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ARS Home Northeast Area Beltsville, Maryland (BARC) Beltsville Agricultural Research Center Molecular Plant Pathology Laboratory People Ing Ming Lee





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- Con Baker
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Poinsettiaheadline bar poinsettia**Restricted- and free-branching poinsettia plants.** Cultivar V-17 Angelika Red (right), derived from a vegetative cutting of a stock plant, exhibits the free-branching morphotype; the same cultivar (left), derived from somatic embryo exhibits the restricted-branching morphotype.For more than a decade, a biological agent has been suspected to cause free-branching in poinsettias. Attempts to identify the branching agent have failed.In 1996, we proved that phytoplasma is the biological agent causing free-branching. This is the first reported example of a pathogenic phytoplasma as the causal agent of a desirable and economically important trait, free-branching in poinsettia.For details see Nature Biotechnology 15:178-182., 1997.


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