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Articles by Saghir Ahmed Sheikh
Total Records ( 5 ) for Saghir Ahmed Sheikh
  Mohammad Ibrahim Keerio , Saghir Ahmed Sheikh , Shanila Yasmeen Chang and Samiullah K. Agha
  The chlorophyll fluorescence has been widely used to study the activity of the photosynthetic machinery. The first trifoliate leaf was used to study the effects of high temperature on the leaves using chlorophyll fluorescence method (Fv/Fm ratio). No effects were found on the ratio when leaves were stressed for 2 to 4 h at 35° C. After 4 h stress at 40°C, however, there was an approximately 50% decrease in the Fv/Fm ratio. The Fv/Fm ratio was more severely affected by heat stress at 42.5° C, but effects were greater in cultivars Mago-80 and Bragg. At 45°C there were approximately 80% decreases in the Fv/Fm ratios in all cultivars.
  Saghir Ahmed Sheikh , Muhammad Ibrahim Keerio and Riasat Ali Kubar
  The result suggested that the fresh weights of the root tips decrease with increasing germination time at 25°C. The respiration rate decreases with increasing germination time and the pattern was very similarly in both quartiles. Waterlogging treatment showed large reductions on root growth and their fresh and dry weights. Waterlogging treatment of 12 h or more caused greater reductions in respiratory activities.
  Saghir Ahmed Sheikh , Muhammad Ibrahim Keerio , Maqsood Anwar Rustamani and Mohammad Ashraf Mirjat
  Fatty acid analysis in cotton seedlings following waterlogging showed changes in both their levels and relative composition. This treatment caused a marked increase in the amount of esterified fatty acids. Waterlogging also enhanced the synthesis of a set of low molecular weight compounds and suppressed the synthesis of all the “normal” fatty acids. A significant increase in free fatty acids was also observed.
  Saghir Ahmed Sheikh , Muhammad Ibrahim Keerio , Maqsood Anwar Rustamani and Noor-u-Nisa Memon
  The results of fatty acids analysis suggested that greater unsaturation occurred with increasing germination time. High temperature had a marked effect on fatty acid composition and caused significant changes especially in neutral lipid and glycollpid fatty acids. Small changes were also observed in phophollpid fatty acids. A large increase in free fatty acid was also found, since free fatty acids are known to be damaging to cells.
  Saghir Ahmed Sheikh , Muhammad Ibrahim Keerio , Riasat Ali Kubar and Noor-u-Nisa Memon
  The experiment was carried out to study the effect of temperature on (Me-14C) choline uptake in cotton roots and its incorporation into phosphatidylcholine. The results suggest that (Me-14C) uptake and incorporation increased with increased germination time. Temperature above 35C had significant effect on (Me-14C) choline uptake and incorporation. Thus, as the temperature increased above 35C, the rate of synthesis of phosphatidylcholine decreased. At 50C, however, more than 80% of the phosphatidylcholine synthesis was inhibited.
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