Apparent Effect of the n Gene of Sorghum on Incidence of Infection by a "Johnson Grass" Strain of Sugar-Cane Mosaic Virus

Abstract

A "Jolmson grass" strain of sugar-cane mosaic virus commonly infects crops of sorghum in New South Wales and Queensland. Infected sorghum plants show one of two types of systemic reaction, either a systemic necrosis or a systemic mosaic. Type of reaction is controlled by a single dominant gene, the N gene. The N-genotypes condition the necrotic reaction, while nn conditions the mosaic reaction (Teakle et al. 1970).