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C-14 Labeled Photosynthate Export from Fully Expanded Corn (Zea mays L.) Leaf Blades¹

The velocity and time course of C-14 labeled photosynthate export from corn leaves were studied at 15 days after silk emergence. The C-14 front moved at a velocity of ca. 138 cm/hr. The rate and completeness of C-14 export from corn leaves was similar to that reported for sugarcane, and more complete than for most species reported in the literature.

Key Words: Velocity • Time course • Vascular anatomy • Translocation

² Assistant Professor of Agronomy, University of Wisconsin. (Present address: DeKalb AgResearch, Inc., DeKalb, Illinois 601 15).

Received for publication October 31, 1969.