Type of Document Dissertation Author Abdaoui, Fatima El URN etd-10132005-152523 Title Allelopathic effects of ferulic, gallic, and vanillic acids on corn (Zea mays L.) Degree PhD Department Plant Physiology and Weed Science Advisory Committee
Advisor Name Title Hagood, Edward Scott Jr. Committee Chair Derr, Jeffrey F. Committee Member Hatzios, Kriton K. Committee Member Parrish, David J. Committee Member White, Robert H. Committee Member Keywords
- Germination Research
Date of Defense 1991-01-03 Availability restricted AbstractStudies on the activity of femlic, gallic, and vanillic acids on germination
and growth of corn (Zea mays L.), radish (Raphanus sativus L.), and peanut
(Arachis hypogaea L.) showed that the inhibitory effects of these acids were
concentration and growth variable dependent. Ten days after treatment,
significant reduction in percent germination of the three species occurred with
higher phenolic acid treatments, except that gallic acid did not significantly inhibit
peanut germination. Among the growth parameters investigated, root elongation
and dry weight were more affected than either germination or shoot length and
dry weight. Radish and corn were more sensitive than peanut.
In two-combination experiments, the interactive effects of phenolic acids on
corn germination and shoot growth were generally not significant, indicating an
additive effect. Femlic acid, generally, antagonized higher concentrations of
vanillic or gallic acids on corn root length and dry weight, suggesting a differential
uptake of phenolic acids by corn roots or a limited uptake of gallic and vanillic
acids in the presence of ferulic acid. In a soil system, higher and repeated
phenolic acid treatments were required to bring about inhibition of corn growth
than those which were effective in petri dishes.
All levels of the synthetic auxin, 2,4-D (2,4-dichlorophenoxyacetic acid) were
effective in reversing the inhibitory effects of 1 mM ferulic acid on corn root
length when these two acids were applied in combination. No 2,4-D treatment
counteracted 10 mM of ferulic acid. All levels of 2,4-D combined with 1 mM
ferulic acid and the mixture of 0.1 nM 2,4-D with 10 mM ferulic acid were
antagonistic for corn shoot length. No significant interactions were obtained on
corn germination or seedling growth when 2,4-D was combined with gallic acid.
Using manometric techniques, no inhibitory effects of ferulic or gallic acids
observed on 02 consumption of germinating corn seeds. Ferulic acid did not
interfere with water uptake of corn seeds during imbibition and germination.
These findings indicate that the phytotoxicity of these acids observed on corn
germination and seedling growth are not due to their interference with water
uptake and respiratory activity of germinating seeds.
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