Mohammad Ibrahim Keerio
Department of Plant Physiology and Biochemistry, Faculty of Crop Production, Sindh Agricultural University, Tandojam, Pakistan
Mohammad Ashraf Mirjat
Department of Plant Physiology and Biochemistry, Faculty of Crop Production, Sindh Agricultural University, Tandojam, Pakistan
Shanila Yasmeen Chang
Department of Plant Physiology and Biochemistry, Faculty of Crop Production, Sindh Agricultural University, Tandojam, Pakistan
Irfana Parveen Bhatti
Department of Plant Physiology and Biochemistry, Faculty of Crop Production, Sindh Agricultural University, Tandojam, Pakistan
ABSTRACT
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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How to cite this article
Mohammad Ibrahim Keerio, Mohammad Ashraf Mirjat, Shanila Yasmeen Chang and Irfana Parveen Bhatti, 2001. Growth
Response of Bradyrhizobium japonicum RCR3407 to Heat Hardening
Treatments. Journal of Biological Sciences, 1: 877-879.
DOI: 10.3923/jbs.2001.877.879
URL: https://scialert.net/abstract/?doi=jbs.2001.877.879
DOI: 10.3923/jbs.2001.877.879
URL: https://scialert.net/abstract/?doi=jbs.2001.877.879
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