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Articles by M. S. Davies
Total Records ( 5 ) for M. S. Davies
  M. Hanif and M. S. Davies
  Eight day exposure to NaCI reduced the Mitotic indices in the root meristems of all the cultivars in aerated solution culture. There were large differences between the cuitivars in the control solutions. The relative frequency of prophase and metaphase in Mitotic cells decreased with increasing NaCI concentration while the relative frequency of anaphase and telophase increased. Mitotic index in the root meristem of Chinese spring was reduced to a greater extent than in K: cultivar.
  M. Hanif and M. S. Davies
  The seedlings of Triticum aestivum cvs. Lyallpur 73 and Lu-26-S were grown in aerated 0.1 Rorison nutrient solution for 72 hours. Then the kinetics of cells cycle in the root meristem were determined by a pulse labelling experiment with low specific activity tritiated thymidine following a 70 hours exposures to three concentrations of NaCl (0, 30, 70 mM NaCl). Treatments with 30 and 70 mM NaCl increased the length of cell cycle in cv Lu-26-S but that of Lyallpur 73 was decreased. The growth fraction (refers to percentage of meristematic cells which are actively cycling as opposed to these that are not cycling in the meristem) was increased in Lyallpur 73 from 7.9 to 11.11% over the range of 0-70 mM NaCl whereas that of Lu-26-S was decreased in response to increasing NaCl concentration.
  M. Hanif and M. S. Davies
  This study was to compare the relative salt tolerance of differentially salt-tolerant cultivars of wheat, rye and barley grown at varying concentrations of NaCl in solution culture during germination. Increasing concentration of NaCl (60-150 mM) reduced the percentage of seed germinating. The lines of Hordeum sativum were generally less sensitive to the NaCl-induced reduction in respect of the character than Triticum aestivum or Secale cereale. Germination is not a good discriminating character for salt tolerance in this study.
  M. Hanif and M. S. Davies
  The Pakistan wheat cultivars investigated exhibited different cell doubling times not only at the control but they also differed in response to increasing the NaCl concentration. The rates of metaphase accumulation of the cultivars were very slow and thus cell doubling times were very long. This may be a reflection of very slow mitotic activity in root meristems.
  M. Hanif and M. S. Davies
  The seeds of Hordeum sativum lines B-88079 and B-jou87 were grown in aerated 0.1 Rorison nutrient solution for 72 hours. Then the kinetics of cell cycle in the root meristem were determined by a pulse labelling experiment with low specific activity tritiated thymidine following a 70 hours exposures to three concentrations of NaCI (0, 50 and 100 mM NaCI). Hordeum sativum lines B-jou87 had a longer cell cycle duration than that of line B-88079. The mitotic cell cycle in line B-88079 remained unaffected at 50 and 100 mM NaCI concentrations but that of B-jou87 was decreased. The growth fraction (refers to percentage of meristematic cells which are actively cycling as opposed to these that are not cycling in the meristem) was not determined due to non labelling of any cells in continuos labelling experiment.
 
 
 
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