Selection and propagation of jarrah for dieback resistance: a progress report
McComb, J.A., Bennett, I.J., Stukely, M. and Crane, C.E. (1990) Selection and propagation of jarrah for dieback resistance: a progress report. In: Proceedings of the International Plant Propagator's Society Vol. 40 pp. 86-90.
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Jarrah (Eucalyptus marginata Donn ex Smith), a valuable hardwood restricted to Western Australia, provides two-thirds of the sawn timber from the State. Natural stands have been badly affected by dieback caused by the soil fungus Phytophthora cinnamomi Rands (5). It is suspected that a low, but significant number of jarrah plants may show resistance to the disease. If lines of jarrah known to be resistant were available, they could be used to replant "graveyard" areas where the disease has killed virtually all jarrah, and in reafforestation after bauxite mining.
Clones have been raised from mature trees which have survived in graveyard areas, using nodal explants from the crown of the trees. Some clonal lines showed a level of resistance to the disease (1), but the tissue culture process was very difficult. Branches from the crowns of the trees were hard to surface sterilize, shoot multiplication rate was low, shoots did not root until after a prolonged period (3)
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|Murdoch Affiliation:||School of Biological and Environmental Sciences|
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