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Articles by Imran A. Siddiqui
Total Records ( 7 ) for Imran A. Siddiqui
  S. Shahid Shaukat , Nadia Munir and Imran A. Siddiqui
  The effects of Conyza canadensis (L.) Cronquist on seed germination and early seedling growth of six test plants namely tomato, radish, wheat, corn, millet and mungbean was investigated. Aqueous extract of C. canadensis at different concentrations (25, 50, 75 and 100% stock solution) inhibited the germination, root and shoot growth of all the six test species. Germination was reduced by the shoot extract in the order: tomato > radish > millet = corn > mungbean > wheat. Both root and shoot growth of the test species were reduced to varying degree and shoot growth was usually affected to a greater degree than the root growth, particularly in tomato. Decaying shoot of C. canadensis in sandy-loam at 5, 10 and 20 g/ 400 g soil substantially inhibited germination and seedling growth of bulrush millet (Pennisetum americanum) at all the dosages and no germination occurred at the highest dosage (20 g/400 g soil). Bioassay of the ether extract of C. canadensis disclosed two significant zones of inhibition at Rf values of 0.2-0.3 3 and 0.7-0.8. Chromatography for the phenolics revealed the presence of four phenolic compounds: gallic acid, vanillic acid, catechol and syringic acid.
  Zenab Rebaz , S. Shahid Shaukat and Imran A. Siddiqui
  Effect of Anagallis arvensis L. on seed germination and early seedling growth of six test species was examined. Aqueous extract of A. arvensis inhibited germination, root and shoot growth of all the six test species. The species exhibited differential response to the extract. Germination was reduced by the shoot extract in the order: pearl millet > mustard > carrot > turnip > wheat = corn. Decaying A. arvensis in sandly-loam soil at 5, 10 and 20 g / kg soil substantially inhibited germination and seedling growth of pearl millet at all the dosages. Bioassay of the extract of A. arvensis revealed two zones of inhibition at Rf values 0.8-0.9 and 0.9-1.0. Chromatography for the phenolics revealed the presence of three phenolic acids: salicylic acid, cinnamic acid and caffeic acid.
  Zamarrud Tajuddin , S. Shahid Shaukat and Imran A. Siddiqui
  Effect of Solanum forskalii Dunal on seed germination and early seedling growth of three test plants namely mustard, wheat and corn was examined. Aqueous extract of S. forskalii at different concentrations (25, 50, 75 and 100% stock solution) inhibited the germination, root and shoot growth of all the three test species. Germination and growth were reduced by the shoot extract in the order: mustard > corn > wheat. Decaying shoot of S. forskalii in sandy loam at 5, 10 and 20 g/kg soil substantially inhibited germination and seedling growth of bulrush millet (Pennisetum americanum) at all the dosages. Bioassay of the ether extract of S. forskalii revealed four zones of inhibition at Rf values 0.1-0.2,0.2-0.3, 0.8- 0.9 and 0.9-1.0. Chromatography for the phenolics revealed the presence of nine phenolic compounds: salicylic acid, vanillic acid, syringic acid, catechol, gentisic acid, 4-methylresorcinol, protocatechuic acid, pyrogallol and an unknown.
  S. Shahid Shaukat , Zamarrud Tajuddin and Imran A. Siddiqui
  The effects of Launaea procumbens (Roxb.) Rammaya and Rajgopal on seed germination and early seedling growth of four test plant species including mustard, bulrush millet, corn and spinach was evaluated under laboratory conditions. Aqueous extract of L. procumbens at different concentrations (25, 50, 75 and 100% stock solution) inhibited germination of three test species in the order: spinach > mustard > corn; germination of millet was not significantly influenced. Root and shoot growth of all four species was substantially reduced by Launaea extract. The growth was reduced in the order: spinach > mustard > corn > millet. When different modes of extract application were tested, it was found that only the soil application of the aqueous extract had a significant retarding effect on wheat growth while shoot spray or root dip treatment had no such effect. Decaying shoot of L. procumbens in sandy-loam at 5, 10 and 20 g/400 g soil caused substantial inhibition of germination and seedling growth of bulrush millet (Pennisetum americanum) at high dosages. Bioassay of the ether extract of L. procumbens exhibited four zones of inhibition at Rf values 0.1-0.2, 0.7-0.8, 0.8- 0.9 and 0.9-1.0 while a promoter was detected between Rf values 0.3-04. A thin-layer chromatography for the phenolics showed the presence of seven phenolic acids including: salicylic acid, vanillic acid, syringic acid, 2-methylresorcinol, gallic acid and two unknowns.
  S. Shahid Shaukat and Imran A. Siddiqui
  Mineral 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.
  Zarina Begum , S. Shahid Shaukat and Imran A. Siddiqui
  Aqueous shoot extract of four weed species including Conyza canadensis, Blumea obliqua, Amaranthus viridis and Eclipta prostrata inhibited egg hatch and caused mortality of Meloidogyne javanica, the root-knot nematode juveniles in vitro to varying extent with A. viridis being the most effective. The efficacy of the powdered shoot material as soil organic amendment was tested against two nematode inoculum levels (2000 and 4000 J2 pot G 1) in a pot experiment. Soil amendment with the powdered shoot material generally reduced nematode population density, root-knot development and reproductive potential of M. javanica in brinjal roots. A. viridis was most effective in the suppression of root-knot nematode at both the nematode inoculum rates but caused slightly reduction in plant growth presumably owing to its allelopathic activity in soil.
  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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