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Cho, Ah Ram,Song, Su Jung,Chung, Sun Woo,Kim, Yoon Jin Elsevier 2019 Scientia horticulturae Vol.247 No.-
<P><B>Abstract</B></P> <P>We investigated the flowering and photosynthetic responses of <I>Phalaenopsis</I> Queen Beer ‘Mantefon’ to CO<SUB>2</SUB> enrichment and light level. Potted plants at the flowering stage were supplied with low light level (LL; 90 ± 10 μmol m<SUP>−2</SUP> s<SUP>−1</SUP>) or high light level (HL; 260 ± 40 μmol m<SUP>−2</SUP> s<SUP>−1</SUP>) using three−wave cool white fluorescent lamps and metal halide lamp and different levels of CO<SUB>2</SUB>. Carbon dioxide was supplied to the plants, which perform crassulacean acid metabolism, during their dark period at three concentrations: 400 (control), 800, and 1200 μmol mol<SUP>−1</SUP> CO<SUB>2</SUB>. More flowers and lateral branches were produced by plants grown under HL than the control plants grown under LL, and there were more visible floral buds in the plants grown under HL than those grown LL, regardless of CO<SUB>2</SUB> concentration. Net CO<SUB>2</SUB> assimilation rate was higher in plants exposed to 800 and 1200 μmol mol<SUP>−1</SUP> CO<SUB>2</SUB> under LL and 1200 μmol mol<SUP>−1</SUP> CO<SUB>2</SUB> than the control plants under LL and HL. We conclude that photosynthesis is enhanced in CO<SUB>2</SUB>-enriched plants, and lateral branch and floral bud production are maximized at the high light level used here in <I>Phalaenopsis</I> Queen Beer ‘Mantefon’.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Higher CO<SUB>2</SUB> under higher light level produced more floral bud and lateral branch. </LI> <LI> Higher CO<SUB>2</SUB> under higher light level fastened flowering without detrimental effects. </LI> <LI> Higher CO<SUB>2</SUB> with low or high light level increased net CO<SUB>2</SUB> assimilation rate. </LI> <LI> High-quality <I>Phalaenopsis</I> could be produced by surplus CO<SUB>2</SUB> under higher light. </LI> </UL> </P>