Bacillus amyloliquefaciens YM6对盐胁迫条件下玉米促生长作用研究

Effect of Bacillus amyloliquefaciens YM6 on Growth Promotion of Maize Under Salt Stress

以解淀粉芽孢杆菌YM6(Bacillus amyloliquefaciensYM6)为对象,研究其在盐胁迫条件下对玉米的促生效果,为提高盐碱地作物产量开发新型菌源。利用水培试验,设置0、25、50、75和100 mmol/L NaCl的植物营养液,培养玉米植株,同时接种YM6菌株,观察其对盐胁迫下玉米生长的影响。结果表明,在75 mmol/L的盐胁迫条件下,与盐胁迫对照组相比接种YM6菌株组的玉米幼苗株高增加15.18%、根长增加28.80%,植株干重增加27.01%。在盐碱土盆栽试验中,接种YM6菌株组的玉米株高比未接种YM6组增加37.8%,植株干重增加43.9%。此外,YM6菌株能够在玉米根系定殖。初步研究表明YM6菌株可有效缓解盐胁迫对玉米生长的不利影响,促进玉米生长。

Bacillus amyloliquefaciens strain YM6 isolated from soil is able to mitigate the salt stress on maize.More detailed effects of stress relieving by this strain need to be elucidated.Provide new bacterials for the production of non-halophyte such as Maize and the improvement of saline soils in related areas.Maize seedlings were growing in hydroponic jars containing plant nutrients solution amended different concentrations of NaCl.YM6 was inoculated to these salt stressed seedlings,and plant growth was measured and analyzed.Results showed under 75 mmol/L NaCl stress,compared to the un-inoculated control,plant height increased by 15.2%when YM6 was inoculated to roots of maize seedlings.Root length and plant dry weight of inoculated maize increased by 28.8%and 27.0%respectively as compared to uninoculated control.In the bonsai experiments with saline-alkali soil,plant height and dry weight of maize treated with YM6 increased by 37.8%and 43.9%respectively as compared to the un-inoculated control.Strain YM6 was also found to colonize maize root.Our preliminary results indicated that YM6 is able to alleviate the adverse effects of salt stress on maize.