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Development and Growth Regulation

Asymmetric Distribution of Glucose and Indole-3-Acetyl-myo-Inositol in Geostimulated Zea mays Seedlings ¹

Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824-1312

Indole-3-acetyl-myo-inositol occurs in both the kernel and vegetative shoot of germinating Zea mays seedlings. The effect of a gravitational stimulus on the transport of [³H]-5-indole-3-acetyl-myo-inositol and [U-¹⁴C]-D-glucose from the kernel to the seedling shoot was studied. Both labeled glucose and labeled indole-3-acetyl-myo-inositol become asymmetrically distributed in the mesocotyl cortex of the shoot with more radioactivity occurring in the bottom half of a horizontally placed seedling. Asymmetric distribution of [³H]indole-3-acetic acid, derived from the applied [³H]indole-3-acetyl-myo-inositol, occurred more rapidly than distribution of total ³H-radioactivity. These findings demonstrate that the gravitational stimulus can induce an asymmetric distribution of substances being transported from kernel to shoot. They also indicate that, in addition to the transport asymmetry, gravity affects the steady state amount of indole-3-acetic acid derived from indole-3-acetyl-myo-inositol.

¹ Supported by grants to Professor Robert S. Bandurski from the Life Science Section of the Space Biology program (NASA-NAGW-97, ORD 25796) and the Metabolic Biology Section of the National Science Foundation, PCM 82-04017.

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