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THE PLANT CELL, Vol 3, Issue 7 685-694, Copyright © 1991 by American Society of Plant Biologists
Arabidopsis Mutants Lacking Blue Light-Dependent Inhibition of Hypocotyl Elongation
E. Liscum and R. P. Hangarter
Department of Plant Biology, The Ohio State University, Columbus, Ohio 43210
We have isolated a new class of photomorphogenic mutants in Arabidopsis.
Hypocotyl elongation is not inhibited in the mutant seedlings by continuous
blue light but is inhibited by far red light, indicating that these
mutations are phenotypically different from the previously isolated long
hypocotyl (hy) mutants. Complementation analysis indicated that recessive
nuclear mutations at three genetic loci, designated blu1, blu2, and blu3,
can result in the blu mutant phenotype and that these mutants are
genetically distinct from other long hypocotyl mutants. The BLU genes
appear to be important only during seedling development because the blu
mutations have little effect on mature plants, whereas hypocotyl elongation
and cotyledon expansion are altered in seedlings. The genetic separation of
the blue and far red sensitivities of light-induced hypocotyl inhibition in
the blu and hy mutants demonstrates that two photosensory systems function
in this response.
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