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Movement of ¹⁴C-Labeled Assimilates into Kernels of Zea mays L

II. Invertase Activity of the Pedicel and Placento-Chalazal Tissues ¹

C. T. Dougherty^b,3

^a Plant Science Research Division, Agricultural Research Service, United States Department of Agriculture and Department of Agronomy, Purdue University, Lafayette, Indiana 47907, Department of Agronomy, Purdue University, Lafayette, Indiana 47907

Invertases of the placento-chalazal and pedicel tissues are much more active than invertase from the pericarp of Zea mays L. kernels 12 to 40 days after pollination. Sucrose synthetase was not detected in the pedicel or placento-chalazal tissues. Sucrose content and percentage increased in the pedicel with advancing kernel age. Hexoses accounted for over half of the sugars extracted from the placento-chalazal tissues. These data are consistent with the hypothesis that sucrose translocated to the pedicel is hydrolyzed by acid invertase(s) prior to entry of sugar into the endosperm tissue. The placentochalazal tissue appears to be the primary site of sucrose inversion with the pedicel invertase contributing more or less to this process depending on kernel age.

³ Present address: Plant Science Department, Lincoln College, Canterbury, New Zealand.

¹ Cooperative investigation of the Plant Science Research Division, Agricultural Research Service, United States Department of Agriculture, and the Purdue Agricultural Experiment Station, Lafayette, Ind. Purdue Agricultural Experiment Station Journal Paper No. 4377.

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