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Abstract
Dry or humid night conditions were imposed to determine the distribution of calcium (Ca) and sap flow in tomato (Lycopersicon esculentum Mill.) plants. Radioisotopic 45Ca was fed to assess the Ca distribution in a tomato plant treated with different night humidities on different branches. The amount of sap transported from root to shoot was measured by a heat‐balance sap‐flow gauge. More than 95% of the sap was transported to the shoots during the daytime for 12 hours, while only negligible amount were transported at night. High nigh‐time humidity considerably enhanced sap flow during the night due presumably to generated root pressure. However, high night‐time humidity reduced the distribution of 45Ca compared to low night‐time humidity imposed in tomato branches.
Notes
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