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THE PLANT CELL, Vol 1, Issue 9 867-880, Copyright © 1989 by American Society of Plant Biologists
Different Roles for Phytochrome in Etiolated and Green Plants Deduced from Characterization of Arabidopsis thaliana Mutants
J. Chory, C. A. Peto, M. Ashbaugh, R. Saganich, L. Pratt and F. Ausubel
Plant Biology Laboratory, The Salk Institute, P.O. Box 85800, San Diego, California 92138
We have isolated a new complementation group of Arabidopsis thaliana long
hypocotyl mutant (hy6) and have characterized a variety of light-regulated
phenomena in hy6 and other previously isolated A. thaliana hy mutants.
Among six complementation groups that define the HY phenotype in A.
thaliana, three (hy1, hy2, and hy6) had significantly lowered levels of
photoreversibly detectable phytochrome, although near wild-type levels of
the phytochrome apoprotein were present in all three mutants. When
photoregulation of chlorophyll a/b binding protein (cab) gene expression
was examined, results obtained depended dramatically on the light regime
employed. Using the red/far-red photoreversibility assay on etiolated
plants, the accumulation of cab mRNAs was considerably less in the
phytochrome-deficient mutants than in wild-type A. thaliana seedlings. When
grown in high-fluence rate white light, however, the mutants accumulated
wild-type levels of cab mRNAs and other mRNAs thought to be regulated by
phytochrome. An examination of the light-grown phenotypes of the
phytochrome-deficient mutants, using biochemical, molecular, and
morphological techniques, revealed that the mutants displayed incomplete
chloroplast and leaf development under conditions where wild-type
chloroplasts developed normally. Thus, although phytochrome may play a role
in gene expression in etiolated plants, a primary role for phytochrome in
green plants is likely to be in modulating the amount of chloroplast
development, rather than triggering the initiation of events (e.g., gene
expression) associated with chloroplast development.
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