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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Analysis of water potential isotherms in two ornamental shade tree species entering winter dormancy  [1989]

Auge, R.M. (University of Tennessee Institute of Agriculture, Knoxville, TN); Stodola, A.J.W.;

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Osmotic adjustment in response to onset of winter dormancy was characterized in well-watered, potted sweetgum (Liquidambar styraciflua L.) and southern magnolia (Magnolia grandiflora L.) growing outdoors in Knoxville, Tenn. Analyses of water potential isotherms indicated that adjustment occurred in both species, with osmotic potential (symplastic osmotic potential) at full turgor decreasing 0.8 MPa in sweetgum (by the time of first color, 27 Oct.) and 1.0 MPa in magnolia (by 1 Dec.). Osmotic adjustment occurred despite the fact that plants did not suffer osmotic stress; morning and afternoon leaf relative water content (RWC) and leaf water potential (leaf water potential) remained high throughout the fall. Leaf conductance was halved in sweetgum and doubled in magnolia as the autumn progressed. A correlation was found in magnolia between turgid : dry weight ratio and symplastic osmotic potential at full turgor. Tissue elasticity decreased somewhat, as the elastic modulus increased approximately 2 to 3 MPa in each species through the autumn. Water potential isotherms changes most dramatically through the autumn in magnolia. Initially, leaf water potential was -1 MPa at 82% RWC and, by December, leaves were able to withstand leaf water potentials of -3 MPa before RWC dropped to 82%. These changes are similar to those commonly reported as responses to drought or salinity
From the journal
Journal of the American Society for Horticultural Science (USA)
ISSN : 0003-1062

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
1989
Volume:
114
Issue:
4
Start Page:
666
End Page:
673
All titles:
"Analysis of water potential isotherms in two ornamental shade tree species entering winter dormancy"@eng
Other:
"references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
1989
Volume:
114
Issue:
4
Start Page:
666
End Page:
673
All titles:
"Analysis of water potential isotherms in two ornamental shade tree species entering winter dormancy"@eng
Other:
"references"