Intraspecific variation in leaf oils of Melaleuca alternifola (Myrtaceae)

Butcher, P.A.; Doran, J.C.; Slee, M.U.

Intraspecific variation in leaf oils of Melaleuca alternifola (Myrtaceae)

1994

Butcher, P.A. | Doran, J.C. | Slee, M.U.

Leaves from 109 trees in 11 populations spanning the geographic range of Melaleuca alternifolia were analyzed for qualitative and quantitative variation in essential oils. Significant differences in oil yield were recorded between populations indicating the potential for improvement from a breeding program. Considerable variation in oil composition was found, both among and within populations. Trees from the northwestern populations produced a terpinolene-rich oil while eastern populations produced an oil with either terpinen-4-ol or 1,8-cineole as the major component. Differences in terpene composition among populations support data from allozyme analyses suggesting genetic differentiation of populations in the northwestern extremity of the species range. The study confirms three previosly identified chemical forms in eastern populations and proposes recognition of two chemical forms in northwestern populations. Populations were identified with individuals suitable for inclusion in a breeding program.

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