CHANGES IN FREEZING TOLERANCE OF LILY BULBS OF FOUR HYBRID GROUPS DURING LONG-TERM STORAGE AT -2°C

Authors:	H. Imanishi, H. Nagasako, K. Inamoto, M. Doi
Keywords:	Asiatic hybrids, Oriental hybrids, LA hybrids, Easter lily, LT₅₀
Abstract: Changes in freezing tolerance of four groups of hybrid lily bulbs were examined during long-term storage at -2°C. Estimated median lethal temperature (LT₅₀) of shoots became higher with longer storage duration in ‘Le Reve’, ‘Hinomoto’ and ‘Connecticut King’. In ‘Turandot’, the estimated LT₅₀ was almost constant. The estimated LT₅₀ in ‘Connecticut King’ and ‘Turandot’ was still low after storing bulbs for 10 months. All bulbs of these two cultivars were alive, while some bulbs of other two cultivars were already dead after 10 months storage at -2°C. These results indicate that the freezing tolerance of shoots tends to decline with prolonged storage at -2°C.
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