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Metabolism and Enzymology

C and N Mobilization from Stalk and Leaves during Kernel Filling by ¹³C and ¹⁵N Tracing in Zea mays L. ¹

Laboratoire du Métabolisme et de la Nutrition des Plantes, Institut National de la Recherche Agronomique, 78026 Versailles Cedex, France, Laboratoire de Structure et Métabolisme des Plantes, C.N.R.S. (URAD 1128), Université de Paris-Sud, Bât. 430, 91405 Orsay Cedex, France, Laboratoire de Biogéochimie Isotopique, INRA-Université P. et M. Curie, C.N.R.S. (U.R.A. 196), T26, 4E, Place Jussieu, 75252 Paris Cedex 05, France

The sink capacity of the stalk in Zea mays L. (cv DEA) during the elongation period was previously investigated with ¹³C and ¹⁵N tracing. The chase experiment described here demonstrates the different behavior of intermediary reserves for C and N remobilization until full maturity of the kernels. Carbon incorporated during stalk elongation participated mainly in cellulose formation in vegetative organs appearing after the labeling period; the remobilization to kernels was low (0.5%). Soluble carbohydrates and proteins were the main intermediary sink compounds, starch being little remobilized. N first incorporated in roots, sheaths, stalk, blades was translocated to the kernel; 42% of the labeled N were recovered in kernels where they represented 8% of the total N. Cob, husk, and shank acted first as N sinks and then as N sources during ear development. It appeared that aminoacids used for synthesis of kernel proteins have a common origin, except for glutelin G₃.

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