. Practical text-book of plant physiology. Plant physiology. MOVEMENT IN RESPONSE TO INJURIES 35 lieved are connected with the transmission of the effects of the stimulus. Such effects may be observed by wounding roots by incisions with a razor, and then fixing a half hour or hour later in a mixture of picric, acetic and sulphuric acid in water. The ob- jects are stained in toto and sectioned by the usual imbedding. 5 7 Fig. 18. Diagrammatic representation of the regions in which transmission of the primary (/) and secondary (II) effects of wound-stimuli take place in the roots of Allium cepa.
. Practical text-book of plant physiology. Plant physiology. MOVEMENT IN RESPONSE TO INJURIES 35 lieved are connected with the transmission of the effects of the stimulus. Such effects may be observed by wounding roots by incisions with a razor, and then fixing a half hour or hour later in a mixture of picric, acetic and sulphuric acid in water. The ob- jects are stained in toto and sectioned by the usual imbedding. 5 7 Fig. 18. Diagrammatic representation of the regions in which transmission of the primary (/) and secondary (II) effects of wound-stimuli take place in the roots of Allium cepa. Stimulus given at 5 and roots fixed 12 minutes later. 5 shows the re- gion affected in the inner periblem. 6, the region affected in cross-section through the point of incision. 7, the region affected as shown by a radial section through the point of incision. After Nemec. methods. Transmission of the traumatic impulse takes place as shown by these reactions most readily in the median and inner periblem. 51. Movements of Mimosa in Response to Injury. Secure a few well-grown specimens of Mimosa and place them in a room at 250 to 30" C. Snip off the terminal pair of pinnules with a sharp pair of scissors and note the reaction. Touch the tips of another leaflet with a lighted match or a heated rod. Cut a slit in the lower part of the stem of a specimen with expanded leaves taking care not to jar the plant. Compare the rate of transmis- sion with that shown in response to shock. Make a series of wounds to determine whether injury stimuli are cumulative in their effects. Note the exudation of water from the wounds. No definite purpose can be surmised for the reaction of Mimosa. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacDougal, Daniel Trembly, 1865-1958. New York [etc. ] Longmans, Green, and Co.
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