Enterobactersp.NG-33菌株对玉米根系及植株中氮磷钾含量的影响

Effect of Enterobacter sp. NG-33 Strain on Root and the Nitrogen,Phosphorus and Potassium Content in Plant of Maize

Enterobacter sp.NG-33是新筛选分离到能高效溶解不溶性无机磷且产吲哚乙酸的菌株。本研究采用盆栽方式,分析在黄潮土与缺磷土壤中,接种Enterobacter sp.NG-33对苗期玉米的根系发育及植株中氮磷钾含量的变化,探索菌株NG-33在不同土壤条件对苗期玉米生长的促生机制。结果表明,菌株NG-33能够在不同土壤条件下,提高玉米根系的根长、表面积、从根数目和分枝数,促进玉米根系的发育。在缺磷条件下,NG-33菌株促进了玉米根系对磷元素的吸收。而在黄潮土壤中该菌株可以促进玉米根系对氮和钾元素的吸收作用。因此,在土壤中接种Enterobacter sp.NG-33菌株能促进苗期玉米根系的发育并改善植株对氮、磷和钾元素的吸收。

Strain Enterobaeter sp. NG-33 was newly isolated in our laboratory, which could dissolve insoluble phosphorus effectively and produce indole-3-acetic acid （IAA）. A potted experiment was designed to analyze effect of inoculating Enterobacter sp. NG-33 on root growth and the content of nitrogen （N）, phosphorus （P） and potassium （K） in plant of seedling maize which were grown in common soil and P-deficit soil. Then, we explored the growth promoting mechanism of different soil conditions on the growth of seedling maize. The results showed that strain NG-33 could increase the root length （Len）, surface area （SA） and root volume （VoL）, and promote the development of root system. While under P-deficit condition, strain NG-33 promoted the absorption of phosphorus in maize roots. In addition, this strain in common soil could promote the absorption of nitrogen and potassium in maize roots. Therefore, the inoculation of strain Enterobaeter sp. NG-33 in soil could accelerate the development of root system and improve the absorption of N, P and K of plant.