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Titolo:
Vulnerability to cavitation of leaf minor veins: any impact on leaf gas exchange?
Autore:
Salleo, S; Lo Gullo, MA; Raimondo, F; Nardini, A;
Indirizzi:
Univ Trieste, Dipartimento Biol, I-34127 Trieste, Italy Univ Trieste Trieste Italy I-34127 rtimento Biol, I-34127 Trieste, Italy Univ Messina, Dipartimento Sci Bot, I-98166 Messina S Agata, Italy Univ Messina Messina S Agata Italy I-98166 -98166 Messina S Agata, Italy
Titolo Testata:
PLANT CELL AND ENVIRONMENT
fascicolo: 8, volume: 24, anno: 2001,
pagine: 851 - 859
SICI:
0140-7791(200108)24:8<851:VTCOLM>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRYOSCANNING ELECTRON-MICROSCOPY; INDUCED XYLEM EMBOLISM; STOMATAL CONDUCTANCE; HYDRAULIC CONDUCTANCE; ACOUSTIC EMISSIONS; EXCISED LEAVES; WATER-STRESS; QUERCUS; PLANTS; TREES;
Keywords:
Ceratonia siliqua; Laurus nobilis; fluorescein; leaf vein; stem; stomatal closure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Salleo, S Univ Trieste, Dipartimento Biol, Via L Giorgieri 10, I-34127 Trieste, Italy Univ Trieste Via L Giorgieri 10 Trieste Italy I-34127 te, Italy
Citazione:
S. Salleo et al., "Vulnerability to cavitation of leaf minor veins: any impact on leaf gas exchange?", PL CELL ENV, 24(8), 2001, pp. 851-859

Abstract

Vulnerability to cavitation of leaf minor veins and stems of Laurus nobilis L. was quantified together with that of leaflets, rachides and stems of Ceratonia siliqua L. during air-dehydration of 3-year-old branches. Embolismwas estimated by counting ultrasound acoustic emissions (UAE) and relatingthem to leaf water potential (Psi (L)). The threshold Ti, for cavitation was less negative in L. nobilis than in C. siliqua according to the known higher drought resistance of the latter species. Leaf minor vein cavitation was also quantified by infiltrating leaves with fluorescein at different dehydration levels and observing them under microscope. Distinct decreases in the functional integrity of minor veins were observed during leaf dehydration, with high correlation between the two variables. The relationship between leaf conductance to water vapour (g(L)) and Psi (L) showed that stomata of L. nobilis closed in response to stem and not to leaf cavitation. However, in C siliqua, A decreased in coincidence to the leaf cavitation threshold, which was, nevertheless, very close to that of the stem. The hypothesis that stem cavitation acts as a signal for stomatal closure was confirmed, while the same role for leaf cavitation remains an open problem.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 11:45:27