TITLE

Host-specific germination of the root holoparasite Hydnora triceps (Hydnoraceae)

AUTHOR(S)
Bolin, Jay F.; Maass, Erika; Tennakoon, Kushan U.; Musselman, Lytton J.
PUB. DATE
December 2009
SOURCE
Botany;Dec2009, Vol. 87 Issue 12, p1250
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We provide the first germination data on the root-holoparasitic Hydnoraceae. Aqueous root extracts of host and non-host Euphorbia spp. were applied to seeds of Hydnora triceps Drège & Meyer, a narrow endemic of Namibia and South Africa. The seeds of H. triceps germinated only in response to root extracts of its exclusive host, Euphorbia dregeana Meyer, and not for co-occurring non-host Euphorbia spp. This pattern of host specific germination suggests that germination response to host-root cues may be responsible for host partitioning. Provenance of H. triceps seeds and E. dregeana root extracts did not significantly affect germination rates. The round-eared elephant shrew (Macroscelides proboscideus) and the striped mouse (Rhabdomys pumilio) were observed feeding on the fleshy pulp of H. triceps fruits. Small-mammal droppings collected from the same partially consumed fruits contained intact seeds (1.9 ± 1.1 seeds/dropping) providing indirect evidence of seed dispersal by small mammals.
ACCESSION #
47129601

 

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