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Properties of Peach Flower Buds Which Facilitate Supercooling

Properties of Peach Flower Buds Which Facilitate Supercooling ABSTRACT Water in dormant peach (Pws persica IL.i Batsch. var. 'Harbrite') flower buds deep supercooled. Both supercooling and the freezing of water within the bud axis and pnmordium as distinct components depended on the viability of the bud axis tissue. The viability of the prmordium not critical. Supercooling prevented by wounding buds with a dissecting needle, indicating that bud structural features were important. Bud morphological features appeared to prevent the propagation of ice through the vascular tissue and into the primordium. In dormant buds, procambial cells had not yet differentiated into xylem vessel elements. Xylem continuity between the bud primordium and adjacent tissues did not appear to be established until buds had deacclimated. It concluded that structural, morphological, and physiological features of the bud facDiltated supercool- physiological and structural features of the peach bud which facilitate supercooling. MATERIALS AND METHODS Peach (Prunus persica [L.] Batsch. var. 'Harbrite') buds were obtained from dormant 9-year-old trees at the West Virginia University Farm at Kearneysville between October 1981 and April 1982. One-year-old twigs were harvested, put into plastic bags, and placed in an insulated box containing either crushed ice or snow. The tissue harvested daily and kept on ice until it http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Physiology American Society of Plant Biologist

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