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Research Article

Kaolin Particle Film and Water Deficit Influence Malbec Leaf and Berry Temperature, Pigments, and Photosynthesis

Krista C. Shellie, Bradley A. King
Am J Enol Vitic. June 2013 64: 223-230; published ahead of print January 11, 2013 ; DOI: 10.5344/ajev.2012.12115
Krista C. Shellie
1Research Horticulturist, Horticultural Crops Research Unit, U.S. Department of Agriculture, Agricultural Research Service, 29603 U of I Lane, Parma, ID 83660
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  • For correspondence: Krista.Shellie@ars.usda.gov
Bradley A. King
2Research Agricultural Engineer, Northwest Irrigation and Soils Research Laboratory, U.S. Department of Agriculture, Agricultural Research Service, 3793 North 3600 East Kimberly, ID 83341.
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Abstract

The effects of kaolin particle film on traits of commercial interest in the red-skinned winegrape cultivar Malbec (Vitis vinifera L.) were evaluated over three growing seasons by measuring the surface temperatures of leaves and clusters, leaf-level assimilation, leaf and berry pigment composition, and yield of vines grown under differing severities of water deficit with and without a foliar coating of particle film. The vines were irrigated with a standard or reduced amount of water and grown under arid field conditions with high solar radiation. Particle film increased the concentration of total monomeric anthocyanins in berries each year and the ratio of anthocyanins to soluble solids at harvest in two out of three years. The particle film did not alleviate differences in anthocyanin concentration between east- and west-exposed clusters. In vines under reduced irrigation, particle film decreased the cumulative minutes that surface temperatures exceeded 30°C between mid-July through harvest in east- but not west-exposed berries and in east-exposed leaves. Leaves with particle film had lower midmorning rates of assimilation, lower chlorophyll-a to chlorophyll-b ratio, and a higher ratio of chlorophylls to carotenoids than leaves without particle film. Decreased assimilation was unrelated to the magnitude of leaf reflectance of visible light. Particle film did not affect yield components or fruit maturity, indicating that net primary productivity was sufficient to ripen fruit to maturity. These results demonstrate that foliar particle film can facilitate the accumulation of anthocyanins in deficit-irrigated Malbec under warm, arid conditions with high solar radiation.

  • grape
  • particle film
  • heat stress
  • radiation stress
  • solar injury
  • ©2013 by the American Society for Enology and Viticulture
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Kaolin Particle Film and Water Deficit Influence Malbec Leaf and Berry Temperature, Pigments, and Photosynthesis
Krista C. Shellie, Bradley A. King
Am J Enol Vitic.  June 2013  64: 223-230;  published ahead of print January 11, 2013 ; DOI: 10.5344/ajev.2012.12115

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Kaolin Particle Film and Water Deficit Influence Malbec Leaf and Berry Temperature, Pigments, and Photosynthesis
Krista C. Shellie, Bradley A. King
Am J Enol Vitic.  June 2013  64: 223-230;  published ahead of print January 11, 2013 ; DOI: 10.5344/ajev.2012.12115
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