title: Rhizosphere competent Pantoea agglomerans enhances maize (Zea mays) and chickpea (Cicer arietinum L.) growth, without altering the rhizosphere functional diversity.
abstract: Plant growth promoting Pantoea agglomerans NBRISRM (NBRISRM) was able to produce 60.4 μg/ml indole acetic acid and solubilize 77.5 μg/ml tri-calcium phosphate under in vitro conditions. Addition of 2% NaCl (w/v) in the media induced the IAA production and phosphate solubilization by 11% and 7%, respectively. For evaluating the plant growth promotory effect of NBRISRM inoculation a micro plot trial was conducted using maize and chickpea as host plants. The results revealed significant increase in all growth parameters tested in NBRISRM inoculated maize and chickpea plants, which were further confirmed by higher macronutrients (N, P and K) accumulation as compared to un-inoculated controls. Throughout the growing season of maize and chickpea, rhizosphere population of NBRISRM were in the range 10(7)-10(8) CFU/g soil and competing with 10(7)-10(9) CFU/g soil with heterogeneous bacterial population. Functional richness, diversity, and evenness were found significantly higher in maize rhizosphere as compared to chickpea, whereas NBRISRM inoculation were not able to change it, in both crops as compared to their un-inoculated control. To the best of our knowledge this is first report where we demonstrated the effect of P. agglomerans strain for improving maize and chickpea growth without altering the functional diversity.
authors.affiliation: Division of Plant Microbe Interactions, National Botanical Research Institute, Rana Pratap Marg, Lucknow, India.
authors.forename: Aradhana
authors.initials: A
authors.lastname: Mishra
authors.forename: Puneet Singh
authors.initials: PS
authors.lastname: Chauhan
authors.forename: Vasvi
authors.initials: V
authors.lastname: Chaudhry
authors.forename: Manisha
authors.initials: M
authors.lastname: Tripathi
authors.forename: Chandra Shekhar
authors.initials: CS
authors.lastname: Nautiyal
mesh_terms: D044822:Biodiversity; D029863:Cicer / Q000254:growth & development / Q000382:microbiology*; D008969:Molecular Sequence Data; D020636:Pantoea / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology*; D010802:Phylogeny; D018517:Plant Roots / Q000254:growth & development / Q000382:microbiology; D058441:Rhizosphere; D012988:Soil Microbiology; D003313:Zea mays / Q000254:growth & development / Q000382:microbiology*