Inoculum Antibiotics Visible plant symptom Hyphal growth in host Conc. Inhibitors -decreased resistance increased hyphal growth decreased phytoalexins Both protein and RNA s ynthesis necessary for resistance response. Much of the same mechanisms are active in both basic resistance and specific resistance. In fact, many of the same mechanisms are induced by other stresses. However, differences can be shown between basic and specific resistance.
Infection hyphae locate stomate, then produce haustorium.
On hosts, few haustoria formed away from stomate. Comparison of events in infection processes between Cowpea rust and plants displaying non-host resistance or specific resistance. Initial behavior of cowpea rust within host and non-host leaves. In most immune cultivars all invaded cells collapse. Generally, Heath notes that non-host resistance seems to occur early in the infection process , in cowpea rust, during or before the formation of the haustorial mother cell.