Date of Award


Degree Type


Degree Name

Master of Science




Dr. Sheila Macfie

Second Advisor

Dr. Mark Bernards


Pairs of isolines of durum wheat (Triticum turgidum var durum) differ in the amount of cadmium translocated to aboveground tissues; in the field, the high isolines have twice the cadmium in leaves and grain when compared to the low isolines. The hypothesis that differential cadmium translocation is associated with differential production of organic acids was tested by measuring cadmium in tissues, cadmium partitioning within the root, and organic acids in tissues and root exudates. When grown in soil, no differences between high and low isolines were found. When grown in hydroponics, no differences in one pair (W9261-BG) were found. In the other pair (W9260-BC), the low isoline had half the cadmium in its shoot, increased cadmium in the root symplast and increased concentrations of fumaric, malic, oxalic and succinic acids compared to the high isoline. This suggests that reduced translocation to aboveground tissues was associated with increased chelation of cadmium in the root.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.