Development of Hemileia vastatrix in Coffee Plants With Genetic or Induced Resistance

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Abstract
Systemic resistance to coffee rust (Hemileia vastatrix) was induced in susceptible cv, ‘Mundo Novo’ by spraying foliage with a yeast filtrate. The stages of fungal development were compared in leaves of untreated (MN), induced ‘Mundo Novo’ (MN‐I) and coffee rust resistant segregants of the hybrid ‘Sarchimor’ (Sch). Development of H. vastatrix was observed at intervals of 228 h after inoculation. The expression of resistance was detected 48–72 h after inoculation. In Sch, it occurred at the one haustorial mother cell (HMC) stage, whereas in MN‐I, it occurred at the 2nd HMC stage. In Sch the majority of aborted colonies were associated with necrotic host cells, and the collapsed fungal hyphae exhibited a yellow autofluorescence which was observed in necrotic cells of the host. In MN‐I, 80% of the colonies could not be visualized 72 h after inoculation and host cells at the infection sites were not necrotic.

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