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Title: The movement and metabolism of 2,4-dichlorophenoxyacetic acid in root tissues of Pisum sativum L.
Author: Wilkins, Henry
ISNI:       0000 0001 3568 3217
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1973
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The movement of 2,4-dichlorophenotyacetic acid, labelled with ¹⁴C in the -COOH or the -GH₂ group of the acetic acid side chain, was monitored in subapical segments and intact roots of Pisum sativum maintained at 25°C ± 1°C in white light or total darkness. A strong acropetal polarisation of the movement of radioactivity was detected in root segments, together with a significant basipetal component of transport. Radioactivity applied to the apical end of the segments appeared to he retained mainly in the tissue adjacent to the donor block, whereas an application to the basal end resulted in a rapid distribution towards the receiving block. The polarity was not related to the ratio of the area of out surface at either end of the segments, indeed the greatest polarity occurred when the ends were of identical area. The polarity was related to orientation of the segments with respect to gravity and exposure of the segments to white light. Studies of the importance of several components of the experimental system on the movement of radioactivity, from the labelled herbicide, were made and revealed that the system was complex. Acropetal and basipetal movement of ¹⁴C in the phloem and xylem respectively, was recorded in intact Pisum seedlings roots but depended on the method of herbicide application. Degradation of the radioactive herbicide in root segments and roots was not significant and the ¹⁴C label appeared to be confined to the 2,4-D molecule.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available