常见重金属和农药对Bacillus pumilus WP8促生能力的影响

Effect of Common Heavy Metals and Agricultural Agents on Plant Growth Promotion Ability of Bacillus pumilus WP8

采用平板发芽生长方法,研究Cu、Pb、Zn、农用硫酸链霉素和乙草胺在各自建议浓度(Recommendedconcentration,RC)和2×RC下,Bacillus pumilus WP8对辣椒发芽生长的影响。结果表明,Cu和乙草胺在试验浓度下,辣椒均不发芽,WP8的存在未能缓解胁迫作用;Pb、Zn和农用硫酸链霉素在RC下,对WP8的促生能力,特别是根的伸长影响很小;2×RC下,Pb处理对WP8促生能力的影响依然较小,但Zn和农用硫酸链霉素处理对WP8促生能力的影响较大,但根的指标仍能达CK水平;WP8的生长状况和促生表现之间没有明显的相关性。

A germination and growth experiment using filter paper was carried out to study the effect of Cu, Pb, Zn, agri- cultural streptomycin （STM） and acetoehlor （ACT） at respective recommended concentration （RC） and 2xRC on the germi- nation of pepper seeds and the growth promotion ability of Bacillus pumilus WP8. The results showed that no germinated seeds were detected under the stress of Cu and ACT, and there was no alleviative effect when inoculated with WP8. Slight effects of Pb, Zn and STM stress at RC, as well as Pb stress at 2xRC on seedlings growth especially on root elongation were detected, and the effects of Zn and STM stress at 2~RC on seedlings growth were distinct. However, the root length index still come up to the level of control check （CK）. There was no clear definitive relationship between the growth of WP8 and the growth promotion effects. These results provided some basis for the further development of WP8.