Economic Botany

, Volume 42, Issue 1, pp 37–44 | Cite as

Biochemical differentiation of clones of OcaOxalis tuberosa, Oxalidaceae) by Their tuber proteins and the properties of these proteins

  • H. Stegemann
  • S. Majino
  • P. Schmiediche


Tuber proteins of oca (Oxalis tuberosa) were separated for clone (cultivar) differentiation by gel electrophoresis in polyacrylamide. The patterns of native proteins and especially of esterases in a porosity gradient with and without urea were suitable for differentiation, whereas SDS-electrophoresis of protomers or focusing of native proteins yielded more or less the same patterns for 23 different accessions. The main proteins are quite acidic (isoelectric points pH 4.7–4.9) and have a relative molecular weight of 17–18 KD (Kilo-Dalton). Amino acid analysis of the protein precipitate by propan-2-ol from tuber sap revealed proteins rich in aspartic and glutamic acid (one third of all amino acids) with a considerable share of essential ones.


Economic Botany Peru Amino Acid Analysis Relative Molecular Weight Tuber Protein 
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Copyright information

© The New York Botanical Garden 1988

Authors and Affiliations

  • H. Stegemann
    • 1
  • S. Majino
    • 2
  • P. Schmiediche
    • 3
  1. 1.Institut für BiochemieBiologische BundesanstaltFederal Republic of Germany
  2. 2.Universidad Nacional “Hermilio Valdizán,” HuánucoPeru
  3. 3.International Potato CenterLimaPeru

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