Floral Induction in a Photoperiodically Insensitive Duckweed, Lemna paucicostata LP6 : Role of Glutamate, Aspartate, and Other Amino Acids and Amides.
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Journal: 2010/July - Plant Physiology
ISSN: 0032-0889
PUBMED: 16666006
Abstract:
The effects of 20 amino acids and two amides were studied on the flowering of a photoperiodically insensitive duckweed, Lemna paucicostata LP6. Alanine, asparagine, aspartate, cystine, glutamate, glutamine, glycine, lysine, methionine, proline, serine, and threonine induced flowering under a photoperiodic regime of 16 hours light and 8 hours darkness. Among these, glutamate and aspartate were found to be the most effective for flower induction. These acids could initiate flowering even at 5 x 10(-7) molar level, though maximal flowering (about 80%) was obtained at 10(-5) molar. Change in the photoperiodic schedule or the pH of the nutrient medium did not influence glutamate- or aspartate-induced flowering. The low concentrations at which glutamate and aspartate are effective suggests that they may have a regulatory role rather than simply acting as metabolites.
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Plant Physiol 86(3): 904-907
PMID: 16666006

Floral Induction in a Photoperiodically Insensitive Duckweed, <em>Lemna paucicostata</em> LP6 <sup><a href="#fn1" rid="fn1" class=" fn">1</a></sup>

Abstract

The effects of 20 amino acids and two amides were studied on the flowering of a photoperiodically insensitive duckweed, Lemna paucicostata LP6. Alanine, asparagine, aspartate, cystine, glutamate, glutamine, glycine, lysine, methionine, proline, serine, and threonine induced flowering under a photoperiodic regime of 16 hours light and 8 hours darkness. Among these, glutamate and aspartate were found to be the most effective for flower induction. These acids could initiate flowering even at 5 × 10 molar level, though maximal flowering (about 80%) was obtained at 10 molar. Change in the photoperiodic schedule or the pH of the nutrient medium did not influence glutamate- or aspartate-induced flowering. The low concentrations at which glutamate and aspartate are effective suggests that they may have a regulatory role rather than simply acting as metabolites.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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  • Posner HB. Inhibitory Effect of Carbohydrate on Flowering in Lemna perpusilla: II. Reversal by Glycine and l-Aspartate. Correlation with Reduced Levels of beta-Carotene and Chlorophyll. Plant Physiol. 1970 Jun;45(6):687–690.[PMC free article] [PubMed] [Google Scholar]
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Unit for Plant Cell and Molecular Biology and Department of Botany, University of Delhi, Delhi-110007, India
Present address: MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, MI 48824.
Supported by a fellowship of the University Grants Commission, New Delhi.
Supported by the Department of Science and Technology of the Government of India.
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Abstract
The effects of 20 amino acids and two amides were studied on the flowering of a photoperiodically insensitive duckweed, Lemna paucicostata LP6. Alanine, asparagine, aspartate, cystine, glutamate, glutamine, glycine, lysine, methionine, proline, serine, and threonine induced flowering under a photoperiodic regime of 16 hours light and 8 hours darkness. Among these, glutamate and aspartate were found to be the most effective for flower induction. These acids could initiate flowering even at 5 × 10 molar level, though maximal flowering (about 80%) was obtained at 10 molar. Change in the photoperiodic schedule or the pH of the nutrient medium did not influence glutamate- or aspartate-induced flowering. The low concentrations at which glutamate and aspartate are effective suggests that they may have a regulatory role rather than simply acting as metabolites.
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