Abstract
Monosporascus root rot and vine decline of melon (MRRVD) is a destructive disease complex mainly occurring in semiarid cultivation areas. In the last decade, in the melon producing area of Sardinia (Italy), yield reductions up to 100% were recorded due to the occurrence of MRRVD. The present study aimed to undertake a two-year survey of fungal pathogens associated with MRRVD grown as a monocrop in two locations in Central Sardinia, Sinis, and Sassu, and to investigate the possible role of soil fungal diversity in the disease development. Melon plants were affected by similar symptoms but colonized by a set of soil-borne fungal pathogens different between surveyed sites and cropping seasons, including Plectosphaerella melonis, P. cucumerina, Fusarium solani, Macrophomina phaseolina and Monosporascus cannonballus. Olpidium bornovanus and O. virulentus were isolated using bait plants and detected by NGS analysis. Bait plants had a general decrease in biomass and yellowing of foliage. The presence of most of the isolated pathogens was also confirmed by the NGS analysis of the soil microbiome. Our results confirm that among the fungal complex implicated in the occurrence of RRVD in Sardinia, O. bornovanus along with O. virulentus likely assume a key role in the development of the disease alone and possibly in association with other pathogens. Differences in the pathogenic fungal spectrum here recorded in symptomatic roots may be associated with agricultural practices, soil physicochemical characteristics, and fungal community composition and function profile.
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Acknowledgements
This work was supported by a project grant from Regione Sardegna (delibera della Giunta Regionale n. 52/101). Authors thank Gianfranco Siddu (Op-Ortofrutta cooperativa produttori di Arborea) and Sandro Murru (Agenzia Laore Sardegna) for technical assistance in the on-field trials.
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Infantino, A., Balmas, V., Schianchi, N. et al. Diversity of soil-borne fungal species associated to root rot and vine decline of melon in Sardinia (Italy). J Plant Pathol 103, 421–432 (2021). https://doi.org/10.1007/s42161-021-00774-9
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DOI: https://doi.org/10.1007/s42161-021-00774-9