キクの生育,光合成および根の活力に及ぼすCO2施用の影響

概要

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To assess the effect of CO2 enrichment on growth of greenhouse chrysanthemum, the plants were cultivated in the phytotron with 300, 600 and 1, 200 ppm CO2. 1. CO2 enriched plants showed a significant increase in stem length, number of leaves, leaf area, and fresh and dry weights. The greatest rate of increase after 60 days of CO2 enrichment was observed in the dry weight of roots (39%). Flower bud formation was delayed 3 days under CO2 enriched condition. 2. No difference in photosynthetic rates of whole plants measured in 400 and 800 ppm CO2 was observed among those grown under high CO2 (600 or 1, 200 ppm) and those grown in ambient air (300 ppm). After 60 days of exposure to ambient and high CO2, the photosynthetic rate measured in 800 ppm CO2 declined markedly compared to the rate at the beginning of the treatment. 3. TTC (2, 3, 5-triphenyl tetrazolium chloride) reductive activity of roots decreased under CO2 enriched atmosphere, but it increased on a per plant basis because fresh weight of the roots increased. There was a high positive correlation between TTC reduction per plant and the fresh weight of the top (aerial part).