• Ames, B.N. (1964) Assay of inorganic phosphate, total phosphate, and phosphatases. Methods Enzymol 8: 115118.
  • Anonymous (1995) Sorghum and Millets in Human Nutrition. Food and Nutrition Series, No. 27. Rome, Italy: Food and Agriculture Organization of the United Nations.
  • Biville, F., Turlin, E., and Gasser, F. (1991) Mutants of Escherichia coli producing pyrroloquinoline quinone. J Gen Microbiol 137: 17751782.
  • Cleton-Jansen, A.M., Goosen, N., Fayet, O., and Van De Putte, P. (1990) Cloning, mapping and sequencing of the encoding Escherichia coli quinoprotein glucose dehydrogenase. J Bacteriol 172: 63086315.
  • Glick, B.R., Brooks, H.E., and Pasternak, J.J. (1985) Transformation of Azotobacter vinelandii with plasmid DNA. J Bacteriol 162: 276279.
  • Goldstein, A.H. (1986) Bacterial solubilization of mineral phosphates: historical perspective and future prospects. Am J Altern Agricult 1: 189200.
  • Goldstein, A.H. (1995) Recent progress in understanding the molecular genetics and biochemistry of calcium phosphate solubilization by Gram-negative bacteria. Biol Agricult Horticult 12: 185193.
  • Holguin, G., and Glick, B.R. (2003) Transformation of Azospirillum brasilence Cd with an ACC deaminase gene from Enterobacter cloacae UW4 fused to the tetr gene promoter improves its fitness and plant growth promoting ability. Microbiol Ecol 46: 122133.
  • Hommes, R.W.J., Postma, P.W., Neijssel, O.M., Tempest, D.W., Dokter, P., and Duine, J.A. (1984) Evidence of a quinoprotein glucose dehydrogenase apoenzyme in several strains of Escherichia coli. FEMS Microbiol Lett 24: 329333.
  • Kennedy, C., and Toukdarian, A. (1987) Genetics of Azotobacters: application to nitrogen fixation and related aspects of metabolism. Ann Rev Microbiol 41: 227258.
  • Kishore, G.K., Pande, S., and Podile, A.R. (2005) Phylloplane bacteria increased seedlings emergence, growth and yield of field-grown groundnut (Arachis hypogaea L.). Lett Appl Microbiol 40: 260268.
  • Matsushita, K., Arents, J.C., Bader, R., Yamada, M., Adachi, O., and Postma, P.W. (1997) Escherichia coli is unable to produce pyrroloquinoline quinone (PQQ). Microbiology 143: 31493156.
  • Morales, V.M., Backman, A., and Bagdasarin, M. (1991) A series of wide-host-range low-copy-number vectors that allow direct screening for recombinants. Gene 97: 3947.
  • Nautiyal, C.S. (1999) An efficient microbiological growth medium for screening phosphate solubilizing microorganisms. FEMS Microbiol Lett 170: 265270.
  • Newton, J.W., Wilson, P.W., and Burris, R.H. (1953) Direct demonstration of ammonia as an intermediate in nitrogen fixation by Azotobacter. J Biol Chem 204: 445451.
  • Podile, A.R., and Kishore, G.K. (2006) Plant growth promoting rhizobacteria. In Plant Associated Bacteria. Gnanamanickam, S.S. (ed.). Dordrecht, the Netherlands: Springer, pp. 195230.
  • Sambrook, J., Fritsch, E.F., and Maniatis, T. (1989) Molecular Cloning: A Laboratory Manual. Cold Spring Harbor, NY, USA: Cold Spring Harbor Laboratory Press.
  • Sasi Kala, K., Ramana, Ch.V., Raghuveera Rao, P., and Subrahmanyam, M. (1990) Photoproduction of hydrogen, nitrogenase and hydrogenase activities of free and immobilized whole cells of Rhodobacter sphaeroides OU 001. FEMS Microbiol Lett 72: 2328.
  • Vikram, A., Alagawadi, A.R., Krishnaraj, P.U., and Mahesh Kumar, K.S. (2007) Transconjugation studies in Azospirillum sp. negative to mineral phosphate solubilization. World J Microbiol Biotechnol 23: 13331337.