植物根际促生菌对香蕉幼苗生长及抗枯萎病效应研究

 通过盆栽试验，研究从香蕉根际土壤分离筛选的植物根际促生菌（PGPR）芽孢杆菌PAB-1、PAB-2菌株制剂对香蕉幼苗生长、养分吸收利用和香蕉枯萎病防治的效应研究。结果表明：试验处理56 d后，施用植物根际促生菌菌剂的处理，株高、假茎围、地上部生物量、根长、根系生物量、总生物量、单株叶面积和叶绿素含量分别比对照增加18.5% ~ 28.9%、17.0% ~ 18.2%、16.8% ~ 33.9%、41.5% ~ 47.6%、65.5% ~ 69.5%、24.8% ~ 39.8%、24.0% ~ 38.3% 和 30.0% ~ 44.9%；施用PAB-2菌剂的处理，地上部氮、磷、钾、钙、镁养分吸收量分别比对照增加51.1%、46.1%、165.2%、7.4%和32.8%。接种香蕉枯萎病病原菌（FOC）的处理中，施用PGPR菌剂的香蕉叶片丙二醛含量显著低于只接种FOC4的，降低4.4% ~ 10.6%；56 d后香蕉枯萎病病情指数比只接种FOC4的降低12.5 ~ 31.3，防控效果达到18.8% ~ 46.9%。施用PGPR菌剂能显著促进香蕉苗期植株生长，提高植株养分吸收，有效防控香蕉枯萎病发生。

Effects of Plant Growth-promoting Rhizobacteria on Growth and Controlling Fusarium-wilt Disease of Banana Seedlings

Plant growth-promoting rhizobacteria(PGPR),which can promote the plant growth and yield,and inhibit plant pathogens,are microorganisms colonized in the plant rhizosphere.A pot experiment was carried out to investigate the effects of PGPR on the growth of banana seedlings,absorption and utilization of nutrient and the suppression of the banana fusarium-wilt disease.The results showed that 56 days after treatments by PGPR,the differences of height,stem diameter,above-ground biomass,root length,root biomass,total biomass,leaf area per plant and leaf chlorophyll content of banana seedlings between treatment and control were remarkable increased by 18.5%-28.9%,17.0%-18.2%,16.8%-33.9%,41.5%-47.6%,65.5%-69.5%,24.8%-39.8%,24.0%-38.3%and 30.0%-44.9%,respectively.The absorptions of N,P2O5,K2O,CaO and MgO of seedlings treated by PAB-2 were higher than those of control,increased by 51.1%,46.1%,165.2%,7.4%,32.8%respectively.Inoculated by FOC,MAD contents of leaf in the treatments of PGPR were decreased by 4.4%-10.6%.Disease Severity Indices(DIS)of banana fusarium-wilt in the treatments of PGPR were reduced by 12.5-31.3,which the total control effects reached 18.8%-46.9%.The results indicated that the application of PGPR could effectively promote growth,nutrition absorption of banana seedlings,and reduce the occurrence of banana fusarium wilt.