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elongated mesocotyl1, a phytochrome-deficient mutant of maize

Sawers, R.J.H., Linley, P.J., Farmer, P.R., Hanley, N.P., Costich, D.E., Terry, M.J. and Brutnell, T.P. (2002) elongated mesocotyl1, a phytochrome-deficient mutant of maize Plant Physiology, 130, (1), pp. 155-163. (doi:10.1104/pp.006411).

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To begin the functional dissection of light signal transduction pathways of maize (Zea mays), we have identified and characterized the light-sensing mutant elm1 (elongated mesocotyl1). Seedlings homozygous for elm1 are pale green, show pronounced elongation of the mesocotyl, and fail to de-etiolate under red or far-red light. Etiolated elm1 mutants contain no spectrally active phytochrome and do not deplete levels of phytochrome A after red-light treatment. High-performance liquid chromatography analyses show that elm1 mutants are unable to convert biliverdin IXalpha to 3Z-phytochromobilin, preventing synthesis of the phytochrome chromophore. Despite the impairment of the phytochrome photoreceptors, elm1 mutants can be grown to maturity in the field. Mature plants retain aspects of the seedling phenotype and flower earlier than wild-type plants under long days. Thus, the elm1 mutant of maize provides the first direct evidence for phytochrome-mediated modulation of flowering time in this agronomically important species.

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Published date: September 2002


Local EPrints ID: 56210
ISSN: 0032-0889
PURE UUID: 6157d263-89b0-40d6-877c-b5202790f771

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Date deposited: 08 Aug 2008
Last modified: 17 Jul 2017 14:31

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Author: R.J.H. Sawers
Author: P.J. Linley
Author: P.R. Farmer
Author: N.P. Hanley
Author: D.E. Costich
Author: M.J. Terry
Author: T.P. Brutnell

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