Fungicide resistance and host influence on population structure in Botrytis spp. from specialty crops in California.

Botrytis is an important genus of plant pathogens causing pre- and post- harvest disease on diverse crops worldwide. This study evaluated Botrytis isolates collected from strawberry, blueberry, and table grape berries in California. Isolates were evaluated for resistance to eight different fungicides, and 60 amplicon markers were sequenced (neutral, species-identification, and fungicide-resistance associated) distributed across 15 of the 18 B. cinerea chromosomes. Fungicide resistance was common among the populations, with resistance to pyraclostrobin and boscalid being most frequent. Isolates from blueberry had resistance to the least number of fungicides, while isolates from strawberry had the highest number. Host and fungicide resistance-specific population structure explained, 12% and 7 to 26%, respectively of the population variability observed. Fungicide resistance was the major driver for population structure with select fungicides explaining up to 26% and resistance to multiple fungicides (MFR) explaining 17% of the variability observed. Shared and unique significant SNPs associated with host and fungicide resistance (fluopyram, thiabendazole, pyraclostrobin, and fenhexamid) associated population structure were identified. While overlap between host and fungicide-resistance SNPs were detected, unique SNPs suggest that both host and fungicide resistance play an important role in Botrytis population structure.

• Publication year

  2022

• Venue

  Phytopathology

• Publication date

  2022-07-08

• Fields of study

  Biology, Medicine, Environmental Science

• Identifiers
  DOI 10.1094/PHYTO-03-22-0070-RPMID 35801851
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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