Changes revealed by a tracer technique in the amino acid metabolism of thermodormant and non-dormant New York lettuce seeds

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概要

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• The metabolism of glycerol-^<14>C(U) in non-thermodormant New York lettuce seeds was compared with that in thermodormant ones in order to find metabolic changes and a possible osmotic substance(s) in the non-dormant seeds. The higher incorporation of radioactivity into cationic substances in the non-dormant seeds revealed rapid synthesis and large pool sizes for some amino acids, especially Gln and Glu, before radicle protrusion. The enormous accumulation of Gln and Glu in germinating seeds indicates that these amino acids may act as osmotic substances in the germination of New York lettuce seeds. There were no indications that an osmotic substance(s) is included in the neutral and acidic fractions of the 80%-ethanol extracts. Time course analyses of free amino acids showed changes in the metabolism of free amino acids, especially Arg and Asn, at the early stage (4 to 8 hr) of imbibition both in thermodormant and in non-dormant seeds. These data are evidence that the metabolism of amino acids in New York lettuce seeds was affected by temperature treatment from the early stage of imbibition.

• 日本植物生理学会の論文

著者

• Takeda Go

  Laboratory Of Applied Biology Faculty Of Living Science Kyoto Prefectural University

関連論文

• Expression Pattern and Gene Structure of Phenylalanine Ammonia-Lyase in Pharbitis nil
• Accumulation of free amino acids in the tips of non-thermodormant embryonic axes accounts for the increase in the growth potential of New York lettuce seeds
• Effects of temperature, red light and homones on accumulation of free amino acids in osmotically growth-inhibited embryonic axes of New York lettuce seeds
• Activation of phosphate metabolism in cotyledons of Pharbitis nil in the early stage of germination as studied by multicompartmental analysis
• Changes revealed by a tracer technique in the amino acid metabolism of thermodormant and non-dormant New York lettuce seeds
• Measurement of growth potential of the embryo in New York lettuce seed under various combinations of temperature, red light and hormones
• Phytochrome-mediated accumulation of free amino acids in embryonic axes of New York lettuce seeds

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