Genetic variation within and between populations of Pinus sylvestris L. (Scots pine) for susceptibility to Melampsora pinitorqua Rostr. (pine twist rust)

Article Abstract:

Genetic variability of Scots pine (Pinus sylvestris L.) for twist rust susceptibility and prospects for genetic improvement of the species have been studied following artificial inoculation of 1-year-old seedlings in greenhouses. Wind-pollinated progenies, factorial and incomplete diallele mating designs were used to compare two natural populations of Scots pine in France and in Poland. Differences between the two natural populations in response to twist rust are apparently the result of local simultaneous adaptation for climatic conditions and pathogen pressure. Genetic improvements for resistance could be achieved quickly through intrapopulation mass or backward selection based on wind-pollinated progeny tests.

France, Poland, Physiological aspects, Plants, Plants (Organisms), Diseases and pests, Disease susceptibility, Rust diseases

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Multiple origins of Scots pine (Pinus sylvestris L.) in Scotland: evidence from mitchondrial DNA variation

Article Abstract:

Evidence from mitochondrial DNA variation of multiple origins of Scots pine (Pinus sylvestris L.) in Scotland is discussed. From 20 natural populations 466 trees were sampled, and a homologous probe for the cox1 mitochondrial gene of P. sylvestris was set up and used to find mtDNA RFLP variation with the finding that mitotype a is present in all sites but that mitotype b is in only three western populations, those mitotypes being common. It appears that this pine came from continental Europe via England and also migrated from a western refugium.

United Kingdom, Europe, Mitochondrial DNA, Population genetics, Paleobiogeography

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Variation in host resistance and pathogen selective value in the interaction between Pinus sylvestris and the fungus Crunemulopsis sororia

Article Abstract:

Research has been conducted on plant pathogen evolution in systems with gene-for-gene host resistance control. Genetically marked Crunemulopsis sororia isolates have been inoculated on 1- and 2-year old branch tissue of Pinus sylvestris, and the results have demonstrated that host resistance varies among populations.

Science & research, Fungi, Evolution (Biology), Evolution, Pathogenic microorganisms, Host-parasite relationships, Plant evolution

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