THE EFFECTS OF PICLORAM AND 2,4-D ON PLANT CELL MEMBRANES |
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| Authors: | E P Bachelard R D Ayling |
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| Institution: | Department of Forestry, Australian National University, Canberra, A.C.T. |
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| Abstract: | Summary. The herbicide Tordon 50D (picloram + 2,4–D) caused severe shrinkage of the protoplasts of all cells of Pinus radiata needle segments within 24 h of treatment. Measurements of the resistance of these tissues to low-frequency and to high-frequency electrical currents showed a loss in the integrity of the plasmalemma within 4–8 h of treatment. Tordon 22K (picloram) had no such effects. The results with Tordon 50D could be attributed solely to the 2,4-D content.
Both Tordon 50D and Tordon 22K disrupted chloroplast structure in leaf discs, and the integrity of cell membranes in stem tips, of Eucalyptus viminalis. |
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