Plant Physiol.
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Plant Physiology 99:1469-1474 (1992)
© 1992 American Society of Plant Biologists

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Metabolism and Enzymology

Wheat Vegetative Nitrogen Compositional Changes in Response to Reduced Reproductive Sink Strength 1

Charles T. MacKown, David A. Van Sanford and Ningyan Zhang

Department of Agronomy, University of Kentucky, Lexington, Kentucky 40546-0091, U.S. Department of Agriculture, Agricultural Research Service, University of Kentucky, Lexington, Kentucky 40546-0091

N redistribution patterns and the N composition of vegetative tissues above the peduncle node of wheat (Triticum aestivum L.) plants with altered reproductive sink strength were evaluated to determine the role of vegetative storage proteins in the temporary storage of excess N destined for export. The degree of leaf senescence symptoms (loss of chlorophyll, total N, and ribulose-1,5-bisphosphate carboxylase/oxygenase) were initially reduced, but the complete senescence of vegetative tissues proceeded even for plants completely lacking reproductive sinks. Plants with 50% less sink strength than control plants with intact spikes redistributed vegetative N to the spike almost as effectively as the control plants. Plants without reproductive sinks exported less N from the flag leaf and had flag leaf blades and peduncle tissues with higher soluble protein and {alpha}-NH2 amino acid levels than control plants. An abundant accumulation of polypeptides in the soluble protein profiles of vegetative tissues was not evident in plants with reduced sink strength. Storage of amino acids apparently accommodates any excess N accumulated by vegetative tissues during tissue reproductive growth. Any significant role of vegetative storage proteins in the N economy of wheat is unlikely.

1 Cooperative investigation of the U.S. Department of Agriculture-Agricultural Research Service and Kentucky Agricultural Experiment Station, paper No. 91-3-202, Journal Series, Kentucky Agricultural Experiment Station, Lexington, KY, 40546-0091. Reference to commercial products does not constitute endorsement by the University of Kentucky or U.S. Department of Agriculture-Agricultural Research Service over other products of a similar nature.






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Copyright © 1992 by the American Society of Plant Biologists