Abstract
A cDNA clone encoding a sucrose-phosphate synthase from sugar beet (BvSPS 1) has been isolated by screening a tap root-specific cDNA library using a heterologous SPS cDNA from spinach. The 3635 by sugar beet cDNA codes for a 1045 amino acid polypeptide with a predicted molecular mass of 118 kDa. The deduced amino acid sequence of sugar beet SPS shows homologies with SPS from maize (71% identity) and spinach (77% identity). Genomic Southern blot analysis suggests that BvSPS 1 is a low-copy-number gene. RNA blot analysis of sink and source leaves, root and tap root tissue shows that SPS 1 is expressed in an organ-specific manner, being predominantly active in tap root. Incubation of detached leaves of sugar beet in light in glucose-containing media leads to an accumulation of the SPS transcript, while sucrose feeding reduces the steady-state level of the mRNA.
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Communicated by J. Schell
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Hesse, H., Sonnewald, U. & Willmitzer, L. Cloning and expression analysis of sucrose-phosphate synthase from sugar beet (Beta vulgaris L.). Molec. Gen. Genet. 247, 515–520 (1995). https://doi.org/10.1007/BF00293155
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DOI: https://doi.org/10.1007/BF00293155