Abstract

FORERO, RANDY et al. Analysis of resistance to Fusarium oxysporumin Passiflora maliformis L. plants. rev.colomb.cienc.hortic. [online]. 2015, vol.9, n.2, pp.197-208. ISSN 2011-2173.  https://doi.org/10.17584/rcch.2015v9i2.4174.

Fusarium oxysporumis a devastating fungus on commercial plantations of Passiflora species; therefore, the aim of this research was to evaluate P. maliformisas a possible source of resistance to this pathogen. For this purpose, this study used plants from sexual seeds of P. maliformisand observed their response to pathogenic isolates of F. oxysporum, previously identified and demonstrated as a causal agent of Fusarium wilt in P. edulis Sims. Tests were performed in a greenhouse with 2.5 and 19 month-old plants with a follow-up at 70 days and 7 months, respectively. All isolates were pathogenic; however, F. oxysporumA54 was particularly aggressive in both assays; observed symptoms included stunting, chlorosis decay and discoloration of the vascular tissue. In the 2.5-month-old plants, the incidence was 80 to 90% at 42 days post-inoculation and, in the 19-month-old plants; it was 40% at 91 days post-inoculation. Regardless of the age, the inoculated plants presented basal sprouts and produced vascular gels. The results suggest that P. maliformis, starting in the early growth stages, tends to acquire resistance/tolerance levels to attack from the pathogen, which is reflected in recovery through basal sprouting and gel formation in xylem vessels.

Keywords : sprouts; histopathology; gels; colonization; tissues; tolerance.

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