摘要
在实验室人工控制条件下就小麦种子发芽及根伸长对不同浓度的四溴双酚-A(TBBPA)的毒性响应进行了动态观测。结果表明,在所选暴露浓度范围内,TBBPA并未对小麦种子的发芽率产生明显影响;各TBBPA暴露浓度下小麦芽生长的比生长速率(μ芽)随时间的变化趋势相同,均在污染暴露16h时达到峰值。而各污染暴露浓度下根伸长的比生长速率(μ根)随时间的变化却略有差异,其在污染暴露12￣20h这一时间段内趋于稳定且随着TBBPA暴露浓度的加大这一趋势逐渐明显;随着染毒浓度的增加,小麦芽生长的μ芽先升高,在0.02mg·L-1时达到峰值,此时TBBPA对芽生长的促进作用达到顶峰,接着μ芽又大幅度降低。随着暴露浓度的增加小麦根伸长的比生长速率(μ根)同样先升高后降低,当暴露浓度为0.05mg·L-1时μ根值最大,TBBPA对根伸长的促进作用达到顶峰。
In order to evaluate ecological risk of TBBPA, the effect of TBBPA at different concentrations on seed germination and root elongation of wheat was investigated. The results indicated that no significant effect on the germination rate was observed with the increase of TBBPA concentrations. But with the increase of TBBPA concentrations, the wheat germinated more and more slowly. The μshoot value of shoot growth firstly increased and then decreased dramatically with the increase of TBBPA concentrations. And the μshoot value of shoot growth treated with 0.02 mg·L^-1 of TBBPA was at the highest. Similarly, the μroot value of root elongation firstly increased and then decreased with the increase of TBBPA concentrations. The 0.05 mg·L^-1 TBBPA treatment significantly stimulated an increase in the μroot value of root elongation. The trend of changes in the specific growth rate（μ）value of shoot growth with exposure time was similar when treated with different TBBPA concentrations. And the peak of the μshoot value of shoot growth was detected after the 16-hour exposure. In addition, the trend of changes in the μroot value with the prolonged exposure was slightly different when treated with different TBBPA concentrations. And there were no significant differences in the μroot value of root elongation with the increase of exposure time from 12 to 20 hours as TBBPA concentrations increased.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第5期1907-1912,共6页
Journal of Agro-Environment Science
基金
高等学校科技创新工程重大项目培育资金项目(707011)
国家自然科学基金面上项目(20777040)
国家973项目(2004CB418503)
