Some physiological aspects of the relationship between cocoa, Theobroma cacao, and the mistletoe Tapinanthus bangwensis (Engl. and K. Krause)
The anatomy and development of a typical Tapinanthus bangwensis cocoa association is described, and it is shown how the mistletoe haustorium grows obliquely through the xylem of its host, causing the cocoa distal to it to die gradually from desiccation. In early development the mistletoe haustorium forms a plate of tissue between the host xylem and phloem, having roughly equal areas of contact with both. Later the ratio of phloem: xylem haustorial contact decreases. Two experiments using 14C showed that the mistletoe took products of photosynthesis from its hosts, in one case against the expected direction of flow in the host phloem. A third experiment showed that no labelled photosynthates produced by the mistletoe were translocated into cocoa. It is suggested that in this case host hypertrophication is stimulated by the stresses set up by haustorial growth, rather than by mistletoe-produced hormones.
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| Format: | biblioteca |
| Language: | eng |
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Oxford (RU: Oxford University Press,
1971
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| Subjects: | THEOBROMA CACAO, VISCUM, LORANTHACEAE, FLOEMA, XILEMA, INFESTACIÓN, PLANTAS PARASITAS, PLANTAS HUESPEDES, FOTOSINTESIS, COMPETENCIA BIOLOGICA, |
| Online Access: | https://www.jstor.org/stable/42908328 |
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