Summary
Using a bark abrasion technique, the influence of IAA upon patterns of sugar translocation in isolated stem segments of Willow (Salix viminalis L.) has been studied. IAA was found to exert a considerable influence over translocation in both a longidutinal and tangential direction. Studies on longitudinal movement have led to the postulation of two possible effects of IAA on this system. Firstly a stimulation of sugar loading from the storage parenchyma into the sieve elements as described by Lepp and Peel (1970), and secondly a direct effect upon, the longitudinal transport process. The situation with regard to the tangential transport system is not as clear in all its aspects, though once again it is postulated that IAA may have a direct effect upon the movement of sugars in the tangential transport system.
Similar content being viewed by others
References
Booth, A., Moorby, J., Davies, C. R., Jones, H., Wareing, P. E.: Effects of indolyl-3-acetic acid on the movement of nutrients within plants. Nature (Lond.) 194, 204–205 (1962).
Davies, C. R., Wareing, P. F.: Auxin-directed transport of radiophosphorus in plant stems. Planta (Berl.) 65, 139–156 (1965).
Hartt, C. E., Kortschak, H. P.: Sugar gradients and translocation of sucrose in detached blades of sugar can. Plant Physiol. 39, 460–474 (1964).
Hew, C. S., Nelson, C. D., Krotkov, G.: Hormonal control of translocation of photosynthetically assimilated 14C in young soybean plants. Amer, J., Bot., 54, 252–256 (1967).
Lepp, N. W., Peel, A. J.: Some effects of IAA and kinetin on the movement of sugars in the phloem of willow. Planta (Berl.) 90, 230–235 (1970).
Lepp, N. W., Peel, A. J. Patterns of translocation and metabolism of 14C IAA in the phloem of willow. Planta (Berl.) (in press).
Milthorpe, F. L., Moorby, J.: Vascular transport and its significance in plant growth. Ann. Rev. Plant Physiol. 20, 117–138 (1969).
Moorby, J.: The effects of growth substances on transport in plants. In: The Transport of Plant Hormones, p. 192–206. Amsterdam 1968.
Morris, D. A., Thomas, E. E.: Distribution of 14C labelled sucrose in seedlings of Pisum salivium (L). treated with IAA and Kinetin. Planta (Berl.) 83, 276–281 (1968).
Mullins, M. G.: Mechanism of hormone-directed transport of metabolites.—In C. S. I. R. O Division of Hort. Research report 32-33 (1967–69).
Peel, A. J.: Tangential movement of 14C-labelled assimilates in stems of willow. J. ex. Bot. 15, 104–113 (1964).
Seth, A., Wareing, P. F.: Hormone directed transport of metabolites and their possible role in plant senescence. J. exp. Bot. 18, 67–77 (1967).
Shiroya, M.: Comparison of upward and down ward translocation of 14C from a single leaf of sunflower. Plant Physiol. 43, 1605–1610 (1968).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lepp, N.W., Peel, A.J. Influence of IAA upon the longitudinal and tangential movement of labelled sugars in the phloem of Willow. Planta 97, 50–61 (1971). https://doi.org/10.1007/BF00388405
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00388405