Publication Date


Advisor(s) - Committee Chair

Frank Toman, Gary Dillard, Kenneth Nicely

Degree Program

Department of Biology

Degree Type

Master of Science


The short term effects of high manganese levels (80 mg/L) on wheat and tobacco isocitrate dehydrogenase (IDH) activity were compared. The change in activity was then compared to the concentrations of manganese in the tissues.

As the time of manganese exposure increased, the fresh weight IDH activities in wheat and tobacco decreased. In contrast both control groups had similar enzyme activities every 6 hr over the 24 hr test period. The decrease in IDH activity of wheat and tobacco plants in experimental groups seemed to be related to an increase of the manganese in the leaf tissue. The slower decrease in the IDH activity of wheat and the faster decrease in the IDH activity of tobacco appeared to correspond to manganese levels in the respective tissues. It appears that wheat is able to tolerate the higher manganese concentration in the growth media better than tobacco.


Agronomy and Crop Sciences | Biology | Life Sciences | Plant Sciences