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Titolo:
EFFECTS OF SEASON-LONG CO2 ENRICHMENT ON CEREALS .1. GROWTH-PERFORMANCE AND YIELD
Autore:
WEIGEL HJ; MANDERSCHEID R; JAGER HJ; MEJER GJ;
Indirizzi:
BUNDESFORSCH ANSTALT LANDWIRTSCHAFT,INST PROD & OKOTOXIKOL D-38116 BRAUNSCHWEIG GERMANY
Titolo Testata:
Agriculture, ecosystems & environment
fascicolo: 3, volume: 48, anno: 1994,
pagine: 231 - 240
SICI:
0167-8809(1994)48:3<231:EOSCEO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELEVATED CARBON-DIOXIDE; WINTER-WHEAT; PHOTOSYNTHETIC ACCLIMATION; ATMOSPHERIC CO2; SPRING WHEAT; DRY-MATTER; ENVIRONMENTS; PHYSIOLOGY; RESPONSES; NITROGEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
H.J. Weigel et al., "EFFECTS OF SEASON-LONG CO2 ENRICHMENT ON CEREALS .1. GROWTH-PERFORMANCE AND YIELD", Agriculture, ecosystems & environment, 48(3), 1994, pp. 231-240

Abstract

Two cultivars each of spring wheat (Triticum aestivum L., cultivars 'Star' and 'Turbo') and spring barley (Hordeum vulgare L., cultivars 'Alexis' and 'Arena') were exposed throughout the growing season to ambient (384 p.p.m.) and above ambient CO2 concentrations (471, 551, 624,718 p.p.m.) in open-top chambers. Plant samples were taken four times during plant development and biomass partitioning into stem, leaves andear was measured. Total above-ground biomass increased mainly in the C02 concentration range between 400-550 p.p.m. for wheat, and between 400-700 p.p.m. for barley. Stimulation of biomass was largely due to an increase in tillering rate. At the tiller level CO2 enrichment revealed a decrease in leaf dry weight at anthesis stage, which was due to a reduction in leaf size (barley) and in leaf number (wheat). Specificleaf weight of the mature flag leaf was unaffected by CO2. Stem biomass per tiller was temporarily ('Star', 'Alexis') or during the whole growth period ('Turbo', 'Arena') increased by CO2 exposure, while ear dry weight was increased (barley) or even decreased ('Star'). Except for the barley cultivar 'Arena', which showed a 84% increase in the number of grains per ear, the number of ears was almost entirely responsible for the increased grain yield among the CO2 treatments. At the highest CO2 concentration yield increase amounted to 19% and 27% for the two wheat cultivars, and 5 2% and 8 9% for the two barley cultivars in comparison with the ambient CO2 level. Among all cultivars there was an inverse relationship between the total shoot biomass produced at ambient CO2 conditions and the plant's response to the CO2 enrichment. This indicates that the genetic potential of wheat unlike barley is highly adapted to present atmospheric CO2 conditions and thus responsible for the small CO2 effect on wheat.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 15:36:45