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Articles by Nasima Imam Ali
Total Records ( 2 ) for Nasima Imam Ali
  S. Shahid Shaukat , Imran Ali Siddiqui , Nasima Imam Ali and M. J. Zaki
  Efficacy of soil amendment with Lantana camara and various concentrations of three phenolics (caffeic acid, p-hydroxybenzoic acid and (p-coumaric acid) were tested against the soil-borne root-infecting fungi (Fusarium solani and Rhizoctonia solani) in unsterilized sandy-loam soil. The potential impact of L. camara amendment on the rhizosphere population of Pseudomonas aeruginosa and consequent biocontrol potential was also evaluated. Powdered L. camara and its aqueous extract caused substantial suppression of F. solani and R. solani infection in mungbean roots. At high concentration of L. camara (1% w/w), population of P. aeruginosa in the rhizosphere declined but not to a degree that could reduce biological control and growth promoting potential of the bacterium. L. camara and P. aeruginosa used together caused greater suppression of the root-infecting fungi as compared to their individual application. P. aeruginosa mixed with L. camara also resulted in enhanced plant growth. Soil application of caffeic acid at the rate of 10-μg/g soil caused complete inhibition in germination of mungbean. With an increase in phenol concentration, plant growth was progressively reduced and root infection caused by F. solani and R. solani was suppressed. Caffeic acid at 5-μg/g soil caused greater suppression of F. solani whereas p -hydroxybenzoic acid at 10 μ g/g resulted in the maximum inhibition of R. solani.
  S. Shahid Shaukat , Imran A. Siddiqui and Nasima Imam Ali
  Powdered shoot extract of Launaea procumbens, a tropical ruderal and agrestal weed, inhibited egg hatch and caused mortality of Meloidogyne javanica juveniles in vitro. However, ethanol extract of L. procumbens did not inhibit radial growth of root-infecting fungi including Macrophomina phaseolina, Fusarium solani and Rhizoctonia solani in vitro. Soil amendment with powdered shoot of L. procumbens markedly reduced root-knot infection caused by M. javanica in mungbean. Population densities of M. javanica were significantly lower in soil amended with 5.0% L. procumbens while a 2.5% amendment did not produce significant reduction in the nematode populations in soil. Whereas low dosage (2.5%) of L. procumbens significantly enhanced plant growth, high dosage (5%) reduced fresh shoot and root weights of mungbean indicating allelopathic effect. Soil amendment with L. procumbens resulted in marked changes in fungal community structure and composition. Fungi like Fusarium semitectum and a sterile fungus (red pigmented) were exclusively isolated from L. procumbens amended soils. On the other hand, all the fungal species isolated from L. procumbens amended soils were also present in unamended soils. Soil amendments with L. procumbens also altered fungal community structure in the root tissues of mungbean. Both general diversity and equitability of fungal community at 2.5% L. procumbens increased appreciably over the controls but at 5% dosage substantially decreased compared to controls, substantially though species richness declined at both the dosages. Dominance concentration followed an opposite trend to that of general diversity.
 
 
 
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