pH-mediated release of betalains from transformed root cultures of Beta vulgaris L.

U. Mukundan, V. Bhide, G. Singh, W. R. Curtis

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Brief exposure of Beta vulgaris root cultures to acidic medium resulted in release of betalain pigments while the capability for regrowth and continued pigment accumulation was retained. A 10-min exposure to pH 2 followed by return to standard growth medium (pH 5.5, 1.1 mM PO4) resulted in release of 0.59 mg pigment/g dry weight over the subsequent 24-h period. The released pigment cor responds to 36.8% of the total pigments. Further improvement in culture productivity was achieved through phosphate limitation. Specific pigment productivity increased fivefold for cultures grown in phosphate-free medium as compared to cultures grown in control medium (1.1 mM PO4). A maximum total pigment production of 25.2 mg/l was observed at an initial medium phosphate level 0.3 mM. When combined with phosphate limitation, low pH facilitated the release of 3.03 mg pigment/g dry weight, which corresponds to 50% of the total pigment. The permeabilized roots were capable of regrowth and continued pigment accumulation. A cytochemical assay for respiratory activity revealed that the basis of regrowth was lateral root initials that were unaffected during the acidic pH treatment.

Original languageEnglish (US)
Pages (from-to)241-245
Number of pages5
JournalApplied Microbiology and Biotechnology
Volume50
Issue number2
DOIs
StatePublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Applied Microbiology and Biotechnology

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