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Articles by Imran Ali Siddiqui
Total Records ( 6 ) for Imran Ali Siddiqui
  Imran Ali Siddiqui
  Forty-one isolates of 38 species of fungi and 24 isolates of 8 species of bacteria were tested in dual culture plates. Penicillium sp., 2 unidentified bacteria and a sterile fungus were found to inhibit the growth of Pythium aphanidermatum producing zones of inhibitions of 7, 11,4 and 6 mm respectively, around the colony of the pathogen. One strain each of Rhizobium meliloti, Bradyrhizobium sp., and Pseudomonas aeruginosa initially producing zones of inhibition of 15, 20 and 2 mm respectively, but later the pathogen grew and colonies met each other. Similarly, G. , virens initially produced a zone of inhibition of 20 mm but later on the pathogen over grew the zone of inhibition and colonies intermingled. A strain of P. aeruginosa also inhibited the growth of P. aphanidermatum without producing zone of inhibition.
  Fatima S. Mehdi and Imran Ali Siddiqui
  The fungal communities of Avicennia marina and Rhizophora mucronata were studied and results were evaluated in terms of occurrence distribution and dominance of fungal species. Species of Alternaria marina, Aspergillus spp, Chaetomium spp. Cladosporium spp, Fusarium spp and Penicillium spp., were found to be the most constituent mycoflora of intertidal mud and water. The mangrove examined revealed a preponderance population of Deuteromycotina whereas Ascomycotina and Mastigomycotina were poorly represented . The results of the study lead us to the conclusion that mangrove swamp is a potential habitat for fungal inhabitation.
  Fatima S. Mehdi , Imran Ali siddiqui , Shazia Erum and Rajab Ali
  Potential of Avicennia marina (mangrove) with Paecilomyces lilacinus for the control of root infecting fungi viz., Macrophomina phaseolina, Fusarium solani, Rhizoctonia solani and Meloidogyne javanica root knot nematode was evaluated invitro and under green house conditions. Soil amendment with A. marina alone or in combination with P. lilacinus significantly controlled root rot-root knot diseases in tomato with enhancement in plant growth. Organic amendment enhanced biocontrol efficacy of P. lilacinus in the control of root pathogens.
  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 and Imran Ali Siddiqui
  Aqueous extract of six weed species including Argemone mexicana, Sonchus asper, Abutilon indicum, Xanthium strumarium, Solanum nigrum and Mavastrum coromandelianum were tested for their activity towards egg hatching and juvenile mortality of Meloidogyne javanica, the root-knot nematode. Aqueous extract of A. mexicana was most lethal to M. javanica juveniles and caused significant inhibition in egg hatching. In general, with an increase in extract concentration and duration for which the juveniles were exposed, mortality increased markedly. Results demonstrated that A. mexicana could be exploited for the suppression of root-knot disease in crops.
  Imran Ali Siddiqui and Syed Shahid Shaukat
  Plant growth-promoting rhizobacterium Pseudomonas aeruginosa strain IE-6S+ suppresses root-knot nematode (Meloidogyne spp) indirectly by enhancing defense mechanism leading to induced systemic resistance in tomato. However, which determinants are important in the induction of resistant reaction in plants against nematode by IE-6S+ is yet fully understood. Salicylic Acid (SA) production by bacteria acts as endogenous signal for the activation of certain plant defense responses. In a split root trial with tomato plant as a host and M. javanica as challenging pathogen, IE-6S+ induced systemic resistance in both wild type and NahG tomato seedlings. Moreover, the bacterial efficacy against nematode was not altered when soil chemical compositions was changed by the addition of iron. These results suggest that P. aeruginosa IE-6S+ suppress root-knot nematode indirectly via enhanced defense mechanism in plants, which is independent of SA accumulation in the host.
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