Abstract：
:Appropriate timing of cold deacclimation is an important component of winter survival of perennial plants, such as trees, in temperate and boreal zones. Recently, concerns about predicted global climate change disturbing deacclimation timing have been increasing. The relationship between ambient temperatures and the manner by which cells' freezing resistance changes is essential for forecasting the timing of deacclimation. In this study, Japanese white birch twigs that underwent deacclimation treatment at a constant temperature of -2, 0, 4, 10, or 20 °C were separated into bark in which cells adapted to subfreezing temperatures by extracellular freezing and xylem in which cells adapted to subfreezing temperatures by deep supercooling, and the freezing resistance of cells in each tissue type was investigated by measuring percentage electrolyte leakage. Birch cells deacclimated in a different manner according to tissue type. Within 7 days under deacclimation treatment, xylem cells decreased their freezing resistance significantly at a high subfreezing temperature (-2 °C). In contrast, bark cells required a temperature of 10 or 20 °C for a detectable decrease in freezing resistance to occur within the same period. At a temperature lower than 0 °C, bark cells did not decrease their freezing resistance, even after 28 days of treatment. The difference in freezing behavior of cells might involve the difference in how deacclimation occurred in bark and xylem cells.
journal_name
Cryobiologyjournal_title
Cryobiologyauthors
Takeuchi M,Kasuga Jdoi
10.1016/j.cryobiol.2017.11.007subject
Has Abstractpub_date
2018-02-01 00:00:00pages
96-100eissn
0011-2240issn
1090-2392pii
S0011-2240(17)30227-4journal_volume
80pub_type
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