The Relationship between Sugar and Amino Acid Export to the Phloem in Young Wheat Plants

The relationship between amino acid and sugar export to the phloem was studied in young wheat plants (Triticum aestivum L. ‘Pro-INTA, Isla Verde’) using the EDTA-phloem collection technique. Plants grown with a 16 h photoperiod showed a rapid decrease in the concentration of sugars and amino acids i...

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Veröffentlicht in:Annals of botany 1999-07, Vol.84 (1), p.33-38
Hauptverfasser: CAPUTO, CARLA, BARNEIX, ATILIO J.
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description The relationship between amino acid and sugar export to the phloem was studied in young wheat plants (Triticum aestivum L. ‘Pro-INTA, Isla Verde’) using the EDTA-phloem collection technique. Plants grown with a 16 h photoperiod showed a rapid decrease in the concentration of sugars and amino acids in the phloem exudate from the beginning of the dark period. When plants grown with a 16 h photoperiod were kept in the dark for longer than 8 h the free amino acid content in leaves and exudate (on a dry weight basis) increased continually throughout the 72 h of darkness. During the first 24 h of darkness the sugars in the phloem exudate decreased to 30% of the initial value, and returned to the control level when plants were returned to light. When plants grown under low light intensity for 10 d were transferred to high light intensity, they showed an increase in leaf sugar content (dry weight basis) after 3 d but there were no differences in leaf free amino acid content (dry weight basis) compared to low-light plants. The sugar concentration in the phloem exudate was increased by higher light intensities, but there was no difference in the amino acid concentration of the phloem exudate, and thus the amino acid:sugar ratio in the phloem decreased in the high-light plants. The present results suggest that amino acids can be exported to the phloem independently of the export of sugars.
doi_str_mv 10.1006/anbo.1999.0888
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Plants grown with a 16 h photoperiod showed a rapid decrease in the concentration of sugars and amino acids in the phloem exudate from the beginning of the dark period. When plants grown with a 16 h photoperiod were kept in the dark for longer than 8 h the free amino acid content in leaves and exudate (on a dry weight basis) increased continually throughout the 72 h of darkness. During the first 24 h of darkness the sugars in the phloem exudate decreased to 30% of the initial value, and returned to the control level when plants were returned to light. When plants grown under low light intensity for 10 d were transferred to high light intensity, they showed an increase in leaf sugar content (dry weight basis) after 3 d but there were no differences in leaf free amino acid content (dry weight basis) compared to low-light plants. The sugar concentration in the phloem exudate was increased by higher light intensities, but there was no difference in the amino acid concentration of the phloem exudate, and thus the amino acid:sugar ratio in the phloem decreased in the high-light plants. 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The sugar concentration in the phloem exudate was increased by higher light intensities, but there was no difference in the amino acid concentration of the phloem exudate, and thus the amino acid:sugar ratio in the phloem decreased in the high-light plants. 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Plants grown with a 16 h photoperiod showed a rapid decrease in the concentration of sugars and amino acids in the phloem exudate from the beginning of the dark period. When plants grown with a 16 h photoperiod were kept in the dark for longer than 8 h the free amino acid content in leaves and exudate (on a dry weight basis) increased continually throughout the 72 h of darkness. During the first 24 h of darkness the sugars in the phloem exudate decreased to 30% of the initial value, and returned to the control level when plants were returned to light. When plants grown under low light intensity for 10 d were transferred to high light intensity, they showed an increase in leaf sugar content (dry weight basis) after 3 d but there were no differences in leaf free amino acid content (dry weight basis) compared to low-light plants. The sugar concentration in the phloem exudate was increased by higher light intensities, but there was no difference in the amino acid concentration of the phloem exudate, and thus the amino acid:sugar ratio in the phloem decreased in the high-light plants. The present results suggest that amino acids can be exported to the phloem independently of the export of sugars.</abstract><cop>Oxford</cop><pub>Elsevier Science Ltd</pub><doi>10.1006/anbo.1999.0888</doi><tpages>6</tpages></addata></record>
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source Oxford University Press Journals All Titles (1996-Current); EZB-FREE-00999 freely available EZB journals; PubMed Central; Alma/SFX Local Collection; JSTOR
subjects amino acid transport
Amino acids
Amino sugars
carbohydrate metabolism
chemical constituents of plants
dark
exudates
Exudation
Leaves
light intensity
Luminous intensity
nitrogen
Phloem
photoperiod
Plants
ratios
Scotophase
Sugar acids
Sugar exudation
Sugar exudation, amino acid transport, nitrogen, phloem, transport, wheat, Triticum aestivum L
Sugars
translocation (plant physiology)
transport
Triticum aestivum
Triticum aestivum L
wheat
title The Relationship between Sugar and Amino Acid Export to the Phloem in Young Wheat Plants
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