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Article

Effect of Shading and Nitrogen Source on Growth, Tissue Ammonium and Nitrate Status, and Inflorescence Necrosis in Pinot noir Grapevines

Sanliang Gu, Porter B. Lombard, Steven F. Price
Am J Enol Vitic. January 1996 47: 173-180; published ahead of print January 01, 1996 ; DOI: 10.5344/ajev.1996.47.2.173
Sanliang Gu
Department of Fruit Science, Southwest Missouri State University, Research Campus, Mountain Grove, MO 65711
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Porter B. Lombard
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Steven F. Price
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Abstract

The effect of 60% shading and nitrogen (N) source on growth, tissue NH4+ and NO3- concentrations, and inflorescence necrosis (IN) was investigated in one- and two-year-old potted Pinot noir grapevines. New growth of the vines was significantly reduced by shading and NH4+ feeding resulted in less new growth compared to NO3- feeding. The shaded two-year-old vines developed 26.6% IN compared to only 0.6% on unshaded vines. No IN was induced by either NH4+ or NO3- feeding treatments. Shading increased tissue NH4+ concentration in most tissues of one-year-old vines with few exceptions and in laminas, petioles, and rachis of two-year-old vines. Two-year-old vines fed NH4+ and/or NO3- had a higher rachis, petiole, stem, and young root NH4+ concentration at post-anthesis, compared to the no N control. The NH4+-fed vines had a higher NH4+ concentration than that of NO3##-fed vines only in stems at post-anthesis and young roots pre-anthesis, anthesis, and post-anthesis. Tissue NO3- concentration of laminas, petioles, stems, and young roots was proportional to the amount of NO3--fed to the vines in the root medium. Elevated tissue NH4+ concentration in the rachis of shaded vines and increased incidence of IN suggest that IN is associated with elevated tissue NH4+ levels. NH4+ and/or NO3- in culture media is not a source of elevated NH4+ level for IN development.

  • shading
  • nitrogen forms
  • ammonium
  • nitrate
  • growth
  • inflorescence necrosis
  • early bunch stem necrosis
  • Vitis vinifera
  • Received August 1995.
  • Copyright 1996 by the American Society for Enology and Viticulture

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Effect of Shading and Nitrogen Source on Growth, Tissue Ammonium and Nitrate Status, and Inflorescence Necrosis in Pinot noir Grapevines
Sanliang Gu, Porter B. Lombard, Steven F. Price
Am J Enol Vitic.  January 1996  47: 173-180;  published ahead of print January 01, 1996 ; DOI: 10.5344/ajev.1996.47.2.173

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Effect of Shading and Nitrogen Source on Growth, Tissue Ammonium and Nitrate Status, and Inflorescence Necrosis in Pinot noir Grapevines
Sanliang Gu, Porter B. Lombard, Steven F. Price
Am J Enol Vitic.  January 1996  47: 173-180;  published ahead of print January 01, 1996 ; DOI: 10.5344/ajev.1996.47.2.173
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