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Anti-ice nucleation activity in xylem extracts from trees that contain deep supercooling xylem parenchyma cells

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Title: Anti-ice nucleation activity in xylem extracts from trees that contain deep supercooling xylem parenchyma cells
Authors: Kasuga, Jun Browse this author
Mizuno, Kaoru Browse this author
Arakawa, Keita Browse this author
Fujikawa, Seizo Browse this author
Keywords: supercooling
cold acclimation
boreal hardwood species
anti-ice nucleation substance
heterogeneous ice nucleator
Issue Date: Dec-2007
Journal Title: Cryobiology
Volume: 55
Issue: 3
Start Page: 305
End Page: 314
Publisher DOI: 10.1016/j.cryobiol.2007.08.010
PMID: 17936742
Abstract: Boreal hardwood species, including Japanese white birch (Betula platyphylla Sukat. var. japonica Hara), Japanese chestnut (Castanea crenata Sieb. et Zucc.), katsura tree (Cercidiphyllum japonicum Sieb. et Zucc.), Siebold's beech (Fagus crenata Blume), mulberry (Morus bombycis Koidz.), and Japanese rowan (Sorbus commixta Hedl.), had xylem parenchyma cells (XPCs) that adapt to subfreezing temperatures by deep supercooling. Crude extracts from xylem in all these trees were found to have anti-ice nucleation activity that promoted supercooling capability of water as measured by a droplet freezing assay. The magnitude of increase in supercooling capability of water droplets in the presence of ice-nucleation bacteria, Erwinia ananas, was higher in the ranges from 0.1 to 1.7 degrees C on addition of crude xylem extracts than freezing temperature of water droplets on addition of glucose in the same concentration (100 mosmol/kg). Crude xylem extracts from C japonicum provided the highest supercooling capability of water droplets. Our additional examination showed that crude xylem extracts from C. japonicum exhibited anti-ice nucleation activity toward water droplets containing a variety of heterogeneous ice nucleators, including ice-nucleation bacteria, not only E ananas but also Pseudomonas syringae (NBRC3310) or Xanthomonas campestris, silver iodide or airborne impurities. However, crude xylem extracts from C. japonicum did not affect homogeneous ice nucleation temperature as analyzed by emulsified micro-water droplets. The possible role of such anti-ice nucleation activity in crude xylem extracts in deep supercooling of XPCs is discussed.
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤川 清三

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