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231222s2002 xx ||||| 00| ||eng c |
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|a (NLM)12379791
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Tyree, Melvin T
|e verfasserin
|4 aut
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|a Drought until death do us part
|b a case study of the desiccation-tolerance of a tropical moist forest seedling-tree, Licania platypus (Hemsl.) Fritsch
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|c 2002
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|a Text
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|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
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|2 rdacarrier
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|a Date Completed 21.01.2003
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|a Date Revised 13.05.2019
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|a published: Print
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|a Citation Status MEDLINE
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|a Studies of the desiccation tolerance of 15-month-old Licania platypus (Hemsl.) Fritsch seedlings were performed on potted plants. Pots were watered to field capacity and then dehydrated for 23-46 d to reach various visible wilting stages from slightly-wilted to dead. Root hydraulic conductance, k(r), was measured with a high-pressure flow meter and whole-stem hydraulic conductance, k(ws), was measured by a vacuum chamber method. Leaf punches were harvested for measurement of leaf water potential by a thermocouple psychrometer and for measurement of fresh- and dry-weight. L. platypus was surprisingly desiccation-tolerant, suggesting that most species of central Panama may be well adapted to the seasonality of rainfall in the region. The slightly-wilted stage corresponded to leaf water potentials and relative water contents of -2.7 MPa and 0.85, respectively, but plants did not die until these values fell to -7.5 MPa and 0.14, respectively. As desiccation proceeded k(r) and k(ws) declined relative to irrigated controls, but k(ws) was more sensitive to desiccation than k(r). Values of k(ws) declined by 70-85% in slightly-wilted to dead plants, respectively. By comparison, k(r) showed no significant change in slightly-wilted plants and fell by about 50% in plants having severely-wilted to dead shoots
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|a Journal Article
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|a Water
|2 NLM
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|a 059QF0KO0R
|2 NLM
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|a Vargas, Gustavo
|e verfasserin
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|a Engelbrecht, Bettina M J
|e verfasserin
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|a Kursar, Thomas A
|e verfasserin
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 53(2002), 378 vom: 29. Nov., Seite 2239-47
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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|g volume:53
|g year:2002
|g number:378
|g day:29
|g month:11
|g pages:2239-47
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|d 53
|j 2002
|e 378
|b 29
|c 11
|h 2239-47
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