Relationship and genetic structure among autoecious and heteroecious populations of Cronartium pini in northern Fennoscandia

Samils, Berit; Kaitera, Juha; Persson, Torgny; Stenlid, Jan; Barklund, Pia

doi:10.1016/j.funeco.2020.101032

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…in Europe and Asia (CABI, 2020), while the rust is a quarantine species in North America (Kim et al, 2022). Cronartium pini causes severe damage especially on Pinus sylvestris L. in northern Fennoscandia (Kaitera, 2000;Samils et al, 2021;Wulff et al, 2012). In the 2000s, C. pini has caused severe losses especially on young Scots pine plantations in nutrient-rich soils (Wulff et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Variation of compounds in leaves of susceptible and resistant alternate hosts of Cronartium pini and C. ribicola

et al. 2023

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Leaf compounds may contribute to plant defense against Cronartium rusts. Secondary compounds are either natural or induced in leaves. We studied the variation of compounds in leaves of six alternate hosts of Cronartium pini and two of C. ribicola that represented either susceptible or resistant species to these rusts. Extracts from the plant leaves were analyzed using LC-MSMS (liquid chromatography tandem mass spectrometry) and compounds were compared between susceptible and resistant species of the same plant genera to identify significant differences between resistant and susceptible species. Also, LC–MS (liquid chromatography mass spectrometry) with external calibration was used to quantify 12 candidate compounds known from the literature. Among these compounds, the most abundant significant ones in C. pini -resistant Melampyrum pratense were chlorogenic acid and quercitrin, in Veronica chamaedrys ferulic acid, quercitrin and luteolin and in Impatiens glandulifera quercitrin, ferulic acid, kaempferol, rutin and hyperoside. In C. ribicola -resistant Ribes rubrum the most abundant significant compounds were caffeic acid, p-coumaric acid and quercitrin. Among all extracted leaf compounds, concentrations of three compounds were over 1000 times greater in rust-resistant M. pratense, three compounds in V. chamaedrys, eight compounds in I. glandulifera, and one compound in R. rubrum than in rust-susceptible species. Among the compounds, the most promising possibly linked to rust resistance were chlorogenic acid and quercitrin.

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Section: Introductionmentioning

confidence: 99%

Variation of compounds in leaves of susceptible and resistant alternate hosts of Cronartium pini and C. ribicola

et al. 2023

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“…Monocultures reduce spatial challenges of dispersal and provide temporal opportunities of synchronised susceptible host material; pathogens that use asexual reproduction have increased epidemic potential in agricultural/horticultural environments (Drenth et al, 2019). Examples of pathogens on hosts in their native range that have benefited from monocultural propagation include species of Melampsora (poplar rusts), Cronartium (pine-gall rusts) and Dothistroma (pine needle blight), and Microcyclus ulei (rubber leaf blight) (Barrès et al, 2008;Barrès et al, 2012;Drenkhan et al, 2016;Samils et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Epidemic spread of smut fungi (Quambalaria) by sexual reproduction in a native pathosystem

et al. 2022

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Quambalaria are fungal pathogens of Corymbia, Eucalyptus and related genera of Myrtaceae. They are smut fungi (Ustilaginomycota) described from structures that resemble conidia and conidiophores. Whether these spore forms have asexual or sexual roles in life cycles of Quambalaria is unknown. An epidemic of Q. pitereka destroyed plantations of Corymbia in New South Wales and Queensland (Australia) in 2008. We sampled 177 individuals from three plantations of C. variegata and used AFLPs to test hypotheses that the epidemic was spread by asexual reproduction and dominated by a single genotype. There was high genotypic diversity across ≥600 AFLP loci in the pathogen populations at each plantation, and evidence of sexual reproduction based on neighbour-net analyses and rejection of linkage disequilibrium. The populations were not structured by host or location. Our data did not support a hypothesis of asexual reproduction but instead that Q. pitereka spreads exclusively by sexual reproduction, similar to life cycles of other smut fungi. Epidemics were exacerbated by monocultures of Corymbia established from seed collected from a single provenance. This study showcases an example of an endemic pathogen, Q. pitereka, with a strictly outbreeding life cycle that has caused epidemics when susceptible hosts were planted in large monoculture plantations.

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Rust diseases of forest trees

Hamelin

2022

Forest Microbiology

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Relationship and genetic structure among autoecious and heteroecious populations of Cronartium pini in northern Fennoscandia

Cited by 6 publications

References 31 publications

Variation of compounds in leaves of susceptible and resistant alternate hosts of Cronartium pini and C. ribicola

Variation of compounds in leaves of susceptible and resistant alternate hosts of Cronartium pini and C. ribicola

Epidemic spread of smut fungi (Quambalaria) by sexual reproduction in a native pathosystem

Rust diseases of forest trees

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