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Ilex crenata  Thunb. `Rotundifolia' split-root plants were grown for 3 weeks at root-zone temperatures of 30/30, 30/34, 30/38, 30/42, 34/34, 38/38 and 42/42. The 38 C root-zone temperature treatment was the upper threshold for a number of growth and physiological parameters. A portion of the root system grown at near optimum temperatures could compensate in terms of shoot growth for part of the root system exposed to supraoptimal root-zone temperatures up to the 38 C critical threshold. Higher root-zone temperatures did not affect photosynthetic rates or root:shoot ratios, but altered photosynthate partitioning to different stem and root sinks. Although no differences were found for total  14 C partitioned to the roots, partitioning of the  14 C into soluble and insoluble fractions and the magnitude of root respiration and exudation were influenced by treatment. Heating half of a root system at 38 C increased the amount of  14 C respired from the heated side and increased the total CO 2  respired from the non-heated (30 C) half. Exposure of both root halves to 42 C resulted in membrane damage which increased the leakage of  14 C photosynthates into the medium.

THE INFLUENCE OF SUPRAOPTIMAL ROOT-ZONE TEMPERATURES ON 14C PHOTOSYNTHATE PARTITIONING IN ILEX CRENATA THUNB. `ROTUNDIFOLIA'