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Articles by Shanila Yasmeen Chang
Total Records ( 2 ) for Shanila Yasmeen Chang
  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.
  Mohammad Ibrahim Keerio , Mohammad Ashraf Mirjat , Shanila Yasmeen Chang and Irfana Parveen Bhatti
  Heat-hardening treatments indicates that B.rhizobium japonicum can grow better at high temperatures. During first 12h of incubation (after hardening at 40°C) the rhizobia sometimes grew less well than the controls, but growth then increased more quickly up to 36h of incubation compared to controls. A small decrease in cell population was measured after 48h, however, similar to that in the control. At 45°C, the heat-hardened rhizobia grew similar to the controls during the first 12h, then a sharp increase was found after 36h. Growth was then much better in the hardened cultures than controls. Same time at 40°C, the pH declined sharply after 12h and remained stable on further incubation. However, the pH of the culture which was incubated at 45°C did not decline during the first 24h of incubation and only a very slow decline was found after that. Similar results were found in the cultures which had been hardened at 45°C. In cultures which were incubated at 40°C, the pH decreased slightly after 12h of incubation and became stable on further incubation. At 45°C, decrease in the pH was not found up to 24h and then a small decline take place with increasing incubation periods.
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