The Elongation Rate of Wheat Leaves

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Abstract
A measuring device is described with which it is possible to record the elongation rate (in mm h-1) of monocotyledonous leaves during the whole growing period. By means of inductive displacement transducers connected to a computer, the elongation rate is determined every 10 min during day and night for 3–8 d. A time period of 30 min proved to be suitable for calculating the elongation rate at any given moment. Shorter periods emphasize the experimental error and longer time periods tend to conceal sudden changes in the elongation rate. Elongation rate curves of wheat leaves are presented. They revealed that the elongation rate. Elongation rate curves of wheat leaves are presented. They revealed that the elongation rates during the night period were significantly lower than during the day (approximately 60–70% of the rates by day). This reduction is not caused by a reduction of the plant temperature. If the night period was extended, the elongation rate decreased almost to zero after 14 h darkness. The length of this dark period until decrease begins was dependent on the previous day's light intensity. The elongation rates of the 3rd wheat leaf under the given conditions were for 5 d about 3 mm h-1, and during the nights about 2 mm h-1. During the 7th day, the elongation rate decreased and remained zero from the 8th day onwards.

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