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Abstract
Hydrogen cyanamide or hot-water treatment (47C) for 1 hr at the 250°GS (Growth Stage) effectively broke rest in dogwood buds within 10 to 12 days. At this growth stage, control plants grown at 25/18C (day/night) maintained an LT50 of –25C throughout the 3-week study period, whereas plants treated with H2CN2 or hot water gradually lost hardiness. After 3 weeks at 5/2C (day/night), the control plants hardened to a hardiness (LT50) of –45C, and H2CN2-treated plants maintained an LT50 of –25C. The results demonstrate that the extent of acclimation and deacclimaton of dogwood plants may be influenced by environmental temperatures and rest status.
in
HortScience
Page:12