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Host-Pathogen Interactions / Interactions Hôte-Pathogène

First report of Ceratobasidium sp. AG-I (binucleate Rhizoctonia) causing root rot of Hedychium coronarium Koen in China

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Pages 168-175 | Accepted 20 Dec 2022, Published online: 02 Feb 2023
 

Abstract

Hedychium coronarium Koen is a perennial flowering plant that has ornamental, nutritional and medicinal value. In October 2019, root rot symptoms were observed in fields of H. coronarium in Yunnan Province, China. Fungal isolates were obtained from the diseased samples and the pathogenicity was confirmed by fulfilling Koch’s postulates using wounded and unwounded plant inoculations. The pathogen was identified as Ceratobasidium sp. (binucleate Rhizoctonia) through morphological characterization and anastomosis grouping as well as sequence analysis of both rDNA-ITS and EF-1α. To our knowledge, this is the first report of Ceratobasidium sp. AG-I (binucleate Rhizoctonia) causing root rot on H. coronarium.

Résumé

Hedychium coronarium Koen est une plante à fleurs vivace qui a une valeur ornementale, nutritionnelle et médicinale. En octobre 2019, des symptômes de pourriture des racines ont été observés dans des champs de H. coronarium dans la province du Yunnan, en Chine. Des isolats fongiques ont été obtenus à partir des échantillons malades et la pathogénicité a été confirmée en remplissant les postulats de Koch en utilisant des inoculations de plantes blessées et non blessées. L’agent pathogène a été identifié comme étant Ceratobasidium sp. (binucleate Rhizoctonia) grâce aux caractéristiques morphologiques, au regroupement des anastomoses ainsi qu’à l’analyse des séquences de l’ADNr-ITS et de l’EF-1α. A notre connaissance, il s’agit du premier signalement de Ceratobasidium sp. AG-I (binucleate Rhizoctonia) provoquant une pourriture des racines sur H. coronarium.

Acknowledgements

This work was supported by National Natural Science Foundation of China (31901929), and Fundamental Research Funds for the Central Universities (XDJK2020B015).

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [31901929]; Fundamental Research Funds for the Central Universities [XDJK2020B015].

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