Jason W. Reed, Punita Nagpal, Daniel S. Poole, Masaki Furuya, Joanne Chory, Mutations in the Gene for the Red/Far-Red Light Receptor Phytochrome B Alter Cell Elongation and Physiological Responses throughout Arabidopsis Development, The Plant Cell, Vol. 5, No. 2 (Feb., 1993), pp. 147-157
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Reed et al. (1993) studied this question.