Abstract
Bromegrass mosaic virus (BMV) multiplication was studied in roots of Zea mays L. (sweet corn), Triticum aestivum L. em. Thell. (wheat), Avena sativa L. (oats) and Hordeum vulgare L. (barley). Mechanical inoculation of corn roots with BMV did not produce systemic infection, but BMV moved systemically from inoculated wheat, oat and barley roots. Virus was purified from both corn and barley roots. Ultrastructural modifications of BMV-infected corn and wheat root tips revealed BMV particles almost completely replacing cytoplasmic contents of infected cells with minimal pathological effects. BMV caused significant increases in soluble and residue nitrogen levels of infected seedling roots and shoots. Carbohydrate levels increased in infected shoots and decreased in roots.
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