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Titolo:
SHORT-TERM EFFECTS OF HIGH LIGHT INTENSITIES ON SOYBEAN NODULE ACTIVITY AND PHOTOSYNTHESIS
Autore:
VIDAL R; GERBAUD A; VIDAL D;
Indirizzi:
CEN CADARACHE,DEPT PHYSIOL VEGETALE & ECOSYST F-13108 ST PAUL DURANCEFRANCE CEN CADARACHE,DEPT PHYSIOL VEGETALE & ECOSYST F-13108 ST PAUL DURANCEFRANCE INRA,LAB ETUD SYMBIOTES RACINES F-34060 MONTPELLIER FRANCE
Titolo Testata:
Environmental and experimental botany
fascicolo: 3, volume: 36, anno: 1996,
pagine: 349 - 357
SICI:
0098-8472(1996)36:3<349:SEOHLI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVITY C2H2 REDUCTION; PHOTO-RESPIRATION; NITROGEN-FIXATION; CO2 ENRICHMENT; LEGUME NODULES; ROOT-NODULES; ACETYLENE; PHOTOINHIBITION; OXYGEN;
Keywords:
GLYCINE MAX; BRADYRHIZOBIUM JAPONICUM; HIGH LIGHT INTENSITY; NITROGENASE ACTIVITY; PHOTOINHIBITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
R. Vidal et al., "SHORT-TERM EFFECTS OF HIGH LIGHT INTENSITIES ON SOYBEAN NODULE ACTIVITY AND PHOTOSYNTHESIS", Environmental and experimental botany, 36(3), 1996, pp. 349-357

Abstract

There is little information available on the effects of highlight intensity (HLI) on nitrogenase activity in legume nodules. Inhibitory as well as stimulatory effects have been described. The hypothesis that an increase in carbohydrate production is involved in these effects wastested by comparing the effects of high light, high CO2, or low O-2 exposure of the shoot. The HLI treatment consisted of tripling the light intensity to 1200 mu E m(-2) s(-1), compared with the growth intensity of 400 mu E m(-2) s(-1). Acetylene reduction activity (ARA) measuring nitrogenase activity was studied in relation to shoot CO:! exchange. HLI stimulated ARA. The stimulation was progressive and reached 17% after 10 hr of treatment. Photosynthesis (P) was initially doubled, but photoinhibition appeared after about 8 hr of HLI. Under HLI, P became limited by N fixation. Other treatments increasing photosynthesis were compared with HLI: elevating the ambient CO2 concentration around the shoot to 900 ppm, or lowering the O-2 concentration to 2%, increased photosynthesis, respectively, by 55% and 70% without effect on ARA. It is concluded that ARA was not regulated by the availability of carbon assimilates and that specific factors promoting or inhibiting ARA are produced by leaves under HLI.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/10/20 alle ore 05:52:47