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Mackown CT, Van Sanford DA, Zhang N. Wheat vegetative nitrogen compositional changes in response to reduced reproductive sink strength. Plant Physiol. 1992;99(4):1469-74doi: 10.1104/pp.99.4.1469.
Mackown, C. T., Van Sanford, D. A., & Zhang, N. (1992). Wheat vegetative nitrogen compositional changes in response to reduced reproductive sink strength. Plant physiology, 99(4), 1469-74. https://doi.org/10.1104/pp.99.4.1469
Mackown, C T, et al. "Wheat vegetative nitrogen compositional changes in response to reduced reproductive sink strength." Plant physiology vol. 99,4 (1992): 1469-74. doi: https://doi.org/10.1104/pp.99.4.1469
Mackown CT, Van Sanford DA, Zhang N. Wheat vegetative nitrogen compositional changes in response to reduced reproductive sink strength. Plant Physiol. 1992 Aug;99(4):1469-74. doi: 10.1104/pp.99.4.1469. PMID: 16669060; PMCID: PMC1080649.
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Plant Physiol. 1992 Aug;99(4):1469-74. doi: 10.1104/pp.99.4.1469.

Wheat vegetative nitrogen compositional changes in response to reduced reproductive sink strength.

Plant physiology

C T Mackown, D A Van Sanford, N Zhang

Affiliations

  1. Department of Agronomy, University of Kentucky, Lexington, Kentucky 40546-0091.

PMID: 16669060 PMCID: PMC1080649 DOI: 10.1104/pp.99.4.1469

Abstract

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-NH(2) 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.

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