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JXB Advance Access originally published online on March 26, 2004
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Journal of Experimental Botany, Vol. 55, No. 399, pp. 1045-1051, May 1, 2004
© 2004 Oxford University Press

Regulation of Growth, Development and Whole Organism Physiology

Characterization of branching in two Hevea brasiliensis clones

Received 6 October 2003; Accepted 26 January 2004

Christian Cilas1,*, Evelyne Costes2, Jacqueline Milet1, Hyacinthe Legnaté3, Michel Gnagne3 and André Clément-Demange1

1 CIRAD, TA 80/03, Avenue Agropolis, F-34398, Montpellier cedex 5, France
2 UMR BEPC, Architecture et fonctionnement des espèces fruitières, INRA, 2 place Pierre Viala, F-34060, Montpellier cedex 1, France
3 CNRA, Bimbresso, Ivory Coast

* To whom correspondence should be addressed. Fax: +33 4 67 61 71 83. E-mail: christian.cilas{at}cirad.fr

Rubber has been grown for several decades in Africa, notably in Ivory Coast. Although the yields obtained with selected clones are good, some problems with adaptation to edaphic and climatic conditions have yet to be solved. Of these problems, tree breakage due to violent winds during frequent storms is a major handicap. Some clones are more resistant to wind damage. However, this resistance trait remains difficult to measure, and detecting it at an early stage appeared important. As no differences have been found in the physical properties of the wood of different clones, the search for differences between clones displaying resistance and susceptibility to wind damage was switched to architectural structures. Architectural traits were thus studied on two rubber clones with very different resistances to wind. Observations were focused both on young trees and adult trees. Of all the architectural traits observed, a description of branching provided information likely to explain differences in the way the clones being studied developed over time. The clone GT1 which is resistant to wind, developed more lateral branches but they did not grow much in length. On the other hand, fewer axillary branches appeared on the susceptible clone PB235 but they grew longer. Moreover, as some of these traits proved to be similar in both young and adult trees, they could be detected at a sufficiently early stage for use as early prediction traits, if their involvement in susceptibility to wind damage is confirmed.

Key words: Branching, Hevea brasiliensis, predictor traits, tree architecture, wind damage.


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