Genetics, Vol. 148, 1295-1310, March 1998, Copyright © 1998

Suppressors of an Arabidopsis thaliana phyB Mutation Identify Genes That Control Light Signaling and Hypocotyl Elongation

Jason W. Reeda, Rangasamy P. Elumalaia, and Joanne Choryb
a Biology Department, University of North Carolina, Chapel Hill, North Carolina 27599-3280,
b Howard Hughes Medical Institute, Plant Biology Laboratory, The Salk Institute, San Diego, California 92186-5800

Corresponding author: Jason W. Reed, Department of Biology, University of North Carolina, CB #3280, Coker Hall, Chapel Hill, NC 27599-3280, jreed{at}email.unc.edu (E-mail).

Communicating editor: V. SUNDARESAN

Ambient light controls the development and physiology of plants. The Arabidopsis thaliana photoreceptor phytochrome B (PHYB) regulates developmental light responses at both seedling and adult stages. To identify genes that mediate control of development by light, we screened for suppressors of the long hypocotyl phenotype caused by a phyB mutation. Genetic analyses show that the shy (short hy pocotyl) mutations we have isolated fall in several loci. Phenotypes of the mutants suggest that some of the genes identified have functions in control of light responses. Other loci specifically affect cell elongation or expansion.




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