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Articles by S. H. Khan
Total Records ( 2 ) for S. H. Khan
  K. Shahzad , M. A. Chowdhry , D. Hussain , Z. Mohy-ud-Din , S. Haidar , K. Alam and S. H. Khan
  A set of 4 4 diallel crosses in wheat was analysed for combining ability of traits like number of tillers per plant, spike length, number of grains per spike and 1000-grain weight. The mean squares for general (GCA) and specific combining ability (SCA) were highly significantly for number of grains per spike and 1000-grain weight. The reciprocal effects were also highly significant for all traits under study except spike length which was non-significant. The additive gene effect controlled the expression of number of tillers per plant and 1000-grain weight as is evidenced by greater components of variance for GCA. Non-additive gene effects controlled the expression of spike length and number of grains per spike as is apparent by greater components of variance for SCA. Variety Pitic 62 was considered to be good general combiner for spike length, number of grains per spike and 1000-grain weight.
  S. Mansoor , M. Hussain , S. H. Khan , A. Bashir , A. B. Leghari , G. A. Panwar , W.A. Siddiqui , Y. Zafar and K. A. Malik
  Samples of cotton plants showing symptoms of cotton leaf curl disease were collected from cotton fields in Sindh. Samples of some other plants including tomato, chillies, okra and Hibiscus suspected for whitefly-transmitted geminiviruses were also collected from these areas and total DNA was extracted. Degenerate primers designed to amplify DNA-A of whitefly-transmitted geminiviruses were used in PCR for the amplification of viral DNA. A product of expected (1.4 kb) was obtained from all these samples which confirmed the infection of whitefly-transmitted geminiviruses. PCR primers specific for the two whitefly-transmitted geminiviruses species namely CLCuV-Pk1 and CLCuV-Pk2 found associated with cotton leaf curl disease in Punjab were also used to confirm identity of cotton leaf curl virus in Sindh. A product specific for CLCuV-Pk1 was obtained from all four symptomatic cotton samples. The results showed that cotton samples were infected with CLCuV-Pk1 while CLCuV-Pk2 was not detected in these samples. This is the first report of detection of whitefly-transmitted geminiviruses on these crops from Sindh. Our data not only confirm the presence of a whitefly-transmitted geminivirus on cotton but also showed that the disease is caused by one of the virus species found in Punjab.
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