Light‐quality effects on Arabidopsis development. Red, blue and far‐red regulation of flowering and morphology
1992; Wiley; Volume: 86; Issue: 3 Linguagem: Inglês
10.1111/j.1399-3054.1992.tb01341.x
ISSN1399-3054
Autores Tópico(s)Plant Molecular Biology Research
ResumoArabidopsis 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 (P fr /P tot ) 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 P fr /P tot 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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