Plant Molecular Biology

, Volume 18, Issue 1, pp 1–11

Salt-inducible betaine aldehyde dehydrogenase from sugar beet: cDNA cloning and expression

  • Kent F. McCue
  • Andrew D. Hanson
Article

Abstract

Members of the Chenopodiaceae, such as sugar beet and spinach, accumulate glycine betaine in response to salinity or drought stress. The last enzyme in the glycine betaine biosynthetic pathway is betaine aldehyde dehydrogenase (BADH). In sugar beet the activity of BADH was found to increase two- to four-fold in both leaves and roots as the NaCl level in the irrigation solution was raised from 0 to 500 mM. This increase in BADH activity was paralleled by an increase in level of translatable BADH mRNA. Several cDNAs encoding BADH were cloned from a λgt10 libary representing poly(A)+ RNA from salinized leaves of sugar beet plants, by hybridization with a spinach BADH cDNA. Three nearly full-length cDNA clones were confirmed to encode BADH by their nucleotide and deduced amino acid sequence identity to spinach BADH; these clones showed minor nucleotide sequence differences consistent with their being of two different BADH alleles. The clones averaged 1.7 kb and contained an open reading frame predicting a polypeptide of 500 amino acids with 83% identity to spinach BADH. RNA gel blot analysis of total RNA showed that salinization to 500 mM NaCl increased BADH mRNA levels four-fold in leaves and three-fold in the taproot. DNA gel blot analyses indicated the presence of at least two copies of BADH in the haploid sugar beet genome.

Key words

betaine aldehyde dehydrogenase gene expression glycine betaine osmotic stress salt tolerance sugar beet 

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Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • Kent F. McCue
    • 1
  • Andrew D. Hanson
    • 1
    • 2
  1. 1.DOE Plant Research LaboratoryMichigan State UniversityEast LansingUSA
  2. 2.Centre de Recherche en Biologie végétaleMontréalCanada

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