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Physiological studies on endorhizospheric establishment of Azotobacter chroococcum in wheat
Author(s) -
Thekkiniath Jose,
Paul Sangeeta,
Dureja Prem,
Dhar Dolly Wattal
Publication year - 2010
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.200900218
Subject(s) - azotobacter chroococcum , pectinase , strain (injury) , cellulase , azotobacter , biology , inoculation , microbiology and biotechnology , enzyme , botany , phenylalanine ammonia lyase , peroxidase , chemistry , bacteria , biochemistry , food science , horticulture , genetics , anatomy
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. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)