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1

Effects of cell suspension and cell-free culture filtrate of Pseudomonas aeruginosa in the control of root rot-root knot disease complex of tomato [Lycopersicon esculentum Mill.]

100%
Siddiqui I. A.
Acta Agrobotanica
|
2000
|
tom 53
|
nr 2
The plant growth-promoting rhizobacterium Pseudomonas aeruginosa strain IE-6 was tested for antagonistic activity towards Meloidogyne javanica, the root-knot nematode and soilbome root-infecting fungi viz., Macrophomina phaseolina. Fusarium solani and Rhizoctonia solani under laboratory and greenhouse conditions. Cell-free culture filtrate of the bacterium caused significant reduction in egg hatching of M. javanica and inhibited radial growth of fungi in vitro. Cell-free culture filtrate also caused lyses in mycelium of F. solani. Under greenhouse conditions, soil drenches with the aqueous celi suspension or cell-free culture resulted in a considerable reduction in nematode population densities in soil and subsequent root-knot development due to M.javanica. In addition to nematode control, rhizobacterium application also inhibited root-infection caused by soilborne root-infecting fungi with significant enhancement of growth of tomato seedlings.
2

Trigonella foenum-graecum [fenugreek]-mediated suppression of Meloidogyne javanica in mungbean

100%
Zia T., Siddiqui I. A., Shaukat S. S., Nazarul-Hasnain S.
Acta Agrobotanica
|
2002
|
tom 55
|
nr 2
Soil amendments with powdered seeds of Trigonella foenum - graecum (fenugreek) caused soil suppressiveness against Meloidogyne javanica. Decomposed seeds of fenugreek caused marked reduction in nematode population densities and subsequent root-knot development as compared to the aqueous extract of the seeds indicating that some indirect factors are involved in the suppression of root-knot nematode. Both decomposed seeds and aqueous extracts enhanced plant height and fresh weights of Dat whereas root growth remained uninfluenced. Changes in fungal communities associated with nematode control were studied by comparing population numbers of :ngi in the soil and in internal root tissues (endorhiza) in non-amended and fenugreekanded soils. Acremonium sp., Chaetomium globosum, Fusarium solani, Macropho'na plwseolina and Rhizoctonia solani were found to colonize inner root tissues of ugbean. Acremonium sp., C. globosum and F.solani were isolated in a relatively her frequency from roots growing in the amended soils while M. phaseolina and R.solani colonized greatly in roots growing in non-amended soil. Of the fungi isolated soils, Penicillium brefaldianum caused maximum juvenile mortality of M. javanica whereas F.solani caused greatest inhibition of egg hatch.
3

Effect of systemic fungicides on the efficacy of Pseudomonas aeruginosa [Schroeter] migula in the control of root-infecting fungi of wheat

100%
Siddiqui I. A., Shaukat S. S., Ehteshamul-Haque S., Khan S. A. J.
Acta Agrobotanica
|
2000
|
tom 53
|
nr 2
Effect of various fungicides on the efficacy of Pseudomonas aeruginosa, a plant growth-promoting rhizobacterium in the control of root-infecting fungi such as Macrophomina phaseolina, Fusarium oxysporum and F. solani on four different varieties of wheat was evaluated under field conditions. Bayleton (aj. triadimephon), Bavistin (aj. carbendazym) and Topsin-M (aj. thiophanate-methyl) reduced bacterial survival on wheat seeds whereas Benlate (aj. benomyl) was not effective in this respect. P. aeruginosa used in combination with Benlate showed effective control of soilborne root-infecting fungi along with the enhancement of growth and grain yield of wheat.
4

Use of plant growth-promoting rhizobacteria [PGPR] and soil organic amendments for the management of root diseases complex of uridbean

80%
Siddiqui I. A., Shaukat S. S., Ehteshamul-Haque S.
Acta Agrobotanica
|
2001
|
tom 54
|
nr 1
Efficacy of two strains of Pseudomonas aeruginosa (Pa-5 and IE-2) and aBacillus subtilis isolate alone or in conjunction with neem cake or Datura fastuosa was tested for the management of three soilborne root-infecting fungi including Macrophomina phaseolina, Fusarium solani and Rhizoctonia solani and the root-knot nematode, Meloidogyne javanica on uridbean. Biocontrol bacteria used in combination with either neem cake or D. fastuosa gave better control of the root-rot and root-knot infection with the enhancement of growth of uridbean compared to the use of either component alone. Neem cake 1 % w/w mixed with P. aeruginosa strain lE-2 caused greatest inhibition of the root-knot development due to M.javanica. P. aeruginosa and B. subtilis used with organic amendment also increased Bradyrhizobium-nodules in the root system.
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