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Titolo:
Export of carbon from leaf blades of Poa alpina L-at elevated CO2 and two nutrient regimes
Autore:
Baxter, R; Farrar, JF;
Indirizzi:
Univ Wales, Sch Biol Sci, Bangor LL57 2UW, Gwynedd, Wales Univ Wales Bangor Gwynedd Wales LL57 2UW Bangor LL57 2UW, Gwynedd, Wales Univ Wales, Inst Terr Ecol, Bangor Res Unit, Bangor LL57 2UP, Gwynedd, Wales Univ Wales Bangor Gwynedd Wales LL57 2UP Bangor LL57 2UP, Gwynedd, Wales
Titolo Testata:
JOURNAL OF EXPERIMENTAL BOTANY
fascicolo: 336, volume: 50, anno: 1999,
pagine: 1215 - 1221
SICI:
0022-0957(199907)50:336<1215:EOCFLB>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATMOSPHERIC CO2; EXCISED LEAVES; TUSSOCK TUNDRA; DIOXIDE; TEMPERATURE; METABOLISM; PATTERNS; GROWTH; BARLEY;
Keywords:
Poa alpina L.; phloem transport; carbohydrate; compartmentation; export; elevated CO2; nutrients;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Baxter, R Univ Durham, Dept Biol Sci, Sci Labs, South Rd, Durham DH1 3LE, England Univ Durham South Rd Durham England DH1 3LE am DH1 3LE, England
Citazione:
R. Baxter e J.F. Farrar, "Export of carbon from leaf blades of Poa alpina L-at elevated CO2 and two nutrient regimes", J EXP BOT, 50(336), 1999, pp. 1215-1221

Abstract

The hypothesis was tested that, in plants of the alpine! meadow grass (Poaalpina L,) exposed to elevated CO2, net photosynthesis and export from source leaves is; reduced as a result of feedback from sinks. Nutrient supply was used as one way of reducing photosynthesis and export. Single plants were grown in sand culture under specified controlled environmental conditions for a period of 50 d at two levels of nitrogen and phosphorus ('low': 0.2mol m(-3) N, 0.04 mol m(-3) P;'high': 2.5 mol m(-3) N, 0.5 mol m(-3) P). Compartmentation within, and export of carbon from, individual youngest fully expanded leaves of acclimated plants was determined using C-14 feeding and efflux plus mass balance calculations of carbohydrate export. Independentof treatment, the bulk of soluble carbohydrate (65-75%) was present as fructan, with most of the remainder being sucrose. Depending on nutrient supply, CO2 could alter export from source leaves either by a reduction in the amount of sucrose present in a readily available pool for transport, or by altering the rate constant describing phloem loading.

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