Adaptation of Asparagus to overwinter in cold climates

摘要

Asparagus is grown in a broad range of climates, varying not only for the levels of cold winter temperatures but also for the occurrence and severity of freezing events as plants enter or are released from dormancy. Consequently, cultivars bred in different regions can have distinct phenotypes for freezing tolerance and winterhardiness. Studies of hybrids with varying adaptation to the cold winter climate of Ontario, Canada have indicated the timing of fall acclimation and spring deacclimation and concentrations of certain cryoprotective compounds in the crown may be most important for survival. An improved understanding of winterhardiness can offer insights into breeding strategies and indirect selection criteria for the trait.