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- Title
Development of <em>Hemileia vastatrix</em> in Coffee Plants With Genetic or Induced Resistance.
- Authors
Martins, E. M. F.; Moraes, W. B. C.
- Abstract
Systemic resistance to coffee rust (<em>Hemileia vastatrix</em>) 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-1) and coffee rust resistant segregants of the hybrid `Sarchimor' (Sch). Development of <em>H. vastatrix</em> 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-1, it occurred at the 2nd HMC stage. In Sch the majority of aborted colonies were associated with necrotic host cells, and the collapsed fun gal hyphae exhibited a yellow autofluorescence which was observed in necrotic cells of the host. In MN-1, 80% of the colonies could not be visualized 72 h after inoculation and host cells at the infection sites were not necrotic.
- Subjects
HEMILEIA vastatrix; LEAVES; EDIBLE fungi; INJECTIONS; FUNGICIDE resistance; NECROTIC enteritis
- Publication
Journal of Phytopathology, 1996, Vol 144, Issue 11/12, p519
- ISSN
0931-1785
- Publication type
Article
- DOI
10.1111/j.1439-0434.1996.tb00293.x