The Effect of Temperature upon Translocation of C14 in Sugarcane

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Abstract
The effects of air and root temperatures, regulated separately, were studied with entire plants. The objectives were practical, to aid in understanding other results, and to attempt to obtain a hint as to the mechanism of translocation. Tests with detached blades were undertaken to study the direct effect of temperature on translocation, distinct from growth effects. Such tests might lead to a method of selecting varieties suited for various temperature ranges. Air temperature directly affected the percentage and velocity of translocation and profile development. Temperature coefficients, calculated from the data on percentage of translocation, were from the fed blade (Q10 = 1.1-1.5); down the stem (Q10 = 1.05-1.7); up the stem (Q10 = 3.9-16.2). These data indicate that translocation from the leaf and down the stem involves physical or physico-chemical processes, whereas translocation up the stem is controlled by chemical processes, e.g., the metabolism of cell growth. Cold roots decreased translocation from the leaf only at high light intensities when the plants at low root temperature were under greater moisture stress than the plants at normal root temperature. In detached blades tested at 250 ft-c, there was no translocation at 5[degree] C and definite translocation at 22[degree] C.