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Cryobiology. 1999 Sep;39(2):138-43.

Supercooling capacity of seeds and seedlings in Arabidopsis thaliana.

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  • 1Station Biologique, UMR 6553 CNRS, Paimpont, 35380, France.

Abstract

The influence of the water content of seeds and seedlings of Arabidopsis thaliana (Ecotype Columbia:2) on their supercooling capacity was investigated. Equilibration of the seeds to various air relative humidities resulted in final moisture contents ranging from 8 to 82% (dry weight basis). No supercooling point could be detected when the water content remained below 32.5%, and in seeds at just above this moisture level ice crystals started to form at -26 degrees C. However, cooling partly affected the germination of seeds down to a water content of 26.5%. Upon imbibition, the supercooling point of the seeds remained around -21.6 degrees C and rose sharply to -14.7 degrees C when visible germination started. It remained around -13 degrees C during the following 96 h while the water content of the seedlings increased from 155 to 870%. Hydrated seeds (above 32.5% water content), germinated seeds, and seedlings of Arabidopsis cannot survive being frozen.

Copyright 1999 Academic Press.

PMID:
10529306
[PubMed - indexed for MEDLINE]
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