title: Physiological studies on endorhizospheric establishment of Azotobacter chroococcum in wheat.
abstract: Ten strains of Azotobacter chroococcum were studied for their ability to invade the endorhizosphere of wheat. Strain W-5 exhibited ability to invade endorhizosphere as shown in the microscopic observations. This strain was compared with the strain OA-3 which did not invade the endorhizosphere zone. Strain W-5 showed higher production of cellulase and pectinase than OA-3. Both the strains induced defense enzymes in the host plant. However, induction of peroxidase and phenylalanine ammonia lyase activities (PAL) was higher in OA-3 than W-5. Quantitative differences in flavonoid like compounds obtained from root extracts and root exudates of plants inoculated with these strains were observed.
authors.affiliation: Department of Biological Sciences, Texas Tech University, Lubbock, Texas, USA.
authors.forename: Jose
authors.initials: J
authors.lastname: Thekkiniath
authors.forename: Sangeeta
authors.initials: S
authors.lastname: Paul
authors.forename: Prem
authors.initials: P
authors.lastname: Dureja
authors.forename: Dolly Wattal
authors.initials: DW
authors.lastname: Dhar
mesh_terms: D001395:Azotobacter / Q000201:enzymology / Q000254:growth & development* / Q000378:metabolism*; D001426:Bacterial Proteins / Q000378:metabolism; D002457:Cell Extracts / Q000737:chemistry; D002480:Cellulase / Q000378:metabolism; D005419:Flavonoids / Q000032:analysis; D009195:Peroxidase / Q000378:metabolism; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D018517:Plant Roots / Q000737:chemistry / Q000382:microbiology*; D011096:Polygalacturonase / Q000378:metabolism; D014908:Triticum / Q000382:microbiology*
chemical_list: D001426:Bacterial Proteins; D002457:Cell Extracts; D005419:Flavonoids; D010940:Plant Proteins; D009195:Peroxidase; D011096:Polygalacturonase; D002480:Cellulase; D010650:Phenylalanine Ammonia-Lyase