Abstract
Abstract A four-year-old planting of peach (Prunus persica (L.) Batsch cvs. Cresthaven and Harken on Halford, Lovell, and Siberian C rootstocks was monitored for date of completion of chilling requirement and date of bloom, and change in xylem water potential with bloom. Siberian C rootstock delayed the completion of chilling requirement by 2 days and time of bloom by 4 days in both cultivars. Xylem water potential of fruiting shoots decreased to a minimum just after the swollen bud stage then increased sharply until petal fall. The change in water potential and all 5 bloom stages were delayed by Siberian C but not by Halford or Lovell seedling rootstocks.
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