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Titolo:
ULTRASOUND ACOUSTIC EMISSIONS FROM DEHYDRATING LEAVES OF DECIDUOUS AND EVERGREEN TREES
Autore:
KIKUTA SB; LOGULLO MA; NARDINI A; RICHTER H; SALLEO S;
Indirizzi:
AGR UNIV VIENNA,INST BOT,GREGOR MENDEL STR 33 A-1180 VIENNA AUSTRIA UNIV MESSINA,IST BOT I-98166 MESSINA ITALY UNIV TRIESTE,DIPARTIMENTO BIOL I-34127 TRIESTE ITALY
Titolo Testata:
Plant, cell and environment
fascicolo: 11, volume: 20, anno: 1997,
pagine: 1381 - 1390
SICI:
0140-7791(1997)20:11<1381:UAEFDL>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
XYLEM CAVITATION; CERATONIA-SILIQUA; TURGOR PRESSURE; WATER RELATIONS; EXCISED LEAVES; WOODY-PLANTS; EMBOLISM; SAPWOOD; STRESS; CELLS;
Keywords:
CAVITATION THRESHOLD; DEGREE OF SCLEROPHYLLY; LEAF WATER POTENTIAL ISOTHERMS (PRESSURE-VOLUME CURVES); LEAF XYLEM CAVITATION; SIGNALS PER CONDUIT; ULTRASOUND ACOUSTIC EMISSIONS;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
S.B. Kikuta et al., "ULTRASOUND ACOUSTIC EMISSIONS FROM DEHYDRATING LEAVES OF DECIDUOUS AND EVERGREEN TREES", Plant, cell and environment, 20(11), 1997, pp. 1381-1390

Abstract

While drying, detached leaves produced ultrasound acoustic emissions (UAE) comparable to emissions from stem and twig wood, Experiments on Ilex aquifolium L. showed that the main source of these signals was cavitation in the veins, to which conduits and fibres probably both contributed. Regions of the leaf blade with abundant mesophyll and only small veins emitted few signals, More signals were counted on the adaxial side of the midrib than on the abaxial one and on the proximal thirdthan on the distal one, in accordance with the anatomical structure, Sound attenuation was pronounced, Eight species were compared with respect to cavitation behaviour, field water relations and pressure-volume curves, and the data showed differences in cumulative number of events and resistance of leaves to cavitation, Data were generally in goodagreement with anatomical structure and habitat preferences, The number of signals per conduit counted on cross-sections was in some leavesmuch higher than unity, which suggests short xylem elements or an acoustic activity of cells other than conduits, There was no correlation between cavitation threshold or cumulative number of signals and the degree of sclerophylly; unexpectedly, there was a correlation between the cumulative number of signals at a water potential of -1.3 MPa and the bulk modulus of elasticity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 16:39:16