Blue-light promotion of flowering is absent in hy4 mutants of Arabidopsis.
Loss of a blue-light photoreceptor in the hy4 mutants of Arabidopsis thaliana (L.) Heynh substantially delayed flowering (> 100 d to flower vs. 40-50 d), especially with blue light exposure from lamps lacking much red (R) and/or far-red (FR) light. Red night breaks were promotory but flowering was still later for the hy4-101 mutant. However, with exposure to light from FR-rich lamps, flowering of all mutants was early and no different from the wild type. Thus, flowering of Arabidopsis involves a blue-light photoreceptor and other, often more effective photoreceptors. The latter may involve phytochrome photoresponses to R and FR, but with little or no phytochrome response to blue wave-lengths.
CSIRO Division of Plant Industry, Canberra, Australia. D.Bagnall@pi.csiro.au
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D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development*; D017353:Gene Deletion; D008027:Light; D010786:Photoreceptor Cells / Q000502:physiology*; D045322:Photosynthetic Reaction Center Complex Proteins / Q000235:genetics*
D045322:Photosynthetic Reaction Center Complex Proteins