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Short‐term responses of phloem transport to mechanical perturbation
Author(s) -
Jaeger C. H.,
Goeschl J. D.,
Magnuson C. E.,
Fares Y.,
Strain B. R.
Publication year - 1988
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1988.tb09169.x
Subject(s) - phloem , seedling , phaseolus , botany , horticulture , chemistry , biophysics , biology
Jaeger, C. H., Goeschl, J. D., Magnuson, C. E., Fares, Y. and Strain, B. R. 1988. Short‐term responses of phloem transport to mechanical perturbation. ‐ Physiol. Plant. 72: 588–594. Phloem transport was monitored using a continuous stream of 11 CO 2 ‐labelled air administered to one leaf while gamma detectors measured 11 C activity at intervals along the stem. The effect of gentle, non‐injurious mechanical perturbation on phloem transport was tested in cotton ( Gossypium hirsutum L. cv. Stoneville 213). Mechanical stimuli such as shaking, localized vibration and gentle massage were applied while the plants were at isotope equilibrium. Localized phloem blockages were observed within 1–2 min of the stimuli. The blockages lasted from 6–55 min and full recovery of transport required 20–175 min. The effect of preconditioning to mechanical perturbation on phloem transport was tested in bush beans ( Phaseolus vulgaris L. cv. Cherokee Bush). Preconditioning of a bean seedling to gentle stem massage resulted in a shorter blockage response and quicker transport recovery period when the seedling was massaged during a 11 C tracer experiment compared to a control seedling. These results indicate that measurements of phloem transport on recently disturbed plants will probably show depressed phloem transport velocities. Measurements should be made after at least a 24‐h disturbance‐free recovery period.