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The relationship between water binding and desiccation tolerance in tissuesIn an effort to define the nature of desiccation tolerance, a comparison of the water sorption characteristics was made between tissues that were resistant and tissues that were sensitive to desiccation. Water sorption isotherms were constructed for germinated and ungerminated soybean axes and also for fronds of several species of Polypodium with varying tolerance to dehydration. The strength of water binding was determined by van't Hoff as well as D'Arcy/Watt analyses of the isotherms at 5, 15, and/or 25 degrees C. Tissues which were sensitive to desiccation had a poor capacity to bind water tightly. Tightly bound water can be removed from soybean and pea seeds by equilibration at 35 degrees C over very low relative humidities; this results in a reduction in the viability of the seed. We suggest that region 1 water (i.e. water bound with very negative enthalpy values) is an important component of desiccation tolerance.
Document ID
20040089624
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Vertucci, C. W.
(Cornell University Ithaca, New York 14853, United States)
Leopold, A. C.
Date Acquired
August 21, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Plant physiology
Volume: 85
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Number 40-10
NASA Program Space Biology
Non-NASA Center
NASA Discipline Plant Biology

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