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 |
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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. The present results suggest that amino acids can be exported to the phloem independently of the export of sugars.</description><identifier>ISSN: 0305-7364</identifier><identifier>EISSN: 1095-8290</identifier><identifier>DOI: 10.1006/anbo.1999.0888</identifier><language>eng</language><publisher>Oxford: Elsevier Science Ltd</publisher><subject>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</subject><ispartof>Annals of botany, 1999-07, Vol.84 (1), p.33-38</ispartof><rights>1999 Annals of Botany Company</rights><rights>Copyright Oxford University Press(England) Jul 1999</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c397t-e20c98b273ce4e6300eaf4f3b33d205970c2b5c766a5227737a2cad01c603d0c3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/42766016$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/42766016$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,780,784,803,27923,27924,58016,58249</link.rule.ids></links><search><creatorcontrib>CAPUTO, CARLA</creatorcontrib><creatorcontrib>BARNEIX, ATILIO J.</creatorcontrib><title>The Relationship between Sugar and Amino Acid Export to the Phloem in Young Wheat Plants</title><title>Annals of botany</title><addtitle>Ann Bot</addtitle><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.</description><subject>amino acid transport</subject><subject>Amino acids</subject><subject>Amino sugars</subject><subject>carbohydrate metabolism</subject><subject>chemical constituents of plants</subject><subject>dark</subject><subject>exudates</subject><subject>Exudation</subject><subject>Leaves</subject><subject>light intensity</subject><subject>Luminous intensity</subject><subject>nitrogen</subject><subject>Phloem</subject><subject>photoperiod</subject><subject>Plants</subject><subject>ratios</subject><subject>Scotophase</subject><subject>Sugar acids</subject><subject>Sugar exudation</subject><subject>Sugar exudation, amino acid transport, nitrogen, phloem, transport, wheat, Triticum aestivum L</subject><subject>Sugars</subject><subject>translocation (plant physiology)</subject><subject>transport</subject><subject>Triticum aestivum</subject><subject>Triticum aestivum L</subject><subject>wheat</subject><issn>0305-7364</issn><issn>1095-8290</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNp1kMFuEzEURS0EEiGwZYew2E94tmc842VUCiWqREVbUdhYHs-bxCGxU9uB8vc4GtQdKy_uuc9Xh5DXDBYMQL43vg8LppRaQNd1T8iMgWqqjit4SmYgoKlaIevn5EVKWwDgUrEZubvZIP2KO5Nd8GnjDrTH_BvR0-vj2kRq_ECXe-cDXVo30POHQ4iZ5kBz6V1tdgH31Hn6PRz9mn7boMn0amd8Ti_Js9HsEr76987J7cfzm7OL6vLLp89ny8vKCtXmCjlY1fW8FRZrlAIAzViPohdi4NCoFizvG9tKaRrO21a0hlszALMSxABWzMm76e4hhvsjpqy34Rh9-VIz1UANbQHnZDFBNoaUIo76EN3exD-agT7J0yd5-iRPn-SVwpupsE05xEe65mUIMFnyaspdyvjwmJv4U8uysdEXdz80X60-sJWqdV34txM_mqDNOrqkb685MAFcCdFIXohuIrDI-uUw6mQdeouDi2izHoL739i_8W-WTg</recordid><startdate>19990701</startdate><enddate>19990701</enddate><creator>CAPUTO, CARLA</creator><creator>BARNEIX, ATILIO J.</creator><general>Elsevier Science Ltd</general><general>Oxford University Press</general><general>Academic Press Limited</general><general>Oxford Publishing Limited (England)</general><scope>FBQ</scope><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QO</scope><scope>7SN</scope><scope>7T7</scope><scope>7TM</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>K9.</scope><scope>P64</scope><scope>RC3</scope></search><sort><creationdate>19990701</creationdate><title>The Relationship between Sugar and Amino Acid Export to the Phloem in Young Wheat Plants</title><author>CAPUTO, CARLA ; BARNEIX, ATILIO J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c397t-e20c98b273ce4e6300eaf4f3b33d205970c2b5c766a5227737a2cad01c603d0c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>amino acid transport</topic><topic>Amino acids</topic><topic>Amino sugars</topic><topic>carbohydrate metabolism</topic><topic>chemical constituents of plants</topic><topic>dark</topic><topic>exudates</topic><topic>Exudation</topic><topic>Leaves</topic><topic>light intensity</topic><topic>Luminous intensity</topic><topic>nitrogen</topic><topic>Phloem</topic><topic>photoperiod</topic><topic>Plants</topic><topic>ratios</topic><topic>Scotophase</topic><topic>Sugar acids</topic><topic>Sugar exudation</topic><topic>Sugar exudation, amino acid transport, nitrogen, phloem, transport, wheat, Triticum aestivum L</topic><topic>Sugars</topic><topic>translocation (plant physiology)</topic><topic>transport</topic><topic>Triticum aestivum</topic><topic>Triticum aestivum L</topic><topic>wheat</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>CAPUTO, CARLA</creatorcontrib><creatorcontrib>BARNEIX, ATILIO J.</creatorcontrib><collection>AGRIS</collection><collection>Istex</collection><collection>CrossRef</collection><collection>Biotechnology Research Abstracts</collection><collection>Ecology Abstracts</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Nucleic Acids Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><jtitle>Annals of botany</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>CAPUTO, CARLA</au><au>BARNEIX, ATILIO J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Relationship between Sugar and Amino Acid Export to the Phloem in Young Wheat Plants</atitle><jtitle>Annals of botany</jtitle><addtitle>Ann Bot</addtitle><date>1999-07-01</date><risdate>1999</risdate><volume>84</volume><issue>1</issue><spage>33</spage><epage>38</epage><pages>33-38</pages><issn>0305-7364</issn><eissn>1095-8290</eissn><abstract>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.</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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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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