Morphological aspects and effect of carbon sources in the physiology of Fusarium oxysporum f. sp. passiflorae

Authors

  • Aricleia de Moraes Catarino Post-Graduation Program in Agriculture in the Humid Tropics, National Research Institute of the Amazon, Manaus, AM, Brazil
  • Antonia A. C. Rodrigues, Machado Gois de Oliveira Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil
  • Diogo H.S. Sardinha Gomes da Costa Agroecology, State University of Maranhão, São Luís, Maranhão State, Brazil

DOI:

https://doi.org/10.9755/ejfa.2018.v30.i1.1588

Keywords:

fusariosis, morphology, mycelial growth, sporulation, yellow passion fruit

Abstract

The objective of this study was to evaluate the morphological and physiological characteristics of F. oxysporum f. sp. passiflorae. Isolates were obtained from yellow passion fruit plants with fusariosis symptoms grown in four production poles. The pathogenicity test was carried out on seedlings of this crop, under greenhouse conditions. The morphological characters evaluated were the size of macroconidia and microconidia in single conidiophores or in false heads; number of septa, presence of basal cell in the macroconidia and chlamydospores, and the aspects of the colonies of the isolates cultivated in PDA culture medium for aerial mycelium formation and colony coloration. The carbon sources: starch, lactose, maltose and sucrose were tested for the three most virulent isolates obtained in the pathogenicity test. The mycelial growth was obtained through readings every 24 hours of the diameter of the colony in two diametrically opposite directions. Sporulation determination was performed by counting spores in a Neubauer chamber. The isolate Fusarium oxysporum f. sp. passiflorae 4 (FOP 4) was the most virulent. There was variation in the morphological characteristics of all the isolates. The starch provided the highest mycelial growth and the isolates showed preferences for a particular carbon source in the sporulation test.

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Published

2018-01-31

How to Cite

Catarino, A. de M., A. A. C. R. Machado Gois de Oliveira, and D. H. S. Gomes da Costa. “Morphological Aspects and Effect of Carbon Sources in the Physiology of Fusarium Oxysporum F. Sp. Passiflorae”. Emirates Journal of Food and Agriculture, vol. 30, no. 1, Jan. 2018, pp. 77-84, doi:10.9755/ejfa.2018.v30.i1.1588.

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