Effects of CO_𝟐 Enrichment on Growth and Development of Impatiens hawkeri

Table 2

Chlorophyll content and photosynthetic rate of Impatiens New Guinea grown under two CO₂ concentrations: ambient CO₂ (380 μmol·mol⁻¹) and elevated CO₂ (760 μmol·mol⁻¹).

	Ambient CO2 (380 μmol·mol^−1)	Elevated CO2 (760 μmol·mol^−1)	% increase	𝑃 value
Chlorophyll a (μg·mg^−1)	1.03 ± 0.02	0.76 ± 0.01	−26.2	<0.001
Chlorophyll b (μg·mg^−1)	0.45 ± 0.01	0.39 ± 0.01	−13.3	0.15
Total chlorophyll (μg·mg^−1)	1.81 ± 0.03	1.48 ± 0.02	−18.2	<0.001
Chlorophyll a/b radio	2.28 ± 0.02	1.97 ± 0.06	−13.6	0.004
Photosynthetic rate (μmol·m^−2·s^−1)	11.09 ± 0.30	13.96 ± 0.30	25.9	<0.001

Values given are mean ± standard deviation. Mean values (𝑛=3 samples, with 5 plants per sample) were compared by Student’s t-test. Total chlorophyll: Chlorophyll a + Chlorophyll b. FW: fresh weight.