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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Fluctuations of cambial activity in relation to precipitation result in annual rings and intra-annual growth zones of xylem and phloem in teak (Tectona grandis) in Ivory Coast
Annals of Botany, Volume 110, No. 4, Year 2012
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Description
Background and AimsTeak forms xylem rings that potentially carry records of carbon sequestration and climate in the tropics. These records are only useful when the structural variations of tree rings and their periodicity of formation are known.MethodsThe seasonality of ring formation in mature teak trees was examined via correlative analysis of cambial activity, xylem and phloem formation, and climate throughout 1·5 years. Xylem and phloem differentiation were visualized by light microscopy and scanning electron microscopy.Key ResultsA 3 month dry season resulted in semi-deciduousness, cambial dormancy and formation of annual xylem growth rings (AXGRs). Intra-annual xylem and phloem growth was characterized by variable intensity. Morphometric features of cambium such as cambium thickness and differentiating xylem layers were positively correlated. Cambium thickness was strongly correlated with monthly rainfall (R2 0·7535). In all sampled trees, xylem growth zones (XGZs) were formed within the AXGRs during the seasonal development of new foliage. When trees achieved full leaf, the xylem in the new XGZs appeared completely differentiated and functional for water transport. Two phloem growth rings were formed in one growing season.ConclusionsThe seasonal formation pattern and microstructure of teak xylem suggest that AXGRs and XGZs can be used as proxies for analyses of the tree history and climate at annual and intra-annual resolution. © 2012 The Author.
Authors & Co-Authors
Dié, Agathe
Belgium, Ghent
Universiteit Gent
Cote D'ivoire, Abidjan
Université de Cocody-abidjan
Kitin, Peter
Belgium, Tervuren
Royal Museum for Central Africa
United States, Madison
Usda Forest Products Laboratory
Kouamé, François N’Guessan
Cote D'ivoire, Abidjan
Université de Cocody-abidjan
van den Bulcke, Jan
Belgium, Ghent
Universiteit Gent
van Acker, Joris C.R.
Belgium, Ghent
Universiteit Gent
Beeckman, Hans
Belgium, Tervuren
Royal Museum for Central Africa
Statistics
Citations: 61
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1093/aob/mcS145
ISSN:
03057364
Research Areas
Environmental
Study Locations
Ivory Coast