Abstract
Pollen morphology of Ageratum houstonianum Miller infected with Bidens mottle virus (BMoV) was studied by scanning electron microscopy (SEM). Abnormal morphology included tetracolpate grains, collapsed grains, exine ruptures, irregular colpus development, fused grains, and grains with "satellites." Some of these aberrations have been reported from other genera, and hybridization, meiotic irregularities, and apomixis were cited as the primary causal agents. Viral infection should be given consideration as a possible factor for abnormal pollen morphology.
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