Freezing behavior of cells in evergreen needle leaves of fir (Abies sachalinensis)

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概要

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• Freezing behavior of cells in evergreen needle leaves of fir was observed by cryo-scanning electron microscopy (cryo-SEM) to determine cellular responses to subzero temperatures. Freezing resistance of needle leaves increased from summer to winter, and needle leaves in winter showed a high survival rate after freezing to -30℃ at a cooling rate of 5℃/day. Cryo-SEM observation revealed that intracellular freezing occurred in cells of the epidermis, hypodermis, mesophyll and endodermis in summer needle leaves frozen to -30℃ at a rate of 0.2℃/min. However, extracellular freezing occurred in cells of all tissues in summer needle leaves by freezing to -30℃ at a rate of 5℃/day. In winter, all cells showed extracellular freezing by freezing to -30℃ at both rapid and slow cooling rates. The results suggest that cells in needle leaves of fir adapt to subzero temperatures by extracellular freezing with development of high resistance to freeze-induced dehydration during seasonal cold acclimation.

• 2012-10-15

著者

• Arakawa Keita

  Research Institute For Biochemical Regulation School Of Agricultural Science Nagoya University

• ENDOH Keita

  Research Faculty and Graduate School of Agriculture, Hokkaido University

• FUJIKAWA Seizo

  Research Faculty and Graduate School of Agriculture, Hokkaido University

• ARAKAWA Keita

  Research Faculty and Graduate School of Agriculture, Hokkaido University

• ENDHO Keita

  Research Faculty and Graduate School of Agriculture, Hokkaido University

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• Freezing behavior of cells in evergreen needle leaves of fir (Abies sachalinensis)

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