AGROBIOLOGIA
Volume 13, Numéro 1, Pages 3361-3372
2023-07-01

Fusarium Brachygibbosum, Identification And Virulence As Causal Agents Of Crown Rot On Wheat



Authors : Bouanaka Hamza . Bellil Ines . Khelifi Douadi .

Abstract

Description of the subject: Fusarium crown rot (FCR) is one of the serious wheat diseases. Objective: The isolation of Fusarium brachygibbosum, which has recently described in the Algerian territory especially for wheat, and evaluation of its pathogenicity and capacity to induce FCR on wheat. Methods : In this study, one hundred and seventeen Fusarium symptomatic samples were collected from the northeast of Algeria. The 34 isolates obtained were identified based on morphological data and confirmed by molecular identification. Isolate FE10, identified as Fusarium brachygibbosum, was assigned the accession number MW450596 by NCBI GenBank. Two pathogenicity tests were conducted on 9 cultivars (cv) of bread wheat. The In vitro test in the host with the parameters; percentage of germination inhibition (%GI), to determine the impact on the germination of sowing seeds, and the Area Under the Disease Progress Curve (AUDPC) to test the effect on the initial infection of germinated coleoptiles. In vivo test in the growth chamber to test the F. brachygibbosum ability to induce FCR by the disease severity (DS) parameter. Results : The results showed that FE10 induced FCR at all tested cultivars with a significant decrease in germination rate and coleoptile emergence with GI% and AUDPC values reaching up to 17.36, and 38.86%, respectively for cv. Nif Encer. In addition F. brachygibbosum negatively affected the vegetative system length and fresh weight (RCL% and RCW%) up to 34.49 and 48.43%, respectively with cv. Arz. Conclusion : The moderate pathogenicity of F. brachygibbosum was observed in this study.

Keywords

Triticum aestivum; fungus ; phytopathology; wheat; Fusarium brachygibbosum .

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