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Titolo:
LIGHT AND TEMPERATURE-DEPENDENCE OF THE EMISSION OF CYCLIC AND ACYCLIC MONOTERPENES FROM HOLM OAK (QUERCUS-ILEX L.) LEAVES
Autore:
STAUDT M; BERTIN N;
Indirizzi:
INRA,UNITE BIOCLIMATOL,SITE AGROPARC F-84914 AVIGNON 9 FRANCE COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,INST ENVIRONM I-21020 ISPRA ITALY
Titolo Testata:
Plant, cell and environment
fascicolo: 4, volume: 21, anno: 1998,
pagine: 385 - 395
SICI:
0140-7791(1998)21:4<385:LATOTE>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
LEAF ISOPRENE EMISSION; ENVIRONMENTAL-CONDITIONS; SYNTHASE; TREES; PHOTOSYNTHESIS; BIOSYNTHESIS; ATMOSPHERE; ORIGIN; WATER; LEVEL;
Keywords:
QUERCUS ILEX; BIOGENIC VOC EMISSION; EMISSION MODEL; HEAT STRESS; HOLM OAK; ISOPRENOIDS; LIGHT EFFECT; MONOTERPENES; TEMPERATURE EFFECT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
56
Recensione:
Indirizzi per estratti:
Citazione:
M. Staudt e N. Bertin, "LIGHT AND TEMPERATURE-DEPENDENCE OF THE EMISSION OF CYCLIC AND ACYCLIC MONOTERPENES FROM HOLM OAK (QUERCUS-ILEX L.) LEAVES", Plant, cell and environment, 21(4), 1998, pp. 385-395

Abstract

In a laboratory study, we investigated the monoterpene emissions fromQuercus ilex, an evergreen sclerophyllous Mediterranean oak species whose emissions are light dependent, We examined the light and temperature responses of individual monoterpenes emitted from leaves under various conditions, the effect of heat stress on emissions, and the emission-onset during leaf development, Emission rate increased 10-fold during leaf growth, with slight changes in the composition. At 30 degreesC and saturating light, the monoterpene emission rate from mature leaves averaged 4.1 nmol m(-2) s(-1), of which alpha-pinene, sabinene andbeta-pinene accounted for 85%, The light dependence of emission was similar for all monoterpenes: it resembled the light saturation curve of CO2 assimilation, although monoterpene emission continued in the dark. Temperature dependence differed among emitted compounds: most of them exhibited an exponential increase up to 35 degrees C, a maximum at 42 degrees C, and a slight decline at higher temperatures. However, the two acyclic isomers cis-beta-ocimene and trans-beta-ocimene were hardly detected below 35 degrees C, but their emission rates increased above this temperature as the emission rates of other compounds fell, sothat total emission of monoterpenes exponentially increased from 5 to45 degrees C, The ratio between ocimene isomers and other compounds increased with both absolute temperature and time of heat exposure. Thelight dependence of emission was insensitive to the temperature at which it was measured, and vice versa the temperature dependence was insensitive to the light regime. The results demonstrated that none of the models currently applied to simulate isoprene or monoterpene emissions correctly predicts the short-term effects of light and temperature on Q. ilex emissions, The percentage of fixed carbon lost immediately as monoterpenes ranged between 0.1 and 6.0% depending on temperature, but rose up to 20% when leaves were continuously exposed to temperatures between 40 and 45 degrees C.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:16:21