Summary
Localized cooling of a 2 cm length of the leaf blade of the grass Lolium temulentum to 0° C, had only a small effect on the mass transfer of assimilates from the distal part of the leaf. There was no evidence of a reduction in the velocity of movement of 14C-labelled assimilates through the low temperature zone, and the retention of assimilates along the pathway of movement was reduced by low temperature. In contrast to the longitudinal movement, lateral movement of 14C, induced by steam killing sections of the leaf, was extremely sensitive to temperature and showed no sign of acclimatization, even after 3 days at low temperature. These results suggest that, although loading sugars into the transport system was sensitive to temperature, the movement of assimilates was not directly controlled by metabolic processes along the pathway.
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References
Böhning, R. H., Kendall, W. A., Linck, A. J.: Effect of temperature and sucrose on growth and translocation in tomato. Amer. J. Bot. 40, 150–153 (1953).
Bowling, D. J. F.: Translocation at 0° C in Helianthus annus. J. exp. Bot. 19, 381–388 (1968).
Canny, M. J.: The rate of translocation. Biol. Rev. 35, 507–532 (1960).
Canny, M. J., Phillips, O. M.: Quantitative aspects of a theory of translocation. Ann. Bot. 27, 379–402 (1963).
Coulson, C. L., Peel, A. J.: The effect of temperature on the respiration of 14C-labelled sugars in stems of willow. Ann. Bot. 35, 9–15 (1971).
Duloy, M. D., Mercer, F. V.: Studies in translocation. I. The respiration of the phloem. Aust. J. biol. Sci. 14, 391–401 (1961).
Duloy, M. D., Mercer, F. V., Rathgeber, N.: Studies in translocation. III. The cytophysiology of phloem of Cucurbita pepo. Aust. J. biol. Sci. 15, 459–467 (1962).
Evans, L. T., Wardlaw, I. F.: Independent translocation of 14C-labelled assimilates and of the floral stimulus in Lolium temulentum. Planta (Berl.) 68, 310–326 (1966).
Ford, J., Peel, A. J.: The contributory length of sieve tubes in isolated segments of willow, and the effect on it of low temperatures. J. exp. Bot. 17, 522–533 (1966).
Ford, J., Peel, A. J.: Preliminary experiments on the effect of temperature on the movement of 14C-labelled assimilates through the phloem of willow. J. exp. Bot. 18, 406–415 (1967).
Geiger, D. R.: Chilling and translocation inhibition. Ohio J. Sci. 69, 356–366 (1969).
Geiger, D. R., Sovonick, S. A.: Temporary inhibition of translocation velocity and mass transfer rate by petiole cooling. Plant Physiol. 46, 847–849 (1970).
Harel, S., Reinhold, L.: The effect of 2,4-dinitrophenol on translocation in the phloem. Physiol. Plant. 19, 634–643 (1966).
Morse, R. N., Evans, L. T.: Design and development of CERES—an Australian phytotron. J. Agric. Engng. Res. 7, 128–140 (1962).
Swanson, C. A., Böhning, R. H.: The effect of petiole temperature on the translocation of carbohydrate from bean leaves. Plant Physiol. 26, 557–564 (1951).
Swanson, C. A., Geiger, D. R.: Time course of low temperature inhibition of sucrose translocation in sugar beets. Plant Physiol. 42, 751–756 (1967).
Thrower, S. L.: Translocation of labelled assimilates in the soybean. IV. Some effects of low temperature on translocation. Aust. J. biol. Sci. 18, 449–461 (1965).
Van den Honert, T. H.: On the mechanism of the transport of organic materials in plants. Ned. Akad. Wet. Verhand. 35, 1104–1112 (1932).
Wardlaw, I. F.: The velocity and pattern of assimilate translocation in wheat plants during grain development. Aust. J. biol. Sci. 18, 269–281 (1965).
Wardlaw, I. F.: The effect of water stress on translocation in relation to photosynthesis and growth. II. Effect during leaf development in Lolium temulentum L. Aust. J. biol. Sci. 22, 1–16 (1969).
Weatherley, P. E.: Studies on the water relations of the cotton plant. I. Field measurement of water deficit in leaves. New Phytol. 49, 81–97 (1950).
Weatherley, P. E., Watson, B. T.: Some low-temperature effects on sieve tube translocation in Salix viminalis. Ann. Bot. 33, 845–853 (1969).
Webb, J. A.: Translocation of sugars in Cucurbita melopepo. IV. Effects of temperature change. Plant Physiol. 42, 881–885 (1967).
Webb, J. A.: Translocation of sugars in Cucurbita melopepo. VI. The reversible low temperature inhibition of 14C movement and cold acclimation of phloem tissue. Canad. J. Bot. 49, 717–733 (1971).
Webb, J. A., Gorham, P. R.: The effect of node temperature on assimilation and translocation of C14 in the squash. Canad. J. Bot. 43, 1009–1020 (1965).
Zimmermann, M. H.: Transport in the phloem. Ann. Rev. Plant Physiol. 11, 167–190 (1960).
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Wardlaw, I.F. Temperature and the translocation of photosynthate through the leaf of Lolium temulentum . Planta 104, 18–34 (1972). https://doi.org/10.1007/BF00387681
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DOI: https://doi.org/10.1007/BF00387681