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Plant Physiol, April 2000, Vol. 122, pp. 1149-1160
Independent Action of ELF3 and phyB to Control Hypocotyl
Elongation and Flowering Time1
Jason W.
Reed,*
Punita
Nagpal,
Ruth M.
Bastow,
Keely S.
Solomon,2
Mandy J.
Dowson-Day,
Rangasamy P.
Elumalai,3 and
Andrew J.
Millar
University of North Carolina, Biology Department, CB #3280, Coker
Hall, Chapel Hill, North Carolina 27599-3280 (J.W.R., P.N.,
K.S.S., R.P.E.); and University of Warwick, Department of Biological
Sciences, Coventry CV4 7AL, United Kingdom (R.M.B., M.J.D.-D., A.J.M.)
Light
regulates various aspects of plant growth, and the photoreceptor
phytochrome B (phyB) mediates many responses to red light. In a screen
for Arabidopsis mutants with phenotypes similar to those of
phyB mutants, we isolated two new elf3
mutants. One has weaker morphological phenotypes than previously
identified elf3 alleles, but still abolishes circadian
rhythms under continuous light. Like phyB mutants,
elf3 mutants have elongated hypocotyls and petioles,
flower early, and have defects in the red light response. However, we
found that elf3 mutations have an additive interaction
with a phyB null mutation, with phyA or
hy4 null mutations, or with a PHYB overexpression
construct, and that an elf3 mutation does not prevent
nuclear localization of phyB. These results suggest that either there
is substantial redundancy in phyB and elf3 function, or the two genes
regulate distinct signaling pathways.
1
This work was supported by the National
Institutes of Health (grant no. R29-GM52456 to J.W.R.) and by the
Biotechnology and Biological Science Research Council (BBSRC: grant no.
G08667 to A.J.M.). K.S.S. was supported in part by the James Henley
Thompson and Evelyn Barnett Thompson Undergraduate Research Fund. The
imaging facilities at the University of Warwick are funded by the
Gatsby Charitable Foundation, by the BBSRC (grant no. BI11209), and by the Royal Society.
2
Present address: Genetics and Molecular Biology
Program, Emory University, Atlanta, GA 30322.
3
Present address: Department of Plant Sciences,
University of Arizona, Tucson, AZ 85721.
*
Corresponding author; e-mail jreed{at}emailunc.edu; fax
919-962-1625.
© 2000 American Society of Plant Physiologists
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