Seasonal changes in starch and sugar content of poplar (Populus deltoides x nigra cv. Dorskamp) and the impact of stem girdling on carbohydrate allocation to roots.
Identifieur interne : 003130 ( Main/Exploration ); précédent : 003129; suivant : 003131Seasonal changes in starch and sugar content of poplar (Populus deltoides x nigra cv. Dorskamp) and the impact of stem girdling on carbohydrate allocation to roots.
Auteurs : Nicole Regier [Suisse] ; Sebastian Streb ; Samuel C. Zeeman ; Beat FreySource :
- Tree physiology [ 0829-318X ] ; 2010.
Descripteurs français
- KwdFr :
- Amidon (composition chimique), Amidon (physiologie), Azote (métabolisme), Facteurs temps (MeSH), Glucides (composition chimique), Glucides (physiologie), Populus (croissance et développement), Populus (physiologie), Racines de plante (physiologie), Saisons (MeSH), Tiges de plante (physiologie), Transport biologique (MeSH).
- MESH :
- composition chimique : Amidon, Glucides.
- croissance et développement : Populus.
- métabolisme : Azote.
- physiologie : Amidon, Glucides, Populus, Racines de plante, Tiges de plante.
- Facteurs temps, Saisons, Transport biologique.
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Carbohydrates, Starch.
- chemical , metabolism : Nitrogen.
- chemical , physiology : Carbohydrates, Starch.
- growth & development : Populus.
- physiology : Plant Roots, Plant Stems, Populus.
- Biological Transport, Seasons, Time Factors.
Abstract
Trees need to store reserves to allow their survival during winter and for bud flush and leaf growth in the following spring. In many tree species, these reserve functions are mainly covered by starch, which is degraded to soluble carbohydrates during the dormant season for maintenance respiration and in spring during bud flush. We conducted girdling experiments on poplar (Populus deltoides x nigra cv. Dorskamp) in order to elucidate how interrupted transport of carbohydrates to the roots during autumn affects plant survival during winter and bud flush in spring. We measured the content of starch, sucrose, glucose, fructose, raffinose and stachyose in stems (above and below the girdle), coarse roots and fine roots over 1 year. We found that, in response to girdling, carbohydrates accumulated in stems above the girdle. As a result of interrupted reserve allocation, girdled plants depleted their root starch reserves nearly to zero, whereas in stems below the girdle, reserves were maintained close to control values, presumably in order to facilitate dormancy release and re-sprouting from buds below the girdle. Furthermore, we showed that stachyose accumulated during winter also in the roots, even in girdled plants, consistent with its importance as freezing protectant. The lower stachyose content of roots compared with shoots was likely due to protection of the roots from cold by the soil.
DOI: 10.1093/treephys/tpq047
PubMed: 20538808
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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In many tree species, these reserve functions are mainly covered by starch, which is degraded to soluble carbohydrates during the dormant season for maintenance respiration and in spring during bud flush. We conducted girdling experiments on poplar (Populus deltoides x nigra cv. Dorskamp) in order to elucidate how interrupted transport of carbohydrates to the roots during autumn affects plant survival during winter and bud flush in spring. We measured the content of starch, sucrose, glucose, fructose, raffinose and stachyose in stems (above and below the girdle), coarse roots and fine roots over 1 year. We found that, in response to girdling, carbohydrates accumulated in stems above the girdle. As a result of interrupted reserve allocation, girdled plants depleted their root starch reserves nearly to zero, whereas in stems below the girdle, reserves were maintained close to control values, presumably in order to facilitate dormancy release and re-sprouting from buds below the girdle. Furthermore, we showed that stachyose accumulated during winter also in the roots, even in girdled plants, consistent with its importance as freezing protectant. The lower stachyose content of roots compared with shoots was likely due to protection of the roots from cold by the soil.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">20538808</PMID><DateCompleted><Year>2010</Year><Month>11</Month><Day>16</Day></DateCompleted><DateRevised><Year>2013</Year><Month>11</Month><Day>21</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0829-318X</ISSN><JournalIssue CitedMedium="Print"><Volume>30</Volume><Issue>8</Issue><PubDate><Year>2010</Year><Month>Aug</Month></PubDate></JournalIssue><Title>Tree physiology</Title><ISOAbbreviation>Tree Physiol</ISOAbbreviation></Journal><ArticleTitle>Seasonal changes in starch and sugar content of poplar (Populus deltoides x nigra cv. 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We found that, in response to girdling, carbohydrates accumulated in stems above the girdle. As a result of interrupted reserve allocation, girdled plants depleted their root starch reserves nearly to zero, whereas in stems below the girdle, reserves were maintained close to control values, presumably in order to facilitate dormancy release and re-sprouting from buds below the girdle. Furthermore, we showed that stachyose accumulated during winter also in the roots, even in girdled plants, consistent with its importance as freezing protectant. 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Zeeman</name></noCountry><country name="Suisse"><noRegion><name sortKey="Regier, Nicole" sort="Regier, Nicole" uniqKey="Regier N" first="Nicole" last="Regier">Nicole Regier</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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