title: The nematicidal effect of some bacterial biofertilizers on Meloidogyne incognita in sandy soil.
abstract: In a greenhouse experiment, the nematicidal effect of some bacterial biofertilizers including the nitrogen fixing bacteria (NFB) Paenibacillus polymyxa (four strains), the phosphate solubilizing bacteria (PSB) Bacillus megaterium (three strains) and the potassium solubilizing bacteria (KSB) B. circulans (three strains) were evaluated individually on tomato plants infested with the root-knot nematode Meloidogyne incognita in potted sandy soil. Comparing with the uninoculated nematode-infested control, the inoculation with P. polymyxa NFB7, B. megaterium PSB2 and B. circulans KSB2, increased the counts of total bacteria and total bacterial spores in plants potted soil from 1.2 to 2.6 folds estimated 60 days post-inoculation. Consequently, the inoculation with P. polymyxa NFB7 increased significantly the shoot length (cm), number of leaves / plant, shoot dry weight (g) / plant and root dry weight (g) / plant by 32.6 %, 30.8 %, 70.3 % and 14.2 %, respectively. Generally, the majority treatments significantly reduced the nematode multiplication which was more obvious after 60 days of inoculation. Among the applied strains, P. polymyxa NFB7, B. megaterium PSB2 and B. circulans KSB2 inoculations resulted in the highest reduction in nematode population comparing with the uninoculated nematode-infested control. They recorded the highest reduction in numbers of hatched juveniles/root by 95.8 %, females/root by 63.75 % and juveniles/1kg soil by 57.8 %. These results indicated that these bacterial biofertilizers are promising double purpose microorganisms for mobilizing of soil nutrients (nitrogen, phosphate and potassium) and for the biological control of M. incognita.
authors.affiliation: Department of Agricultural Microbiology, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima , 11241, Cairo , Egypt.
authors.forename: M E
authors.initials: ME
authors.lastname: El-Hadad
authors.forename: M I
authors.initials: MI
authors.lastname: Mustafa
authors.forename: Sh M
authors.initials: ShM
authors.lastname: Selim
authors.forename: T S
authors.initials: TS
authors.lastname: El-Tayeb
authors.forename: A E A
authors.initials: AE
authors.lastname: Mahgoob
authors.forename: Norhan H
authors.initials: NH
authors.lastname: Abdel Aziz
keywords: B. circulans; Bacillus megaterium; Meloidogyne incognita; Paenibacillus polymyxa; biocontrol; biofertilizers; root-knot nematodes
references.citation: Bioresour Technol. 2007 Jan;98(1):69-73
references.pmid: 16458501
references.citation: J Nematol. 1999 Mar;31(1):54-61
references.pmid: 19270875
references.citation: Appl Environ Microbiol. 2005 Sep;71(9):4951-9
references.pmid: 16151072
references.citation: Bioresour Technol. 2008 May;99(8):3016-23
references.pmid: 17706411
references.citation: FEMS Microbiol Lett. 2003 May 28;222(2):243-50
references.pmid: 12770714
references.citation: Water Res. 2005 Nov;39(19):4623-32
references.pmid: 16253304
references.citation: J Invertebr Pathol. 2009 Feb;100(2):94-9
references.pmid: 19041655
references.citation: J Nematol. 1991 Jul;23(3):275-82
references.pmid: 19283127