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Authors Haapalainen

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Haapalainen, Minna


Publications
6

CitationNamesAbstract
Landscape epidemiology of an insect-vectored plant-pathogenic bacterium: Candidatus Liberibacter solanacearum in carrots in Finland Nissinen et al. (2022). Agriculture, Ecosystems & Environment 339 “Liberibacter solanacearum”
Dual Transcriptional Profiling of Carrot and ‘Candidatus Liberibacter solanacearum’ at Different Stages of Infection Suggests Complex Host-Pathogen Interaction Wang et al. (2021). Molecular Plant-Microbe Interactions® 34 (11) “Liberibacter solanacearum”
Spreading of Trioza apicalis and development of “ Candidatus Liberibacter solanacearum” infection on carrot in the field conditions Nissinen et al. (2020). Annals of Applied Biology 178 (1) “Liberibacter solanacearum”
A novel haplotype of ‘Candidatus Liberibacter solanacearum’ found in Apiaceae and Polygonaceae family plants Haapalainen et al. (2019). European Journal of Plant Pathology 156 (2) “Liberibacter solanacearum”
Carrot Pathogen ‘Candidatus Liberibacter solanacearum’ Haplotype C Detected in Symptomless Potato Plants in Finland Haapalainen et al. (2018). Potato Research 61 (1) “Liberibacter solanacearum”
Genomic sequence of 'Candidatus Liberibacter solanacearum' haplotype C and its comparison with haplotype A and B genomes Wang et al. (2017). PLOS ONE 12 (2) “Liberibacter solanacearum”

Dual Transcriptional Profiling of Carrot and ‘Candidatus Liberibacter solanacearum’ at Different Stages of Infection Suggests Complex Host-Pathogen Interaction
The interactions between the phloem-limited pathogen ‘Candidatus Liberibacter solanacearum’ haplotype C and carrot (Daucus carota subsp. sativus) were studied at 4, 5, and 9 weeks postinoculation (wpi), by combining dual RNA-Seq results with data on bacterial colonization and observations of the plant phenotype. In the infected plants, genes involved in jasmonate biosynthesis, salicylate signaling, pathogen-associated molecular pattern- and effector-triggered immunity, and production of pathogenesis-related proteins were up-regulated. At 4 wpi, terpenoid synthesis-related genes were up-regulated, presumably as a response to the psyllid feeding, whereas at 5 and 9 wpi, genes involved in both the terpenoid and flavonoid production were down-regulated and phenylpropanoid genes were up-regulated. Chloroplast-related gene expression was down-regulated, in concordance with the observed yellowing of the infected plant leaves. Both the RNA-Seq data and electron microscopy suggested callose accumulation in the infected phloem vessels, likely to impair the transport of photosynthates, while phloem regeneration was suggested by the formation of new sieve cells and the upregulation of cell wall–related gene expression. The ‘Ca. L. solanacearum’ genes involved in replication, transcription, and translation were expressed at high levels at 4 and 5 wpi, whereas, at 9 wpi, the Flp pilus genes were highly expressed, suggesting adherence and reduced mobility of the bacteria. The ‘Ca. L. solanacearum’ genes encoding ATP and C4-dicarboxylate uptake were differentially expressed between the early and late infection stages, suggesting a change in the dependence on different host-derived energy sources. HPE1 effector and salicylate hydroxylase were expressed, presumably to suppress host cell death and salicylic acid-dependent defenses during the infection. [Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license .
A novel haplotype of ‘Candidatus Liberibacter solanacearum’ found in Apiaceae and Polygonaceae family plants
AbstractA previously unknown haplotype of the plant pathogen ‘Candidatus Liberibacter solanacearum’ (Lso) was found in cultivated carrots and parsnips in eastern Finland. That same haplotype was found in western Finland, over 300 km away, in the family Polygonaceae, the species Fallopia convolvulus (wild buckwheat) and Persicaria lapathifolia (pale persicaria) growing as weeds within carrot and parsnip fields. The infected plants, both apiaceous and polygonaceous, showed symptoms of foliar discolouration. This is the first report of Lso bacteria in plants of the family Polygonaceae. The finding that the polygonaceous plants infected with a previously unknown haplotype of Lso were growing among the apiaceous plants infected with Lso haplotype C suggests that these two haplotypes might be transmitted by different vectors. Phylogenetic analyses showed that the new haplotype, called haplotype H, is distinct from the previously characterized haplotypes and appears to have diverged early from their common ancestor. Multi-locus sequence analysis revealed four different sequence types (strains) within the haplotype H. These findings suggest that the haplotype H is likely to be endemic in northern Europe and that the genetic diversity within the Lso species is higher than previously assumed.
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