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1、Symbiosis(2011)54:159–166DOI10.1007/s13199-011-0139-xGrowthpromotioneffectsoftheendophyteAcinetobacterjohnsoniistrain3-1onsugarbeetYingwuShi&KaiLou&ChunLiReceived:24August2011/Accepted:5November2011/Publishedonline:18November2011#SpringerScience+BusinessMediaB.V.2011AbstractAnendophyticbacteriumnid
2、entifiedasAcineto-KeywordsSugarbeet.Endophyticbacteria.Acinetobacterbacterjohnsoniistrain3–1wasisolatedfromsurface-johnsonii.Growthpromotion.ColonizationsterilizedrootsofBetavulgaris.Itseffectonsugarbeetseedlinggrowthwasstudiedusingpotassaysandfieldexperiments.Thisstrainpromotedbeetseedlinggrowth1I
3、ntroductionfollowingseedinoculationbyseeddipping.Plantheightanddryweightofbeetincreasedby19%and69%,Sugarbeetisthemostimportantsugarcropintherespectively,comparedwithcontrols.Strain3–1exhibiteddevelopingworld.FertilizersandpesticidesarethemosttheabilitytoincreaseabsorptionofN,P,K,andMgimportantinput
4、sforbeetproductionbutusinggrowth-elementsfromsoilandincreasethecontentofvitaminsBpromotingbacteriacancontributetomakingbeetcultivationandC,andproteinwithinbeet.Inaddition,thestrainalsosustainableandlessdependentonfertilizers.Amongsuchproducedaphytohormone-auxin,producednearlytwiceasbacteriaarerhizo
5、bacteria,whichcolonizeplantrootsandmuchIAAasthatproducedbystrain2–2,andwasabletoconsumerootexudatesandlysates(Pieterseetal.,2002;solubilizephosphates.TheconcentrationofdissolvedPinAntounandPrevost,2006).Somestrains,thegrowth-−1themediumwas180.5mgLafter4daysofincubation.promotingrhizobacteria(PGPR),
6、canpromoteplantgrowth.Infieldexperiments,strain3–1significantlyincreasedtheTheyimprovethecyclingofnutrientsandmineralssuchascontentofsucrose,fructose,andtheyieldofthebeet.Thenitrogen,phosphateandcanbeusedasbiofertilizersgrowth-promotingpropertiesofAcinetobacterjohnsonii(Kennedyetal.,2004).Thegrowth
7、-promotingeffectsofstrain3–1indicatesthatthispromisingisolatemeritsPGPRareaffectedbyenvironmentalconditionsandthere-furtherinvestigationintoitssymbiosiswithbeetplantsforearenotstable.Endophytesincludingavar
