Technical Report
 

Ammonium Metabolism in Grapes [1993-1994]

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https://ir.library.oregonstate.edu/concern/technical_reports/vd66w133c

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  • The connection between the fruit-set disorder Inflorescence Necrosis (IN) and high ammonium (NI14+) in affected tissues has led to an investigation of NH4+ assimilation enzymes (principally glutamine synthetase (GS) and glutamate synthase) in grape tissues. Previous work in this department has suggested that toxic levels of NH4+ build up in cluster tissue as a result of its inadequate NH4+ assimilation capacity. Current objectives are to isolate key NH4+ assimilation enzymes from different grape tissues and to survey for both presence and activity of those enzymes in plant tissues from within a cultivar and between cultivars. It is expected that varieties more susceptible to IN will have lower NH4+ assimilation capacity. Additionally, shoots in the field have been shaded and defoliated in an attempt to manipulate NH4+ levels in flower clusters.
  • KEYWORDS: Production Science, Viticulture, Vine Physiology, Research
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  • Creasy, G. L., & Breen, P. J. (1994). Ammonium Metabolism in Grapes 1993-1994. Oregon Wine Advisory Board Research Progress Report.
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