Cultivar Resistance and Alternative Crops to Manage Fusarium Wilt in Lettuce Caused by Fusarium oxysporum f. sp. Lactucae Race 4 and the Emerging Race 4+ DOI

Hanna Mestdagh,

Tinne Dockx,

Isabel Vandevelde

et al.

Journal of Phytopathology, Journal Year: 2025, Volume and Issue: 173(3)

Published: May 1, 2025

ABSTRACT Fusarium wilt, caused by oxysporum f. sp. lactucae (Fol), poses a severe threat to butterhead lettuce ( Lactuca sativa L.) production in Europe. New isolates have broken through resistance Fol race 4 existing cultivars. Pathogenicity tests on differential cultivar set and genotyping revealed that the new are variants of 4, designated here as 4+. The differs its profile Secreted Xylem SIX ) genes: while both races contain SIX9 SIX14 , only contains SIX8 . spp. adapt quickly, which signals an urgent need develop effective integrated pest management (IPM) strategy for wilt. Crop rotation can play key role this strategy, especially during warmer periods when is most aggressive. Susceptibility 4+ root colonisation potential were assessed various types alternative vegetable crops. Most showed either susceptibility or intermediate resistance, but coral was resistant. crops asymptomatic grown soil infested with also did not support colonisation. However, artificially high concentrations, lamb's Valerianella locusta symptomatic. In naturally 4+, asymptomatic, latent growth (and potentially 4+) observed at levels comparable susceptible lettuce. results suggest wilt could involve cultivation resistant such rocket celery. During colder periods, cultivars may further reduce disease pressure allow occasional culture cultivar.

Language: Английский

Identification of candidate host-specificity genes in Exserohilum turcicum using comparative genomics and transcriptomics DOI Creative Commons
Mara J. Krone, Pragya Adhikari, Pummi Singh

et al.

G3 Genes Genomes Genetics, Journal Year: 2025, Volume and Issue: unknown

Published: April 11, 2025

Abstract Exserohilum turcicum causes northern corn leaf blight and sorghum blight. While the same species cause disease in both crops, strains are host-specific. Here, we report sequence de novo annotated assemblies of one sorghum- maize-specific E. strain. The were sequenced using PacBio Sequel II system. total genome length for was between 44 45 Mb with N50 ∼2.5 Mb. Ninety-eight percent Benchmarking Universal Single-Copy Orthologs (BUSCO) had complete status. estimated number genes 11,762 12,029 isolates, respectively. Funannotate, EffectorP, SignalP, transcriptome data used to create functional annotation each genome. whole-genome comparison identified ten large-scale inversions three translocations maize- sorghum-specific strains, along homologous gene duplications. RNA from isolate 10 days post-inoculation maize axenic cultures. Gene expression planta growth experiments compared Candidate host-specificity by combining results comparison, synteny analysis, annotations, data. Overall, this study several candidate that provide insights into interaction its hosts.

Language: Английский

Citations

0
Cultivar Resistance and Alternative Crops to Manage Fusarium Wilt in Lettuce Caused by Fusarium oxysporum f. sp. Lactucae Race 4 and the Emerging Race 4+ DOI

Hanna Mestdagh,

Tinne Dockx,

Isabel Vandevelde

et al.

Journal of Phytopathology, Journal Year: 2025, Volume and Issue: 173(3)

Published: May 1, 2025

ABSTRACT Fusarium wilt, caused by oxysporum f. sp. lactucae (Fol), poses a severe threat to butterhead lettuce ( Lactuca sativa L.) production in Europe. New isolates have broken through resistance Fol race 4 existing cultivars. Pathogenicity tests on differential cultivar set and genotyping revealed that the new are variants of 4, designated here as 4+. The differs its profile Secreted Xylem SIX ) genes: while both races contain SIX9 SIX14 , only contains SIX8 . spp. adapt quickly, which signals an urgent need develop effective integrated pest management (IPM) strategy for wilt. Crop rotation can play key role this strategy, especially during warmer periods when is most aggressive. Susceptibility 4+ root colonisation potential were assessed various types alternative vegetable crops. Most showed either susceptibility or intermediate resistance, but coral was resistant. crops asymptomatic grown soil infested with also did not support colonisation. However, artificially high concentrations, lamb's Valerianella locusta symptomatic. In naturally 4+, asymptomatic, latent growth (and potentially 4+) observed at levels comparable susceptible lettuce. results suggest wilt could involve cultivation resistant such rocket celery. During colder periods, cultivars may further reduce disease pressure allow occasional culture cultivar.

Language: Английский

Citations

0