Abstract
Seasonal variations in sieve-tube sap were followed by collecting exudate from the broken stylets of an armored scale insect (Quadraspidiotus ostreaformis Curtis) which overwintered on 3- to 6-year-old branches of a local willow population (Salix exigua Nutt.). During the winter, the scale insects fed on functional sieve tubes near the cambium. Broken stylets on stem segments taken to the laboratory exuded promptly even when collections were made at temperatures as low as-30°C. Exudation in the field was observed at-11 to-13°C. Sucrose accounted for virtually all of the sugars in exudate collected during the winter. Sieve-tube sap collected during the winter was about twice as concentrated as summer sievetube sap. The concentration decreased during rapid vegetative growth in the spring, and increased again as growth slowed in late summer and early fall.
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Abbreviations
- mOsmol:
-
milliosmolar
References
Aronoff, S. (1956) Techniques of radiobiochemistry. Iowa State Univ. Press, Ames, USA
Esau, K. (1969) The phloem. Gebrüder Borntraeger, Berlin Stuttgart
Eschrich, W., Currier, H.B. (1964) Identification of callose by its diachrome and fluorochrome reactions. Stain Technol. 39, 303–307
Evert, R.F., Kozlowski, T.T., Davis, J.D. (1972) Influence of phloem blockage on cambial growth of sugar maple. Am. J. Bot. 59, 632–641
Geiger, D.R., Sovonick, S.A. (1975) Effects of temperature, anoxia and other metabolic inhibitors on translocation. In: Encyclopedia of plant physiology, N.S., vol. 1: Transport in plants I, Phloem transport, pp. 256–286, Zimmermann, M.H., Milburn, J.A., eds. Springer, Berlin Heidelberg New York
Giaquinta, R.T. (1983) Phloem loading of sucrose. Annu. Rev. Plant Physiol. 34, 347–387
Hill, G.P. (1962) Exudation from aphid stylets during the period from dormancy to bud break in Tilia americana (L.). J. Exp. Bot. 13, 144–151
Lawton, J.R. (1976) Seasonal variation in the secondary phloem from the main trunks of willow and sycamore trees. New Phytol. 77, 761–771
Loescher, W.H., Marlow, G.C., Kennedy, R.A. (1982) Sorbitol metabolism and source-sink interconversions in developing apple leaves. Plant Physiol. 70, 335–339
Sauter, J.J. (1980) Seasonal variation in the sucrose content of Salix. Z. Pflanzenphysiol. 98, 377–381
Sovonick-Dunford, S., Ferrier, J., Dainty, J. (1982) Water-relations parameters of the phloem. Determinations of volumetric elastic modulus and membrane conductivity using a applied force method and shrinking and swelling of tissues in solutions at differing osmotic pressure. J. Exp. Bot. 10, 1–16
Tucker, C.M., Evert, R.F. (1969) Seasonal development of the secondary phloem in Acer negundo. Am. J. Bot. 56, 275–284
Weatherley, P.E., Peel, A.J., Hill, G.P. (1959) The physiology of the sieve tube. Preliminary experiments using aphid mouth parts. J. Exp. Bot. 10, 1–16
Weatherly, P.E., Watson, B.T. (1969) Some low-temperature effects on sieve tube translocation in Salix viminalis. Ann. Bot. 33, 845–853
Wright, J.P., Fisher, D.B. (1983) Estimation of the volumetric elastic modulus and membrane hydraulic conductivity of willow sieve tubes. Plant Physiol in press
Yust, H.R., Fulton, R.A. (1943) An exudation associated with the feeding location of the California red scale. J. Econ. Entomol. 36, 346–347
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Fisher, D.B. Year-round collection of willow sieve-tube exudate. Planta 159, 529–533 (1983). https://doi.org/10.1007/BF00409142
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DOI: https://doi.org/10.1007/BF00409142