Abstract
Genomic DNA from mustard was cloned in EMBL4 and screened for chalcone synthase (CHS) genes using a heterologous cDNA probe from parsley. Two clones which hybridized with the parsley cDNA probe were isolated. They showed different restriction patterns. One clone was sequenced and identified as a CHS gene by sequence comparison with published CHS sequences. The sequence of the coding region is 1188 bp, and encodes a protein of 43 kDa. The startpoint oas determined by primer extension. The sequence of 0.9 kbp at the 5′ end of the transcription start and part of the noncoding 3′ of this gene were also determined. The coding sequence is interrupted by a single intron of 523 bp. The coding and the noncoding 5′ sequence of this gene was compared with CHS genes from other species. A very high homology was found with the Arabidopsis CHS coding region. A sequence motif (CACGTGT) which is present in most rbcS and all CHS upstream regions, and which specifically binds a protein factor from plant nuclear extracts, is also present in the upstream region of the mustard CHS gene.
Measurements of CHS transcript levels show that phytochrome controls expression of this gene in cotyledons of mustard seedlings; however, blue/UV-light photoreceptors control expression in later stages of development.
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Batschauer, A., Ehmann, B. & Schäfer, E. Cloning and characterization of a chalcone synthase gene from mustard and its light-dependent expression. Plant Mol Biol 16, 175–185 (1991). https://doi.org/10.1007/BF00020550
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DOI: https://doi.org/10.1007/BF00020550