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Titolo:
Photosynthesis, soluble and structural carbon compounds in two Mediterranean oak species (Quercus pubescens and Q-ilex) after lifetime growth at naturally elevated CO2 concentrations
Autore:
Blaschke, L; Schulte, M; Raschi, A; Slee, N; Rennenberg, H; Polle, A;
Indirizzi:
Univ Gottingen, Inst Forstbot, D-37077 Gottingen, Germany Univ Gottingen Gottingen Germany D-37077 bot, D-37077 Gottingen, Germany Univ Essex, Dept Biol Sci, John Tabor Labs, Colchester CO4 3SQ, Essex, England Univ Essex Colchester Essex England CO4 3SQ ester CO4 3SQ, Essex, England CNR, IATA, Inst Environm Anal & Remote Sensing Agr, Florence, Italy CNR Florence Italy Environm Anal & Remote Sensing Agr, Florence, Italy Univ Freiburg, Inst Forstbot & Baumphysiol, Freiburg, Germany Univ Freiburg Freiburg Germany orstbot & Baumphysiol, Freiburg, Germany
Titolo Testata:
PLANT BIOLOGY
fascicolo: 3, volume: 3, anno: 2001,
pagine: 288 - 297
SICI:
1435-8603(200105)3:3<288:PSASCC>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RISING ATMOSPHERIC CO2; DIOXIDE CONCENTRATION; NET PHOTOSYNTHESIS; GAS-EXCHANGE; TREES; FOREST; ACCLIMATION; RESPONSES; PLANTS; ENRICHMENT;
Keywords:
carbohydrate; climate change; elevated CO2; lignin; photosynthesis; Rubisco;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Polle, A Univ Gottingen, Inst Forstbot, Busgenweg 2, D-37077 Gottingen, Germany Univ Gottingen Busgenweg 2 Gottingen Germany D-37077 en, Germany
Citazione:
L. Blaschke et al., "Photosynthesis, soluble and structural carbon compounds in two Mediterranean oak species (Quercus pubescens and Q-ilex) after lifetime growth at naturally elevated CO2 concentrations", PLANT BIO, 3(3), 2001, pp. 288-297

Abstract

To study physiological responses of mature forest trees to elevated CO2 after lifetime growth under elevated atmospheric CO2 concentrations (pCO(2)),photosynthesis, Rubisco content, foliar concentrations of soluble sugars and starch, sugar concentrations in transport tissues (phloem and xylem), structural biomass, and lignin in leaves and branches were investigated in 30- to 50-year-old Quercus pubescens and Q. ilex trees grown at two naturallyelevated CO2 springs in Italy. Ribulose-1,5-bisphosphate carboxylase/oxygenase content was decreased in Q. pubescens grown under elevated CO, concentrations, but not in Q. ilex. Photosynthesis was consistently higher in Q. pubescens grown at elevated CO2 as compared with "control" sites, whereas the response in Q. ilex was less pronounced. Stomatal conductance was lower in both species leading to decreased transpiration and increased instantaneous water use efficiency in Q. pubescens. Overall mean sugar + starch concentrations of the leaves were not affected by elevated pCO(2), but phloem exudates contained higher concentrations of soluble sugars. This finding suggests increased transport to sinks. Qualitative changes in major carbon-bearing compounds, such as structural biomass and lignins, were only found in bark but not in other tissues. These results support the concept that the maintenance of increased rates of photosynthesis after longterm acclimation toelevated pCO(2) provides a means of optimization of water relations under arid climatic conditions but does not cause an increase in aboveground carbon sequestration per unit of tissue in Mediterranean oak species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 01:15:44