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Cloning, partial sequencing and expression of a cDNA coding for branching enzyme in cassava

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Abstract

Branching enzyme is involved in the synthesis of amylopectin in plant reserve starch. A cDNA coding for cassava (Manihot esculenta Crantz) branching enzyme was cloned from a λgt11 cDNA library using a potato cDNA probe. The cloned cDNA was partially sequenced. The sequence data confirmed the identity of the clone when compared to that of potato, the homology being ca. 80% at the nucleotide level and 85% at the amino acid level. Furthermore, the cloned cassava cDNA was able to restore branching enzyme activity in a branching enzyme deficient Escherichia coli mutant. Results of the Southern analysis suggested that there is a single gene for this particular branching enzyme in the cassava genome. Study of expression patterns by northern hybridization showed that the gene is highly expressed in tubers. The transcript is detectable in stem and petiole, but not in leaves. In roots, the mRNA is hardly present. The expression levels at different stages of tuber growth are similar with exception of very young tubers in which it is relatively low. It is also shown that there is a difference in the level of branching enzyme expression between different cassava genotypes.

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Author notes

  1. S. N. I. M. Salehuzzaman

    Present address: Department of Botany, University of Chittagong, Bangladesh

Authors and Affiliations

  1. Department of Plant Breeding, Wageningen Agricultural University, P.O. Box 386, NL-6700 AJ, Wageningen, Netherlands

    S. N. I. M. Salehuzzaman, E. Jacobsen & R. G. F. Visser

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  1. S. N. I. M. Salehuzzaman
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  2. E. Jacobsen
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  3. R. G. F. Visser
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Salehuzzaman, S.N.I.M., Jacobsen, E. & Visser, R.G.F. Cloning, partial sequencing and expression of a cDNA coding for branching enzyme in cassava. Plant Mol Biol 20, 809–819 (1992). https://doi.org/10.1007/BF00027152

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  • DOI: https://doi.org/10.1007/BF00027152

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