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Articles by M.S. Khan
Total Records ( 2 ) for M.S. Khan
  R.C. Bett , A.K.F.H. Bhuiyan , M.S. Khan , G.L.L.P. Silva , Le Thi Thuy , F. Islam , M.N.D. Abeykoon , T.H. Nguyen , Sumara Sadef , O. Mwai and M.N.M. Ibrahim
  The objective of this study was to characterize and describe native chicken populations in Bangladesh, Sri Lanka, Vietnam and Pakistan, in order to facilitate their rational development, utilization and conservation strategies. Results indicate modest variations in colours (plumage, earlobe and comb), comb types and orientation, head shape, feather patterns and shank and neck feathers, both among and within chicken breeds. Body live weights and measurements varied significantly (p<0.05) across countries. Body live weights were significantly different across countries, except between Bangladesh and Pakistan. Chicken breeds in Vietnam were significantly (p<0.05) heavier and bigger, while those in Bangladesh the smallest. Birds in Pakistan are small in size but have significantly large back lengths. Comparison within chicken breeds was conducted on the village chicken and crosses, naked neck and Vietnamese breeds. The mean body weight and other measurements varied significantly within the chicken breed groups. The mean values estimated for body weight and circumference in village chicken and crosses were significantly higher in Sri Lanka than in similar chicken breeds in Pakistan and Bangladesh. Average body weights for village chicken and crosses in the current study were 924±79.1, 1537±24.7 and 1069±24.7 g in Bangladesh, Sri Lanka and Pakistan, respectively. Among the Vietnamese chicken breeds, the Ho chicken was bigger and heavier than the rest of the breeds. The moderate variation in phenotypes among and within chicken breeds across the four study countries can be associated with geographical isolation and limited artificial selection pressure in situ.
  M. Ahemad and M.S. Khan
  This study examines the effect of four herbicides, quizalafop-p-ethyl, clodinafop, metribuzin and glyphosate, on plant growth promoting activities, like, phosphate solubilization, siderophores, indole acetic acid, exo-polysaccharides, hydrogen cyanide and ammonia production by herbicide tolerant Enterobacter asburiae strain PS2 isolated from mustard rhizosphere. The selected herbicides were applied at recommended, two and three times the recommended rates. The activities of E. asburiae strain PS2 observed under in vitro environment were persistent for all herbicides at lower rates which however, decreased regularly, but not lost completely, as the concentration of each herbicide was increased from lower to higher one. Herbicides at recommended dose had less inhibitory effect while the dose higher than the recommended one adversely affected the plant growth promoting traits of E. asburiae strain PS2. Among all herbicides, quizalafop-p-ethyl generally, showed maximum toxicity to plant growth promoting activities of this bacterium. The order of herbicide toxicity at highest dose rate for each herbicide was observed as quizalafop-p-ethyl>clodinafop>glyphosate>metribuzin for phosphate solubilizing potential; quizalafop-p-ethyl>glyphosate>clodinafop> metribuzin for salicylic acid synthesis; quizalafop-p-ethyl>clodinafop = glyphosate >metribuzin for 2, 3-dihydroxybenzoic acid and quizalafop-p-ethyl>clodinafop> glyphosate>metribuzin for indole acetic acid production. In contrast E. asburiae strain PS2 produced higher exo-polysaccharides on increasing concentration of each herbicide. At three times the recommended rate of each herbicide, the order of induction in exo-polysaccharides secretion by E. asburiae strain PS2 was found as clodinafop>quizalafop-p-ethyl>metribuzin>glyphosate. The herbicide tolerance together with growth promoting activities shown under herbicide stress suggests that E. asburiae strain PS2 could be used as inoculant for raising the productivity of crops even in soils poisoned with herbicides.
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