caa a22 4500 397522770 CHVBK 20180308164637.0 cr unu---uuuuu 161202e199501 xx s 000 0 eng 10.1093/jxb/46.1.83 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.1.83 Dynamic measurements of roots hydraulic conductance using a high-pressure flowmeter in the laboratory and field [Elektronische Daten] [Melvin T. Tyree, Sandra Patiño, John Bennink, John Alexander] A new high-pressure flowmeter(HPFM)is described which is capable of rapid water-flow measurements. The HPFM permits dynamic determination of hydraulic conductance of roots, Kr, and can be used in teh laboratory or field. The base of a root is connected to the HPFM and water is perfused into the root system opposite to the normal direction of flow during trnaspiration. The perfusion pressure is changed at a constant rate of 3-7 kPa s−1 while measuring the flow into the root every 2-4 s. The slope of the plot of flow versus applied pressure is Kr. This paper describes the HPFM, presnents the theory of dynamic flow measurements, discusses sources of error, presnets evidence that dynamic measurements of Kr in Ficus maclellandi (and six other tropical species from Panama) yield the correct result, and demonstrates the use of the method under field conditions in Panama on Cecropia obtusifolia and Palicourea guianensis. © Oxford University Press Research Papers nationallicence High-pressure flowmeter nationallicence root and shoot hydraulic conductance nationallicence Ficus maclellandi nationallicence Cecropia obtusifolia nationallicence Palicourea guianensis nationallicence Tyree Melvin T. Aiken Foresty Science Laboratory PO Box 68, Burlington, VT 05402, USA aut Patiño Sandra Smithsonian Tropical Research Institute PO Box 2072, Balboa, Republic of Panama aut Bennink John Aiken Foresty Science Laboratory PO Box 68, Burlington, VT 05402, USA aut Alexander John Aiken Foresty Science Laboratory PO Box 68, Burlington, VT 05402, USA aut Journal of Experimental Botany Oxford University Press 46/1(1995-01), 83-94 0022-0957 46:1<83 1995 46 exbotj https://doi.org/10.1093/jxb/46.1.83 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.1.83 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tyree Melvin T. Aiken Foresty Science Laboratory PO Box 68, Burlington, VT 05402, USA aut NATIONALLICENCE 700 1- Patiño Sandra Smithsonian Tropical Research Institute PO Box 2072, Balboa, Republic of Panama aut NATIONALLICENCE 700 1- Bennink John Aiken Foresty Science Laboratory PO Box 68, Burlington, VT 05402, USA aut NATIONALLICENCE 700 1- Alexander John Aiken Foresty Science Laboratory PO Box 68, Burlington, VT 05402, USA aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/1(1995-01), 83-94 0022-0957 46:1<83 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford