The effect of quantum flux density and net photosynthetic rate on morphology and time to flower of hybrid geraniums |
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| Authors: | AM Armitage CE Sams RM Miranda WH Carlson JA Flore |
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| Institution: | Department of Horticulture, Michigan State University, East Lansing, MI 48824 U.S.A. |
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| Abstract: | Three cultivars of 63-day-old hybrid geraniums (Pelargonium × hortorum Bailey) were grown under high (800–1200 mE m?2 s?1), medium (300–600 mE m?2 s?1) or low (100–160 mE m?2 s?1) quantum flux densities. Plants grown under low light and 25% greater total leaf area but 25% lower dry weight than plants grown under medium or high levels, regardless of cultivar. Time to flower in all cultivars was negatively correlated with quantum flux density, and specific leaf weight and leaf thickness were positively correlated to net photosynthetic rate. ‘Sprinter Scarlet’ and ‘Sooner Red’ had similar correlation coefficients (r) for most relationships, but r values for ‘Ringo’ were generally not as strong. Quantum flux density appears to affect both organogenesis and maturation of the flower. |
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| Keywords: | photosynthesis quantum flux density |
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