Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2003.575.579Meloidogyne javanica by the Antagonistic Rhizobia]]>ShaukatS. Shahid Imran A. Siddiqui 6200366Mineral amendments influence the performance of antagonistic microorganism to suppress soil-borne fungal and nematode diseases. Experiments were conducted to evaluate the influence of zinc on the production of nematicidal compound(s) in vitro and root-knot infection by Meloidogyne javanica in tomato. Nutrient rich medium amended with various concentrations (0.25-2.0 mM) markedly improved the nematicidal activity of rhizobia in vitro. Species and even strain-specific differences were observed among bacteria with respect to their response to different zinc concentrations. Efficacy of the 10 different isolates (66.6% of the total isolates) was maximum when growth medium was amended with zinc at 1.5 mM while 4 isolates (26.6% of the total isolates) exhibited optimal performance when exposed to 2.0 mM zinc. In vitro nematicidal activity of only one strain was optimal at 1.0 mM zinc. Soil amendment with zinc in the form of ZnSO4 at 0.9 mg/kg of soil alone or in conjunction with rhizobia caused significant inhibition of root-knot development and enhanced the growth of tomato plants under glasshouse conditions.]]>Chaintreuil, C., E. Giraud, Y. Prin, J. Lorquin and A. Ba et al.,2000Oryza breviligulata.]]>6654375447Cook, R.J.,1993315380Duffy, B.K. and G. Defago,19978712501257Duffy, B.K. and G. Defago,1995Pseudomonas fluorescens CHAO.]]>8511461146Hofte, M., Q. Dong, S. Kourambas, V. Krishnapillai, D. Sherratt and M. Mergeay,1994sss gene product, which affects pyoverdine production in Pseudomonas aeruginosa 7NSK2, is a site-specific recombinase.]]>1410111020Huber, D.M.,19891989pp: 46-74pp: 46-74Huyer, M. and W.J. Page,1989Azotobacter vinelandii and its inhibition by Zn2+.]]>17140314037Loper, J.E. and M.D. Henkels,1997Pseudomonas fluorescens in rhizosphere and bulk soil evaluated with an ice nucleation reporter gene.]]>6399105Mandal, N.C. and A.K. Sinha,1992Fusarium wilt of tomato.]]>45194198Maurhofer, M., C. Reimmann, S.P. Sacherer, S. Heeb, D. Haas and G. Defago,1998Pseudomonas fluorescens strain P3 improve the induction of systemic resistance in tobacco against tobacco necrosis virus.]]>88678684Siddiqui, I.A. and S.S. Shaukat,2002in vitro and improve the biocontrol of Meloidogyne javanica in tomato by Fluorescent pseudomonads.]]>35212217Siddiqui, I.A., S. Ehteshamul-Haque, M.J. Zaki and A. Ghaffar,2000531322Siddiqui, I.A., S. Ehteshamul-Haque, M.J. Zaki and A. Ghaffar,1998Stoechospermum marginatum and Sargassum tenerrimum) and rhizobia in control of root-knot disease and growth of mungbean.]]>16145149Siddiqui, I.A., S.S. Shaukat and M. Hamid,20022002Simon, A. and K. Sivasithamparam,1989Gaeumannomyces graminis var. tritici in soil.]]>21331337Weller, D.M. and L.S. Thomashow,19941994pp: 1-18pp: 1-18Engelhard, A.W.,1989