Carbon Dioxide and Flowering in Pharbitis nil Choisy

AUTOR(ES)

Hicklenton, Peter R.

RESUMO

The effects of photoperiod on floral and vegetative development of Pharbitis nil were modified by atmospheric CO2 concentrations maintained during plant growth. Short day (SD) photoperiods caused rapid flowering in Pharbitis plants growing in 0.03 or 0.1% CO2, while plants in long day (LD) conditions remained vegetative. At 1 or 5% CO2, however, flower buds were developed under both the SD and LD photoperiods. Flowering was earliest in the plants exposed to SD at low CO2 concentrations which formed floral buds at stem node 3 or 4. At high CO2 concentrations, floral buds did not form until stem node 6 or 7. Both high CO2 concentrations and LD photoperiods tended to enhance stem elongation and leaf formation.

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