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Journal of Experimental Botany, Vol 50, 335-341, Copyright © 1999 by Oxford University Press

ARTICLES

An mRNA encoding a response regulator protein from Brassica napus is up-regulated during pod development

C Whitelaw, W Paul, E Jenkins, V Taylor and J Roberts
School of Biological Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK; Nickerson BIOCEM Ltd., Cambridge Science Park, Milton Road, Cambridge CB4 4GZ, UK; Corresponding author e-mail: jeremy.roberts@nottingham.ac.uk

A novel cDNA (SAC29) was isolated by differential display from pod dehiscence zone tissue during a study directed at identifying genes expressed during pod development in oilseed rape (Brassica napus L.). SAC29 encodes a 136 amino acid putative peptide, which shows homology to various prokarytoic and eukaryotic response regulator proteins. The homologous regions are centred about the four highly conserved amino acid residues of bacterial receivers including the aspartic acid motif required for phosphorylation and subsequent transduction of the initial signal. Northern blot analysis of SAC29 showed hybridization to a 0.6 kb transcript which was most abundant in RNA extracted from the dehiscence zone of pods at 40 d after anthesis. The role of SAC29 as a component in a signalling cascade regulating dehiscence of the pod is discussed.Key words: Brassica napus, dehiscence, pod shatter, response regulator, signal transduction.
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