Induction of cambial reactivation by localized heating in a deciduous hardwood hybrid poplar (Populus sieboldii x P. grandidentata).
Identifieur interne : 003B51 ( Main/Exploration ); précédent : 003B50; suivant : 003B52Induction of cambial reactivation by localized heating in a deciduous hardwood hybrid poplar (Populus sieboldii x P. grandidentata).
Auteurs : Shahanara Begum [Japon] ; Satoshi Nakaba ; Yuichiro Oribe ; Takafumi Kubo ; Ryo FunadaSource :
- Annals of botany [ 0305-7364 ] ; 2007.
Descripteurs français
- KwdFr :
- MESH :
- cytologie : Tiges de plante.
- génétique : Populus.
- métabolisme : Populus, Tiges de plante.
- Saisons, Température élevée.
English descriptors
- KwdEn :
- MESH :
- cytology : Plant Stems.
- genetics : Populus.
- metabolism : Plant Stems, Populus.
- Hot Temperature, Seasons.
Abstract
BACKGROUND AND AIMS
The timing of cambial reactivation plays an important role in the control of both the quantity and the quality of wood. The effect of localized heating on cambial reactivation in the main stem of a deciduous hardwood hybrid poplar (Populus sieboldii x P. grandidentata) was investigated.
METHODS
Electric heating tape (20-22 degrees C) was wrapped at one side of the main stem of cloned hybrid poplar trees at breast height in winter. Small blocks were collected from both heated and non-heated control portions of the stem for sequential observations of cambial activity and for studies of the localization of storage starch around the cambium from dormancy to reactivation by light microscopy.
KEY RESULTS
Cell division in phloem began earlier than cambial reactivation in locally heated portions of stems. Moreover, the cambial reactivation induced by localized heating occurred earlier than natural cambial reactivation. In heated stems, well-developed secondary xylem was produced that had almost the same structure as the natural xylem. When cambial reactivation was induced by heating, the buds of trees had not yet burst, indicating that there was no close temporal relationship between bud burst and cambial reactivation. In heated stems, the amount of storage starch decreased near the cambium upon reactivation of the cambium. After cambial reactivation, storage starch disappeared completely. Storage starch appeared again, near the cambium, during xylem differentiation in heated stems.
CONCLUSIONS
The results suggest that, in deciduous diffuse-porous hardwood poplar growing in a temperate zone, the temperature in the stem is a limiting factor for reactivation of phloem and cambium. An increase in temperature might induce the conversion of storage starch to sucrose for the activation of cambial cell division and secondary xylem. Localized heating in poplar stems provides a useful experimental system for studies of cambial biology.
DOI: 10.1093/aob/mcm130
PubMed: 17621596
PubMed Central: PMC2533603
Affiliations:
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The effect of localized heating on cambial reactivation in the main stem of a deciduous hardwood hybrid poplar (Populus sieboldii x P. grandidentata) was investigated.</p></div><div type="abstract" xml:lang="en"><p><b>METHODS</b></p><p>Electric heating tape (20-22 degrees C) was wrapped at one side of the main stem of cloned hybrid poplar trees at breast height in winter. Small blocks were collected from both heated and non-heated control portions of the stem for sequential observations of cambial activity and for studies of the localization of storage starch around the cambium from dormancy to reactivation by light microscopy.</p></div><div type="abstract" xml:lang="en"><p><b>KEY RESULTS</b></p><p>Cell division in phloem began earlier than cambial reactivation in locally heated portions of stems. Moreover, the cambial reactivation induced by localized heating occurred earlier than natural cambial reactivation. In heated stems, well-developed secondary xylem was produced that had almost the same structure as the natural xylem. When cambial reactivation was induced by heating, the buds of trees had not yet burst, indicating that there was no close temporal relationship between bud burst and cambial reactivation. In heated stems, the amount of storage starch decreased near the cambium upon reactivation of the cambium. After cambial reactivation, storage starch disappeared completely. Storage starch appeared again, near the cambium, during xylem differentiation in heated stems.</p></div><div type="abstract" xml:lang="en"><p><b>CONCLUSIONS</b></p><p>The results suggest that, in deciduous diffuse-porous hardwood poplar growing in a temperate zone, the temperature in the stem is a limiting factor for reactivation of phloem and cambium. An increase in temperature might induce the conversion of storage starch to sucrose for the activation of cambial cell division and secondary xylem. Localized heating in poplar stems provides a useful experimental system for studies of cambial biology.</p></div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">17621596</PMID><DateCompleted><Year>2007</Year><Month>11</Month><Day>07</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>13</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0305-7364</ISSN><JournalIssue CitedMedium="Print"><Volume>100</Volume><Issue>3</Issue><PubDate><Year>2007</Year><Month>Sep</Month></PubDate></JournalIssue><Title>Annals of botany</Title><ISOAbbreviation>Ann Bot</ISOAbbreviation></Journal><ArticleTitle>Induction of cambial reactivation by localized heating in a deciduous hardwood hybrid poplar (Populus sieboldii x P. grandidentata).</ArticleTitle><Pagination><MedlinePgn>439-47</MedlinePgn></Pagination><Abstract><AbstractText Label="BACKGROUND AND AIMS" NlmCategory="OBJECTIVE">The timing of cambial reactivation plays an important role in the control of both the quantity and the quality of wood. The effect of localized heating on cambial reactivation in the main stem of a deciduous hardwood hybrid poplar (Populus sieboldii x P. grandidentata) was investigated.</AbstractText><AbstractText Label="METHODS" NlmCategory="METHODS">Electric heating tape (20-22 degrees C) was wrapped at one side of the main stem of cloned hybrid poplar trees at breast height in winter. Small blocks were collected from both heated and non-heated control portions of the stem for sequential observations of cambial activity and for studies of the localization of storage starch around the cambium from dormancy to reactivation by light microscopy.</AbstractText><AbstractText Label="KEY RESULTS" NlmCategory="RESULTS">Cell division in phloem began earlier than cambial reactivation in locally heated portions of stems. Moreover, the cambial reactivation induced by localized heating occurred earlier than natural cambial reactivation. In heated stems, well-developed secondary xylem was produced that had almost the same structure as the natural xylem. When cambial reactivation was induced by heating, the buds of trees had not yet burst, indicating that there was no close temporal relationship between bud burst and cambial reactivation. In heated stems, the amount of storage starch decreased near the cambium upon reactivation of the cambium. After cambial reactivation, storage starch disappeared completely. Storage starch appeared again, near the cambium, during xylem differentiation in heated stems.</AbstractText><AbstractText Label="CONCLUSIONS" NlmCategory="CONCLUSIONS">The results suggest that, in deciduous diffuse-porous hardwood poplar growing in a temperate zone, the temperature in the stem is a limiting factor for reactivation of phloem and cambium. An increase in temperature might induce the conversion of storage starch to sucrose for the activation of cambial cell division and secondary xylem. 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