Molecular and dendrochronological analysis of natural root grafting in Populus tremuloides (Salicaceae).
Identifieur interne : 003560 ( Main/Exploration ); précédent : 003559; suivant : 003561Molecular and dendrochronological analysis of natural root grafting in Populus tremuloides (Salicaceae).
Auteurs : Hana Jelínková [Canada] ; Francine Tremblay ; Annie DesrochersSource :
- American journal of botany [ 0002-9122 ] ; 2009.
Abstract
Trembling aspen (Populus tremuloides) is a clonal tree species, which regenerates mostly through root suckering. In spite of vegetative propagation, aspen maintains high levels of clonal diversity. We hypothesized that the maintenance of clonal diversity in this species can be facilitated by integrating different clones through natural root grafts into aspen's communal root system. To verify this hypothesis, we analyzed root systems of three pure aspen stands where clones had been delineated with the help of molecular markers. Grafting between roots was frequent regardless of their genotypes. Root system excavations revealed that many roots were still living below trees that had been dead for several years. Some of these roots had no root connections other than grafts to living ramets of different clones. The uncovered root systems did not include any unique genotypes that would not occur among stems. Nevertheless, acquiring roots of dead trees helps to maintain extensive root systems, which increases the chances of clone survival. Substantial interconnectivity within clones as well as between clones via interclonal grafts results in formation of large genetically diverse physiological units. Such a clonal structure can significantly affect interpretations of diverse ecophysiological processes in forests of trembling aspen.
DOI: 10.3732/ajb.0800177
PubMed: 21628295
Affiliations:
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Substantial interconnectivity within clones as well as between clones via interclonal grafts results in formation of large genetically diverse physiological units. Such a clonal structure can significantly affect interpretations of diverse ecophysiological processes in forests of trembling aspen.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">21628295</PMID><DateCompleted><Year>2012</Year><Month>10</Month><Day>02</Day></DateCompleted><DateRevised><Year>2011</Year><Month>06</Month><Day>01</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0002-9122</ISSN><JournalIssue CitedMedium="Print"><Volume>96</Volume><Issue>8</Issue><PubDate><Year>2009</Year><Month>Aug</Month></PubDate></JournalIssue><Title>American journal of botany</Title><ISOAbbreviation>Am J Bot</ISOAbbreviation></Journal><ArticleTitle>Molecular and dendrochronological analysis of natural root grafting in Populus tremuloides (Salicaceae).</ArticleTitle><Pagination><MedlinePgn>1500-5</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.3732/ajb.0800177</ELocationID><Abstract><AbstractText>Trembling aspen (Populus tremuloides) is a clonal tree species, which regenerates mostly through root suckering. In spite of vegetative propagation, aspen maintains high levels of clonal diversity. We hypothesized that the maintenance of clonal diversity in this species can be facilitated by integrating different clones through natural root grafts into aspen's communal root system. To verify this hypothesis, we analyzed root systems of three pure aspen stands where clones had been delineated with the help of molecular markers. Grafting between roots was frequent regardless of their genotypes. Root system excavations revealed that many roots were still living below trees that had been dead for several years. Some of these roots had no root connections other than grafts to living ramets of different clones. The uncovered root systems did not include any unique genotypes that would not occur among stems. Nevertheless, acquiring roots of dead trees helps to maintain extensive root systems, which increases the chances of clone survival. 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