J. For. Sci., 2010, 56(2):77-83 | DOI: 10.17221/57/2009-JFS

Arginine and the shade tolerance of white spruce saplings entering winter dormancy

D. J. Durzan
Department of Plant Sciences, University of California, Davis, USA

Shade-tolerant white spruce saplings grown at 100, 45, 25, and 13% natural light for four years, and entering winter dormancy, modified their growth habit and redistributed the total soluble N among needles, roots, and stems with buds mainly to arginine N. Most free amino acid N was found in roots in saplings at full light, and the least at 13% light. Glutamate, glutamine, and aspartate N contributed to the accumulation of soluble arginine N. Arginine-derived γ-guanidinobutyric acid, agmatine and an unidentified guanidino compound accumulated mainly in stems with buds at 25 and 13% light. The profiling N metabolism and arginine-derived guanidino compounds extend models for shade tolerance based mainly on photosynthesis, respiration and carbon gain.

Keywords: amino acids; arginine; guanidino compounds; nitrogen; Picea glauca; shade tolerance; winter dormancy

Published: February 28, 2010  Show citation

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Durzan DJ. Arginine and the shade tolerance of white spruce saplings entering winter dormancy. J. For. Sci. 2010;56(2):77-83. doi: 10.17221/57/2009-JFS.
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