Effect of Light Intensity, Carbon Dioxide Concentration, and Leaf Temperature on Gas Exchange of Spray Carnation Plants |
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Authors: | ENOCH H Z; HURD R G |
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Abstract: | The rates of CO2 assimilation by potted spray carnation plants(cv. Cerise Royalette) were determined over a wide range oflight intensities (45450 W m2 PAR), CO2 concentrations(2003100 vpm), and leaf temperatures (535 °C).Assimilation rates varied with these factors in a way similarto the response of single leaves of other temperate crops, althoughthe absolute values were lower. The optimal temperature forCO2 assimilation was between 5 and 10 °C at 45 W m2PAR but it increased progressively with increasing light intensityand CO2 concentration up to 27 °C at 450 W m2 PARand 3100 vpm CO2 as expressed by the equation TOpt = 6.47-h 2.336 In G + 0.031951 where C is CO2 concentration in vpmand I is photo-synthetically active radiation in W m2.CO2 enrichment also increased stomatal resistance, especiallyat high light intensities. The influence of these results on optimalization of temperaturesand CO2 concentrations for carnation crops subjected to dailylight variation, and the discrepancy between optimal temperaturesfor growth and net photosynthesis, are discussed briefly |
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