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Tracking rameal traces in sessile oak trunks with X-ray computer tomography: biological bases, preliminary results and perspectives

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Abstract

Branch knots and other traces of lateral axes, known as rameal traces, have generally been disregarded within architectural studies based on external observations and their analysis limited to tedious manual dissection methods. Based on non-destructive methods including X-ray CT scanning (XRCTS) and on the ontogenic knowledge progressively accumulated on Quercus petraea, this paper presents (1) the tracking methodology of all rameal traces with XRCTS and the “Gourmands” plugin, and software created downstream, notably the 3D visualisation software “Bil3D”; (2) preliminary results obtained on two Quercus petraea 50 cm-long logs; and (3) potential applications in the fields of biology and ecology. Of approximately 45 sequences of linked rameal traces (composing rameal sequences) per metre, half were directly connected to the pith as horizontal traces of primary epicormic buds, while the other half were connected to a branch by an oblique knot. Horizontal epicormic knots essentially emerged within the tree from the most intensive thinning treatment and led to additional knots in the clear wood. Secondary epicormic shoots may emerge from branch and epicormic knots, leading to a vertical spread of epicormic sites for the former and to more bud clusters for the latter. Engulfment of lateral axes can be quantified. Assumptions on the origin of between-tree variability are proposed. Our methodology opens the way to an exhaustive description of rameal traces. It is relevant for ontogenic and wood quality assessment at the trunk level. It may also be very useful for characterising the potentiality of reiteration and for repairing shoot damage and vegetative regeneration at the crown, collar and even root system level.

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Acknowledgments

We thank Bruno Chopard, forest engineer at “Office National des Forêts”, for providing wood material and for managing the experimental stand.

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Authors and Affiliations

  1. Laboratoire d’Etude des Ressources Forêt-Bois, INRA-Nancy, UMR 1092 INRA-AgroParisTech, 54280, Champenoux, France

    Francis Colin, Frédéric Mothe, Charline Freyburger, Jean-Baptiste Morisset & Jean-Michel Leban

  2. Moulin de la Housse, Laboratoire de Stress, Défenses et Reproduction des Plantes, UFR Sciences, Bâtiment 18, BP 1039, 51687, Reims Cedex 2, France

    Florence Fontaine

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  1. Francis Colin
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  2. Frédéric Mothe
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  3. Charline Freyburger
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  4. Jean-Baptiste Morisset
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  5. Jean-Michel Leban
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  6. Florence Fontaine
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Correspondence to Francis Colin.

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Communicated by R. Matyssek.

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Colin, F., Mothe, F., Freyburger, C. et al. Tracking rameal traces in sessile oak trunks with X-ray computer tomography: biological bases, preliminary results and perspectives. Trees 24, 953–967 (2010). https://doi.org/10.1007/s00468-010-0466-1

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  • DOI: https://doi.org/10.1007/s00468-010-0466-1

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