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Titolo:
Xylem cavitation in the leaf of Prunus laurocerasus and its impact on leafhydraulics
Autore:
Nardini, A; Tyree, MT; Salleo, S;
Indirizzi:
USDA, Forest Serv, Aiken Forestry Sci Lab, Burlington, VT 05402 USA USDA Burlington VT USA 05402 n Forestry Sci Lab, Burlington, VT 05402 USA Univ Trieste, Dipartimento Biol, I-34127 Trieste, Italy Univ Trieste Trieste Italy I-34127 rtimento Biol, I-34127 Trieste, Italy
Titolo Testata:
PLANT PHYSIOLOGY
fascicolo: 4, volume: 125, anno: 2001,
pagine: 1700 - 1709
SICI:
0032-0889(200104)125:4<1700:XCITLO>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-PRESSURE FLOWMETER; SUB-STOMATAL CAVITIES; POPULUS-BALSAMIFERA; ACOUSTIC EMISSIONS; EXCISED LEAVES; LAURUS-NOBILIS; EMBOLISM; CONDUCTANCE; VULNERABILITY; QUERCUS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Tyree, MT USDA, Forest Serv, Aiken Forestry Sci Lab, POB 968, Burlington, VT 05402 USA USDA POB 968 Burlington VT USA 05402 8, Burlington, VT 05402 USA
Citazione:
A. Nardini et al., "Xylem cavitation in the leaf of Prunus laurocerasus and its impact on leafhydraulics", PLANT PHYSL, 125(4), 2001, pp. 1700-1709

Abstract

This paper reports how water stress correlates with changes in hydraulic conductivity of stems, leaf midrib, and whole leaves of Prunus laurocerasus. Water stress caused cavitation-induced dysfunction in vessels of P. laurocerasus. Cavitation was detected acoustically by counts of ultrasonic acoustic emissions and by the loss of hydraulic conductivity measured by a vacuumchamber method. Stems and midribs were approximately equally vulnerable tocavitations. Although midribs suffered a 70% loss of hydraulic conductanceat leaf water potentials of -1.5 MPa, there was less than a 10% loss of hydraulic conductance in whole leaves. Cutting and sealing the midrib 20 mm from the leaf base caused only a 30% loss of conduction of the whole leaf. Ahigh-pressure flow meter was used to measure conductance of whole leaves and as the leaf was progressively cut back from tip to base. These data werefitted to a model of hydraulic conductance of leaves that explained the above results, i.e. redundancy in hydraulic pathways whereby water can flow around embolized regions in the leaf, makes whole leaves relatively insensitive to significant changes in conductance of the midrib. The onset of cavitation events in P. laurocerasus leaves correlated with the onset of stomatal closure as found recently in studies of other species in our laboratory.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 12:54:12