The effect of abrupt temperature increase on phosphorus metabolism of Pisum sativum

Pea plants (Pisum sativum cv. Dark Skin Perfection) were grown in a controlled-environment at 25°C day and 15°C night temperature and were then transferred to various high temperature environments. These environments were 32°, 35° and 38°C day temperature with 22°, 25° and 28°C night temperatures respectively. Sample plants were taken at three weeks after planting before transfer to high temperature; and after 1, 10, 100, 1000 minutes and 6 days of exposure to high temperature. The sample plants were analysed for total, organic, inorganic and lipid phosphorus. Growth measurements were also taken. There were no significant changes in the concentrations of organic, lipid and total phosphorus and of inorganic phosphorus except at 6 days exposure to high temperature at which time there was a marked increase in the concentration of inorganic phosphorus. Transfer of plants from the cooler environment to the warmer environments, generally resulted in shorter internode lengths and overall shorter plant height.Land and Food Systems, Faculty ofGraduat