Light-quality effects on Arabidopsis development. Red, blue and far-red regulation of flowering and morphology |
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Authors: | Kenneth Eskins |
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Affiliation: | Plant Biochemistry Research, National Center for Agricultural Utilization Research, ARS, USDA, 1815 N, University, Peoria, IL 61604, USA. |
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Abstract: | Arabidopsis thaliana (L.) Heynh. race Columbia plants were grown in red. blue, red + far-red, blue + far-red and various light mixtures of red + blue + far-red light under 14 h light/10 h dark photoperiods. Each single light source and light mixture maintained a constant irradiance (50 μmol m−2 s−1) and the mixtures of red + blue + far-red maintained a constant ratio of red/far-red light, but varied in the ratio of blue to red + far-red light. Depending on the method used for calculation, values of the fraction of phytochrome in the far-red absorbing form (Pfr/Ptot) for these light mixtures were either constant or decreased slightly with increasing percentage of blue light in the mixtures. Arabidopsis flowered early (20 days) in blue, blue + far-red and red + far-red light and late (55 days) in red light. In mixtures of red + blue + far-red light, each of which established a nearly constant Pfr/Ptot flowering was in direct relation to time and irradiance level of blue light. Leaf area and petiole length were also correlated with blue light irradiance levels. |
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Keywords: | Arabidopsis thaliana blue-light receptor flowering irradiance light quality. morphology phytochrome |
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