CO2 enrichment with light control improves photosynthetic response and flower quality in Phalaenopsis Queen Beer 'Mantefon'
Phalaenopsis are easy to market as they are valued commercially worldwide. CO2 supply has the potential of enhancing plant growth rate, shortening the growth period, and reducing energy costs associated with plant production. We investigated the flowering and photosynthetic responses of Phalaenopsis Queen Beer 'Mantefon' to CO2 enrichment and light level. Potted plants at the flowering stage were supplied with low light intensity (LL; 90±10 μmol m‑2 s‑1) or high light intensity (HL; 260±40 μmol m‑2 s‑1) and different levels of CO2. CO2 was supplied to the plants, which perform CAM metabolism, during their dark period at three concentrations: 400 (control), 800, and 1200 μmol mol‑1 CO2. Net CO2 assimilation rate (Pn) of leaves of 1200 μmol mol‑1 CO2 was higher than those grown under 400 μmol mol‑1 CO2 grown under HL at 8 and 12 weeks after treatment. Flower spike length elongated more in the plants of 1200 μmol mol‑1 CO2 under HL than those under LL. Flower bud production fastened most in the plants of 1200 μmol mol‑1 CO2 under HL. The number of flowers was highest in the plants of 800 and 1200 μmol mol‑1 CO2 under HL among the other treated plants. We conclude that photosynthesis is enhanced in CO2-enriched plants and flower quality is maximized at CO2-enriched with high light intensity combined condition in Phalaenopsis.
Cho, A.R., Chung, S.W. and Kim, Y.J. (2020). CO2 enrichment with light control improves photosynthetic response and flower quality in Phalaenopsis Queen Beer 'Mantefon'. Acta Hortic. 1296, 645-650
flowering, greenhouse cultivation, photosynthesis