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Articles by M.M. Begum
Total Records ( 4 ) for M.M. Begum
  M.A. Rahman , J. Kadir , T.M.M. Mahmud , R. Abdul Rahman and M.M. Begum
  Of the 27 antagonistic bacteria isolated from the fructosphere of papaya and screened by dual and concomitant test, four isolates of bacteria (B23, B19, B04 and B15) had high antagonistic activities against Colletotrichum gloeosporioides of papaya. Using the Biolog system, isolates B23 and B19 were identified as Burkholderia cepacia and B04 and B15 as Pseudomonas aeruginosa. Both B. cepacia and P. aeruginosa strongly inhibited the fungal growth by an average of 74.13 and 68.45%, respectively during in vitro screening on PDA medium. The bacteria also produced volatile as well as diffusible substances. Malformation of hyphae occurred in the presence of both bacteria. Hyphae were thickened, vacuolar and many swellings occurred in them or at the tips of hyphal strand. However, B. cepacia was found most efficacious biocontrol agent in this study. Total inhibition (100%) in spore germination was noted in presence of B. cepacia at 24 h after treatment. Filter sterilized culture filtrate of B. cepacia also significantly inhibited the mycelial growth (59.2%) and spore germination (100%) of the test fungus, thus suggesting that an antibiotic substance (s) may be produced by the bacterium. Therefore, in vitro activities of the B. cepacia against C. gloeosporioides of papaya in this study suggested that the bacterium can be an effective biological control agent.
  M.M. Begum , M. Sariah , A.B. Puteh and M.A. Zainal Abidin
  A study on seed-borne infections of soybean [Glycine max (L.) Merrill] demonstrated the infectivity of 17 fungal species belonging to 11 genera using blotter and potato dextrose agar methods. Among them Colletotrichum truncatum, Diaporthe phaseolorum var. sojae and Fusarium oxysporum f. sp. glycines were found in higher frequencies and well established within and on the external surfaces of seeds. Histopathology of C. truncatum infection in seeds of soybean was examined under Light Microscopy (LM) and Scanning Electron Microscopy (SEM). No mycelium and acervulus were observed in any tissues of asymptomatic (healthy) seeds. Seeds colonized with C. truncatum produced irregular gray spots with black specks. C. truncatum produced compact dark mycelium both intra- and intercellularly in the seed coat, cotyledon and embryo. Mycelial growth was more abundant in the hourglass layer of the seed coat and hypodermis, where large inter-cellular spaces were present. Acervuli with setae and abundant hyaline sickle-shaped conidial masses were observed abundantly on the surface of infected seeds. Similar observations were found beneath the inner layers of the seed coat and upper surfaces of embryo and cotyledonary tissues. Brown conidial masses were produced during incubation and liberated in the form of ooze resulting in maceration and disintegration of the parenchyma tissues of the seed coat, cotyledon and embryo.
  Md. Kalim Uddin , K.M. Khalequzzaman , M.A. Rahman , M.M. Begum and M. Zibon Nessa
  Seven different fertilizer combinations on cropping system basis were studied to develop a fertilizer package for mustard-boro rice-transplant aman rice cropping system. Significantly higher grain yield of mustard, boro rice and transplant aman rice were obtained when the recommended rate of fertilizer was applied. When P or K was not applied in boro rice after full NPKS application in the preceding mustard, gave similar yield to when received its recommended dose but when P or K was not applied for two consecutive boro (spring rice) and transplant aman rice (monsoon rice) it significantly reduced the transplant aman rice yield indicating that P or K had residual effect up to one succeeding crop. On the other hand, transplant aman need an extra application of both P and K fertilizer. Sulfur had a residual effect up to two succeeding crops if applied in full dose along with NPK in the preceding mustard. After application of full recommended dose of NPKS in the preceding mustard, a reduced (50%) dose of P + K along with a full N in the succeeding boro and transplant aman rice gave a similar yield to when recommended NPKS or NPK was used. To maintain soil fertility and to sustain crop yield this fertilizer practice may be considered as a good alternative compared to recommended fertilizer dose.
  M.M. Begum , M. Sariah , M.A. Zainal Abidin , A.B. Puteh and M.A. Rahman
  Histopathological studies on natural infections by Fusarium oxysporum f. sp. glycines in soybean seeds were conducted using Light Microscopy (LM) and Scanning Electron Microscopy (SEM). Asymptomatic (healthy) seeds were found free from pathogens. Infected seeds were slightly irregular in shape and appeared whitish moldy. The fungus mycelia colonized the external surface and inner tissues of the seed coat, but not in cotyledon or in embryo. Upper surfaces of seeds showed profuse colonization by mycelia and seed coat tissues became ruptured and distorted in the severely infected seeds. Vigorous mycelial growth was found in the hourglass layer of the seed coat. Effect of artificial inoculation on soybean seed germination and seedling survivability under glasshouse conditions was also studies. F. oxysporum f. sp. glycines reduced seed germination and seedling survivability by 40% and caused pre-emergence damping off of seedlings. Trichoderma harzianum isolate UPM40 and Pseudomonas aeruginosa isolate UPM13B8 were most effective candidates in inhibiting the mycelial growth of F. oxysporum f. sp. glycines in vitro.
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