First published online February 27, 2003; 10.1104/pp.102.015487
Plant Physiol, March 2003, Vol. 131, pp. 1340-1346
Phytochromes B, D, and E Act Redundantly to Control Multiple
Physiological Responses in Arabidopsis
Keara A.
Franklin,*
Uta
Praekelt,
Wendy M.
Stoddart,
Olivia E.
Billingham,
Karen J.
Halliday, and
Garry C.
Whitelam
Department of Biology, University of Leicester, United
Kingdom LE1 7RH (K.A.F., U.P., W.M.S., G.C.W.), and School of
Biological Sciences, University of Bristol, United Kingdom BS8 1U6
(O.E.B., K.J.H.)
Phytochrome-mediated perception of the ratio of red
to far-red wavelengths in the ambient light environment is
fundamental to plant growth and development. Such monitoring
enables plants to detect neighboring vegetation and initiate avoidance
responses, thus conferring considerable selective advantage. The shade
avoidance syndrome in plants is characterized by elongation growth and
early flowering, responses that are fully induced by end-of-day far-red light treatments. Elucidating the roles of individual phytochromes in
mediating responses to red to far-red has however always been confounded by synergistic and mutually antagonistic coactions between
family members. The creation of triple and quadruple mutants in
Arabidopsis, deficient in multiple phytochromes, has revealed functional redundancy between phyB, D, and E in controlling flowering time, leaf development, and regulation of the homeobox gene,
ATHB-2. In addition, mutant analysis suggests a possible
novel role for phyC in suppressing ATHB-2 transcription
in the light.
*
Corresponding author; e-mail kaf5{at}le.ac.uk; fax
44-0116-252-3330.
© 2003 American Society of Plant Biologists
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