Cold Acclimation and Alterations in Dehydrin-like and Bark Storage Proteins in the Leaves of Sibling Deciduous and Evergreen Peach

in Journal of the American Society for Horticultural Science
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  • 1 Division of Plant and Soil Sciences, West Virginia University, Morgantown, WV 26506
  • 2 U.S. Department of Agriculture, Agriculture Research Service, Appalachian Fruit Research Station, Kearneysville, WV 25430
  • 3 U.S. Department of Agriculture, Agriculture Research Service, Fruit Laboratory, Beltsville, MD 20705

Seasonal changes in cold tolerance and proteins were studied in the leaves of sibling deciduous and evergreen peach [Prunus persica (L.) Batsch]. Freezing tolerance [defined as the subzero temperature at which 50% injury occurred (LT50)] was assessed using electrolyte leakage. Proteins were separated by sodium dodecyl sulfate polyacrylamide-gel electrophoresis. Electroblots were probed with anti-dehydrin and anti-19-kD peach bark storage protein (BSP) antibodies. Leaf LT50 decreased successively from -5.8 °C on 18 Aug. to -10.3 °C in the evergreen genotype and from -7.0 °C to -15.0 °C in the deciduous genotype by 14 Oct. Protein profiles and immunoblots indicated the accumulation of a 60- and 30-kD protein during cold acclimation in the leaves of deciduous trees; however, levels of these proteins did not change significantly in the evergreen trees. Immunoblots indicate that the 60-kD protein is a dehydrin-like protein. Gel-electrophoresis and immunoblots also indicated that the 19-kD BSP progressively disappeared from summer through fall in leaves of deciduous peach but accumulated to a high level in bark tissues. A similar inverse relationship was not evident in evergreen peach.

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