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Articles by Kh. A. El-Dougdoug
Total Records ( 2 ) for Kh. A. El-Dougdoug
  Entsar A. Nassar , Kh. A. El-Dougdoug , M.E. Osman , Rehab A. Dawoud and Aliaa H. Kinawy
  An Egyptian isolate of a Tobamovirus was isolated and identified from Chrysanthemum cultivation in Egypt. Both biological, serological and sequence analysis of the coat protein gene demonstrated that the virus represents an isolate of the Tobamoviridae family. The isolated virus was nominated as TMV Chrysanthemum Egyptian isolate (TMV-Ch-EG). This virus isolate caused severe disease symptoms in Chrysanthemum plants with mosaic, mottling and flower discoloration. The virus was purified biologically using serial transfer of the single local lesion technique on Nicotiana gultinosa. The induced antiserum for the isolated virus had a titer 1\1024. 600 bp DNA fragments from the coat protein gene (CP) of TMV-Ch-EG was amplified with Rt-PCR technique. Phylogenetic analysis of the TMV-Ch-EG/CP- gene showed 89% nucleotide sequence homology with other published strains of TMV in GenBank and 81% amino acid sequence homology. Tissue culture approach was used to permit the recovery of TMV-Ch-free micropropagated shoots via application of 20 mg L-1 virazole followed by thermotherapy at 38°C for two weeks and early screening to facilitate the efficient production of virus-free tissue culture derived propagules using the produced antiserum against TMV-Ch-EG.
  A.A. Megahed , Kh. A. El-Dougdoug , B.A. Othman , S.M. Lashin , M.A. Ibrahim and A.R. Sofy
  The possibility of making use of the phenome non of Systemic Acquired Resistance (SAR) to control viruses achieved by the soaking treatment of tomato seeds cv. Castl Rock with three growth forms to Bacillus circulans, Pseudomonas fluorescens 2 and Trichoderma harzianum against Tomato mosaic tobamovirus (ToMV) infection. All the application forms of beneficial biotic inducers were reduced the mean number of ToMV local lesions on Datura metel. P. fluorescens 2 was found to be the best treatment in three forms on reduction of local lesion number 42.2, 32.7 and 38.1 of microbial liquid culture, microbial cells or spores and microbial culture filtrate forms, respectively, while the highest mean numbers of local lesions were 51.5, 61.7 and 73.5 of microbial liquid culture, m icrobial cells or spores and microbial culture filtrate, respectively for T. harzianum. The microbial culture filtrate form was more effective than other microbial forms to reduce mean number of ToMV local lesions to B. circulans, P. fluorescens 2 and T. harzianum isolates, 40.7, 32.1 and 51.5, respectively. The individual microbial isolates on all three microbial forms able to vary ToMV local lesions similarity (homologous or heterologous) and morphology (size center and surrounded with halo or without halo) compared with TMV mother strain.
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