Characterization of Fusarium nirenbergiae and F. elaeidis causing diseases on Dipladenia and Grevillea plants

Characterization of Fusarium nirenbergiae and F. elaeidis causing diseases on Dipladenia and Grevillea plants

During 2019, severe symptoms of crown, basal stem and root rot associated with vascular discoloration were observed on Dipladenia and Grevillea ornamental species in a nursery located in Southern Italy. Fusarium spp. colonies were consistently recovered from infected tissues on semi-selective media....

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Bibliographic Details
Published in:European journal of plant pathology Vol. 162; no. 4; pp. 885 - 896
Main Authors: Aiello, Dalia, Gusella, Giorgio, Vitale, Alessandro, Polizzi, Giancarlo
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01-04-2022
Springer Nature B.V
Subjects:
Agriculture
Biomedical and Life Sciences
Cultivars
Cuttings
Discoloration
DNA-directed RNA polymerase
Ecology
Elongation
Fungi
Fusarium
Grevillea
Inoculation
Life Sciences
Nurseries
Ornamental plants
Pathogenicity
Pathogens
Phylogeny
Plant Pathology
Plant Sciences
RNA polymerase
Root rot
Selective media
Signs and symptoms
Ornamental species
spp
Disease susceptibility
Phylogeny
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Summary:During 2019, severe symptoms of crown, basal stem and root rot associated with vascular discoloration were observed on Dipladenia and Grevillea ornamental species in a nursery located in Southern Italy. Fusarium spp. colonies were consistently recovered from infected tissues on semi-selective media. Molecular and phylogenetic analyses of the internal transcribed spacer (ITS) of rDNA, RNA polymerase second largest subunit ( RPB2 ) and elongation factor 1-alpha ( tef1 -α) regions allowed to identify F. nirenbergiae and F. elaeidis as causal agents of infections from Dipladenia Sundaville® and Grevillea gracilis, respectively. The pathogenicity of both fungi was confirmed on young pot-grown cuttings of two ornamental plants, where they reproduced symptoms very similar to those observed in the nursery. Re-isolation of fungi from symptomatic tissues definitively confirmed aetiology of infections. In addition, among tested Dipladenia cultivars, “Classic Red” showed the significant highest percentage of disease incidence (almost 40% of plants) one month post inoculation. Similarly, disease occurrence recorded on young cuttings G. gracilis reached the maximum level 20 days after inoculation, interesting 100% of plants. This study reports the occurrence of Fusarium nirenbergiae and F. elaeidis causing diseases on Dipladenia and Grevillea plants.
ISSN:0929-1873
1573-8469
DOI:10.1007/s10658-021-02444-z