Date of Award:


Document Type:


Degree Name:

Master of Science (MS)



Committee Chair(s)

Gene W. Miller


Gene W. Miller


David R. Walker


There are many reports relating the effects of fluorides on plant respiration. Fluoride has been regarded as an inhibitor of respiration. Warburg et al. (1942) demonstrated that fluoride inhibited enolase activity, therefore, decreased the respiration rate of yeast, Miller (1958), found a similar inhibition of enolase from pea seed. Bonner (1948), Bonner and Wildman (1946), and Laties (1949) reported that the fluoride ion in culture solutions reduced the respiration rate in Avena Coleoptile, spinach leaves and barley roots. Since the inhibition was reversed by the addition of pyruvate, they concluded that the inhibition of respiration was due to the inactivation of fluoride sensitive enolase. Chung and Nickerson (1954) studied yeast cells grown in presence of fluoride and concluded that the inhibition of growth was due to the inhibition of polysaccharide synthesis, and the site of inhibition was the enzyme phosphoglucomutase. Yang and Miller (1963) found divergent sucrose, reducing sugar contents in fluoride fumigated soybean leaves and concluded that the enzyme phophoglucomutase was the site of fluoride inhibition in sucrose synthesis. Phosphorylase (Rapp and Sliwinski, 1956), phosphatase (Lammer and Hafer, 1953; Pierpoint, 1957) and hexokinase (Melchior and Melchior, 1956) have also been reported to be fluoride sensitive in vitro.