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Free amino acid content of tobacco nicotiana tabacum cultivar burley 21 leaves developed under different light and temperature conditions



Free amino acid content of tobacco nicotiana tabacum cultivar burley 21 leaves developed under different light and temperature conditions



Journal of Agricultural and Food Chemistry 29(3): 658-660



Free amino acid contents of burley tobacco (N. tabacum L.) leaves differed among genetically uniform plants that were grown under different temperature and light environments. The amino acids were listed in metabolically related groups. Those derived from oxalacetate, .alpha.-ketoglutarate and D-3-phosphoglycerate accumulated in higher concentrations in leaves that developed under short, relative to long, photoperiods. There was a photoperiod by temperature interaction. When end-of-day red or far-red followed 8- or 16-h photosynthetic periods, the highest concentrations of free amino acids accumulated in leaves of plants that received red light at the end of daily 8-h photosynthetic periods. Far-red light following 8-h photosynthetic periods resulted in lower free amino acid concentrations. The responses to brief irradiations with red or far-red light are interpreted to indicate that the phytochrome system was involved, contributing to differences in free amino acid concentrations. Leaf free amino acid contents were influenced by the relative synthesis and depletion activities that existed under each particular environment.

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Accession: 005484700

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