Effets À Long Terme De L’enrichissement Carboné Et D’un Appoint De Lumière Sur La Productivité De La Rose Cultivée en Serre

Balazsovits, J.; Dansereau, Blanche; Gagnon, Serge; Beeson, Richard C.

doi:10.4141/cjps89-119

Cited by 9 publications

(3 citation statements)

References 7 publications

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“…Higher initial activities for the CO 2 -enriched plants after 20 weeks (mid-May) may indicate light limitations during late winter and early spring when sun angles were low. Balazsovits et al (1989) reported a positive linear effect of supplemental irradiation on cut-flower yield during the winter and early spring. Canopy densities in May appeared to From these results, we conclude that there is no consistent difference in either initial or Mg +2 -CO 2 -activated Rubisco or CA activities between the plants grown in ambient or CO 2enriched atmospheres.…”

Section: Discussionmentioning

confidence: 98%

“…The sustained higher yields reported for roses under prolonged CO 2 enrichment (Balazsovits et al, 1989;Hanan, 1973;Hand and Cockshull, 1975) are hypothesized to be related to the ability of rose leaves to maintain constantly high levels of carbon assimilation. Continuous removal of the flowering shoots promotes renewal of the canopy.…”

Section: Discussionmentioning

confidence: 99%

“…Investigations of the physiological effects of long-term CO 2 enrichment on semiwoody and woody species are rare. Balazsovits et al (1989) reported enhanced yields of up to 60% over control roses during 6 months of enrichment, with diminishing enhancement continuing for up to 2 months after enrichment was stopped. This result suggests that roses do not acclimatize to long-term CO 2 enrichment and, thus, maintain the initial growth rates.…”

mentioning

confidence: 95%

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CO2 Enrichment of Greenhouse Roses Affects Neither Rubisco Nor Carbonic Anhydrase Activities

Beeson¹,

Graham²

1991

jashs

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The effect of prolonged CO2 enrichment on the activities of ribulose l,5-bisphosphate carboxylase/oxygenase (Rubisco) and carbonic anhydrase (CA) of greenhouse roses were studied. Plants of Rosa × hybrids `Red Success' were grown for 2 years at ambient and 900 μl CO2/liter during winter and spring with 75 μmol·m-2·s-1 photosynthetically active radiation supplemental lighting for 2 years. Measurements of initial and Mg+2-CO2-activated activities of Rubisco and CA were made during shoot development and at different positions within the plant canopy. Generally, there were no significant differences measured in the enzyme activities between the two CO2 concentrations. The results suggest that the photosynthetic capacity did not change and that there were no characteristic adaptations to long-term growth (up to 20 weeks) at elevated CO2 concentrations. The maintenance of Rubisco and CA activities with prolonged exposure to CO2-enriched atmospheres is proposed as the reason for long-term yield increases in roses when grown in enriched environments.