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The characterisation and identification of a naturally occurring hybrid in the genusLeucaena (Leguminosae: Mimosoideae)

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Abstract

Phytogeographical, morphological, and molecular evidence for the widespread but sporadic occurrence of sterile hybrids betweenLeucaena leucocephala subsp.glabrata andL. esculenta subsp.esculenta in South-Central Mexico is presented. Most morphological and DNA characters studied in the putative hybrids showed states intermediate between the proposed parental taxa. The occurrence of non-additive nuclear ribosomal DNA phenotypes is discussed and the need to use a suite of nuclear taxon-specific markers to determine hybridity is emphasized. The origin of the hybrid is discussed in relation to the disruption of the distributions of both parental taxa through use by man as minor food plants, providing another example of the important influence of human interference on the evolution ofLeucaena. The successful use of dried leaf material as a source of DNA is highlighted as an efficient way to identify sterile hybrids at the molecular level.

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  1. Oxford Forestry Institute, Department of Plant Sciences, University of Oxford, South Parks Road, OX1 3RB, Oxford, UK

    Colin E. Hughes & Stephen A. Harris

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  1. Colin E. Hughes
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Hughes, C.E., Harris, S.A. The characterisation and identification of a naturally occurring hybrid in the genusLeucaena (Leguminosae: Mimosoideae). Pl Syst Evol 192, 177–197 (1994). https://doi.org/10.1007/BF00986251

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