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The gynostegium of Hoya spartioides

By Richard Torres,2014-07-17 00:03
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The gynostegium of Hoya spartioides

The gynostegium of Hoya spartioides (Apocynaceae

    Asclepiadoideae): A striking case of incongruence between molecular and phenotypic evolution.

    Authors: 1Kunze, Henning, Henning.Kunze@t-online.de2Wanntorp, Livia

    Source:

    Organisms Diversity & Evolution; Dec2008, Vol. 8 Issue 5, p346-357, 12p

    Document Type:

    Article

    Subject Terms:

    *HOYA,

    *PHYLOGENY,

    *PHENOTYPE,

    *PLANT morphology,

    *GENETIC markers,

    *PLANTS -- Evolution

    Abstract:

    Abstract: In molecular phylogenies Hoya spartioides, formerly regarded as the only species in a separate genus Absolmsia, is nested in the genus Hoya. It appears as sister to H. curtisii within a larger clade including H. lacunosa, H. imbricata, and H. caudata. In contrast to this close molecular relationship the floral morphology of H. spartioides differs considerably not only from that of its sister, H. curtisii, but from all other species of Hoya investigated so far. Of special interest are the differences in functional morphology of the pollinating apparatus, which in spite of its high degree of synorganization has undergone considerable evolutionary change in H. spartioides. Some of the new traits are even unique within the subfamily Asclepiadoideae as a whole. The large phenotypic distance between H. spartioides and H. curtisii is not reflected in corresponding differences in the tested marker genes, which raises the question of how the flower of H. spartioides has evolved. [Copyright &y& Elsevier]

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