Genetic diversity and virulence variability in Diplodia mutila isolates from  symptomatic grapevines in New Zealand: Virulence and genetic diversity of Diplodia mutila

Jeyaseelan  Baskarathevan; E. Eirian Jones; Marlene V. Jaspers; Hayley J. Ridgway

doi:10.5073/vitis.2023.62.85-96

Genetic diversity and virulence variability in Diplodia mutila isolates from symptomatic grapevines in New Zealand

Virulence and genetic diversity of Diplodia mutila

Authors

Jeyaseelan Baskarathevan Ministry for Primary Industries https://orcid.org/0000-0002-5389-2570
E. Eirian Jones Lincoln University
Marlene V. Jaspers Lincoln University
Hayley J. Ridgway The New Zealand Institute for Plant & Food Research Ltd, https://orcid.org/0000-0002-0735-7649

DOI:

https://doi.org/10.5073/vitis.2023.62.85-96

Keywords:

anastomosis, Botryosphaeria stevensii, Botryosphaeriaceae, Diplodia mutila, pathogenicity, vegetative compatibility group, Vitis vinifera

Abstract

Genetic diversity and virulence variability of Diplodia mutila isolates recovered from grapevines in New Zealand were investigated. The universally primed PCR (UP-PCR) and vegetative compatibility group (VCG) methods were used to investigate the genetic diversity. Pathogenicity tests with ‘Sauvignon Blanc’ detached shoots and potted vines were used to determine the virulence diversity. UP-PCR analysis determined eight genetic groups of D. mutila with 70% of the population within one group. Phylogenetic analysis also determined that New Zealand isolates were more closely related to Australian isolates than Californian isolates. Vegetative compatibility grouping analysis placed the isolates into three VCG groups, with 57% of isolates belonging to all three VCGs. Vegetative compatibility reactions were observed among isolates, but this was not correlated with the genetic clustering. Virulence assays proved that all isolates tested were pathogenic on grapevine stems. Differences in necrotic lesions lengths caused by D. mutila isolates were identified, indicating different virulence levels among isolates, however, no relationship was found between the genetic groups and the virulence. The results of the study indicated movement of D. mutila isolates between nurseries, vineyards, and other sources in New Zealand. This information will inform control strategies to limit the further spread of this pathogen into vineyards in the same region or new regions.

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Published

2023-05-24

Issue

Vol. 62 No. 2 (2023): Vitis

Section

Article

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