及生理效应的影响

【目的】研究不同浓度莠去津对白菜幼苗生长量及其生理效应的影响。【方法】采用室内播种后苗前土壤处理法，用5种不同浓度莠去津（6．0391、12．0781、24．1563、48．3125、96．6250μg／mL）处理白菜幼苗，并对白菜幼苗叶片的叶绿素、丙二醛、可溶性糖含量及生长量进行测定。【结果】莠去津对白菜芽长的影响比对根长敏感，其对白菜幼苗芽长和根长的LC10分别为4．2077和16．9191μg／mL；经莠去津处理后，白菜叶片中叶绿素的生成受到抑制，丙二醛、可溶性糖含量增加，不同处理浓度之间存在差异。【结论】莠去津对白菜幼苗的生长发育及生理指标均有影响，当莠去津的处理浓度超过其安全极限时，将会抑制白菜幼苗生长，且抑制程度随处理浓度的增大而加重。因此，生产上要注意控制莠去津使用浓度，不能随意加大用药量，以免造成药害。

Effect of atrazine on growth and physio-biochemical characteristics of cabbage seedling

Objective]The present experiment was conducted to study the effects of different atrazine concentrations on growth and some physio-biochemical characteristics of cabbage seedling. Method]The chlorophyll, malondialdehyde （MDA） and soluble sugar contents in the leaves and some growth parameters were determined in cabbage seedling treated with different concentrations of atrazine （6.0391, 12.0781, 24.1563, 48.3125 and 96.6250 μg/mL）. The treatments were applied in the soil after seed sowing and before emergence stage. Result]The impact of atrazine on cabbage bud growth was more pronounced compared to effect on root growth, the LC10 values of bud and root length were 4.2077 and 16.9191 μg/mL, respectively. The chlorophyll content of cabbage leaves was inhibited after treatment, while MDA contents and soluble sugars were increased, and the effect of different atrazine concentrations on cabbage plant differed significantly. Conclusion ] Treatments of soils with different concentrations of atrazine affected the growth and physio-biochemical processes of cab- bage. A certain level of atrazine concentration inhibited the growth processes, and the inhibitory effects were more pronounced at higher concentrations. The plant friendly concentrations of atrazine should be worked out before treatments to enhance the production.