The influence of bentazone on stomatal movement

Nichols, K.J., 1988. The influence of bentazone on stomatal movement. PhD, Nottingham Trent University.

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The herbicide, bentazone, was shown to alter stomatal movement in abaxial epidermal peels of several plant species. It was shown to have the ability to both enhance and depress stomatal movement, which appeared to be dependent on potassium concentration.

The plant species chosen for the major part of this investigation was Commelina communis L. and the stomatal responses in this species were characterised with respect to bentazone concentration, potassium concentration, light, darkness and pH. The effect of the non-toxic bentazone derivative 6-hydroxybentazone on stomata was also observed and showed that this small change in the molecule altered the activity sufficiently to prevent enhancement of stomatal opening.

A comparison was made between the effect of bentazone and IAA on stomatal movement. Both molecules were shown to be most active at pH 4 and an interaction was apparent, with respect to stomatal aperture, when the chemicals were applied together. Both bentazone and IAA were shown to be able to change the specific activity of malate dehydrogenase in abaxial epidermes. However, it was not clear whether these alterations were due to alteration of the ionic balance in the guard cells or direct action on the enzyme itself. Studies using the radioisotope 86Rb, as a substitute for potassium, and some metabolic inhibitors suggested that bentazone and IAA were capable of altering potassium uptake and retention and that this may involve ATPase activity. Comparisons are made between the activities of bentazone and IAA and possible mechanisms of action are discussed.

Item Type: Thesis
Creators: Nichols, K.J.
Date: 1988
ISBN: 9781369324327
Rights: This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without the author's prior written consent.
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 11 Nov 2020 15:31
Last Modified: 11 Oct 2023 10:17

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