Foliar dehydration tolerance of twelve deciduous tree species |
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Authors: | Auge R; Duan X; Croker J; Witte W; Green C |
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Institution: | Tennessee Agricultural Experiment Station, OHLD, University of Tennessee, PO Box 1071, Knoxville, TN 37901-1071, USACorresponding author; e-mail: auge@utk.edu |
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Abstract: | The potential for foliar dehydration tolerance and maximum capacity for
osmotic adjustment were compared among 12 temperate, deciduous tree
species, under standardized soil and atmospheric conditions. Dehydration
tolerance was operationally defined as lethal leaf water potential
(); the of the last remaining leaves surviving a
continuous, lethal soil drying episode. Nyssa
sylvatica Marsh., and Liriodendron
tulipifera L. were most sensitive to dehydration, having lethal
leaf of -2.04 and -2.38 MPa, respectively. Chionanthus
virginicus L., Quercus prinus L.,
Acer saccharum Marsh., and Quercus
acutissima Carruthers withstood the most dehydration, with
leaves not drying until leaf dropped to -5.63 MPa or below.
Lethal leaf (in MPa) of other, intermediate species were:
Quercus rubra L. (-3.34), Oxydendrum
arboreum (L.) D.C. (-3.98), Halesia
carolina L. (-4.11), Acer rubrum L.
(-4.43), Quercus alba L. (-4.60), and Cornus
florida L. (-4.88). Decreasing lethal leaf was
significantly correlated with increasing capacity for osmotic adjustment.
C. virginicus and Q. acutissima
showed the most osmotic adjustment during the lethal soil drying episode,
with osmotic potential at full turgor declining by 1.73 and 1.44 MPa,
respectively. Other species having reductions in osmotic potential at full
turgor exceeding 0.50 MPa were (in MPa) Q. prinus
(0.89), A. saccharum (0.71), Q.
alba (0.68), H. carolina (0.67),
Q. rubra (0.60), and C. florida
(0.52). |
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