Transcriptional response of glycinebetaine-related genes to salt stress and light in leaf beet
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<i>Beta vulgaris</i> L. accumulates a large amount of glycinebetaine (betaine), a metabolite that is related to salt-tolerance. Production of betaine involves expression of many genes that encode enzymes such as betaine aldehyde dehydrogenase, choline monooxygenase, phosphoethanolamine <i>N</i>-methyltransferase, <i>S</i>-adenosyl-<small>L</small>-methionine synthetase, <i>S</i>-adenosyl-<small>L</small>-homocysteine hydrolase, and methionine synthase. We examined transcriptional regulation of the betaine-related genes in leaf beet (<i>Beta vulgaris</i> L. var cicla, cv. shirogukifudanna). Transcript expression of these betaine-related genes in leaf tissue had the following common features: (1) a similar pattern of transcript induction under salt stress, (2) reduced induction under salt stress in a dark condition, and (3) diurnal rhythms of transcript levels under a photoperiod of 16 h light/8 h darkness. The co-regulation of transcripts may contribute to the effective betaine production without disturbing the biosynthesis of other products in leaf beet.
- Plant tissue culture letters
Plant tissue culture letters 23(3), 317-320, 2006-06-01
Japanese Society for Plant Cell and Molecular Biology