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Articles by H. Rahman
Total Records ( 3 ) for H. Rahman
  H. Rahman , M.M. Alam and A.M. Akanda
  The diverse nature of shift in the amount of cellular nutritional elements and nucleic acids as affected by the infection of different isolates of Papaya Ring Spot Virus-Papaya strain (PRSV-P) was studied in this experimentation. The symptomatic isolates used in the present study were mild mosaic, mosaic, fern leaf, severe mosaic, vein clearing, leaf distortion and chlorotic leaf spot. Parameters measured to quantify the alteration of cellular components comprised different nutritional cellular elements (C, N, P and K) and nucleic acids (DNA and RNA). In all occasion of measured parameter, the highest alteration was found in leaf distortion. Almost in all cases the lowest effect was determined with the Mild Mosaic infected plants followed by the mosaic, severe mosaic, vein clearing, chlorotic leaf spot, fern leaf and leaf distortion. Infection of seven different symptomatic isolates of PRSV-P created striking and responsive variability in all parameters studied. And the dependency of the cellular nutritional elements and nucleic acid on seven symptomatic variants of PRSV-P was found significantly correlated in respect to the corresponding yield.
  H. Rahman , M.M. Alam , S.B. Bhyan and A.M. Akanda
  The study was conducted to elucidate the diverse change in the amount of cellular pigment contents of papaya leaves infected with different biological variants of Papaya ring spot virus-Papaya strain (PRSV-P). Among the naturally prevailing PRSV-P strains in Bangladesh 7 different and distinctly defined ailments of symptoms, namely Mild mosaic, mosaic, fern leaf, severe mosaic, vein clearing, leaf distortion and chlorotic leaf spot has been selected to conduct the tests of this experimentation. Different partition of cellular pigments (Chlorophyll-a, Chlorophyll-b and ß-carotene) were measured to quantify the alteration of cellular components. For every partition of pigments tested, the highest alteration was found in leaf bearing leaf distortion symptom. In most of the cases the lowest shift in pigment content was determined with the leaf showing Mild Mosaic symptom followed by the mosaic, severe mosaic, vein clearing, chlorotic leaf spot, fern leaf and leaf distortion symptom, respectively. The variability in all the partition of pigments contents alteration was found to be consistently correlated with 7 symptomatic variants of PRSV-P.
  A. K. M. Saleh , M. A. Latif , M. A. I. Khan , H. Rahman and M.K. Uddin
  Seven fungal genera namely Alternaria, Fusarium, Aspergillus, Penicillium, Rhizopus, Chaetomium and Curvularia, were found to be associated with seeds of 4 districts (Narsingdi, Munshiganj, Manikganj and Mymensingh) of Dhaka Division. Percent incidence of different fungi varied with locations and duration of storage period. The highest seed-borne infection of Alternaria was detected at Narshigdi (10.32%), followed by Munshiganj (10.06%), Manikganj (8.66%) and Mymensingh (6.03%). The frequency of Alternaria decreased with the increasing of storage period but Fusarium and Aspergillus increased with the increasing of storage period. Germination of mustard seeds ranged from 57.29 to 77.75% in respect of locations and duration of storage period. Percent germination decreased with increasing of the duration of storage period. Five selected fungicides were tested against Alternaria. Among the fungicides Rovral was found to be the best followed by Panoctine, Lirotect, Topsin M and Cupravit. All the fungicides at the @ 0.25 and 0.50% seed weight increased germination significantly from 5 to 13% over control treatment. But only Rovral increased germination from 11 to 13% at both concentrations.
 
 
 
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