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Diversity, migration routes, and worldwide population genetic structure of Lecanosticta acicola, the causal agent of brown spot needle blight
Marili Laas, Kalev Adamson, Irene Barnes, Josef Janoušek, Martin S. Mullett, Katarína Adamčíková, Mitsuteru Akiba, Ludwig Beenken, Helena Bragança, Timur S. Bulgakov, Barbara Piškur, 2022, original scientific article

Abstract: Lecanosticta acicola is a pine needle pathogen causing brown spot needle blight that results in premature needle shedding with considerable damage described in North America, Europe, and Asia. Microsatellite and mating type markers were used to study the population genetics, migration history, and reproduction mode of the pathogen, based on a collection of 650 isolates from 27 countries and 26 hosts across the range of L. acicola. The presence of L. acicola in Georgia was confirmed in this study. Migration analyses indicate there have been several introduction events from North America into Europe. However, some of the source populations still appear to remain unknown. The populations in Croatia and western Asia appear to originate from genetically similar populations in North America. Intercontinental movement of the pathogen was reflected in an identical haplotype occurring on two continents, in North America (Canada) and Europe (Germany). Several shared haplotypes between European populations further suggests more local pathogen movement between countries. Moreover, migration analyses indicate that the populations in northern Europe originate from more established populations in central Europe. Overall, the highest genetic diversity was observed in south-eastern USA. In Europe, the highest diversity was observed in France, where the presence of both known pathogen lineages was recorded. Less than half of the observed populations contained mating types in equal proportions. Although there is evidence of some sexual reproduction taking place, the pathogen spreads predominantly asexually and through anthropogenic activity.
Keywords: brown spot needle blight, Lecanosticta acicola, pones, Pinus spp., popularion structure
Published in DiRROS: 12.08.2022; Views: 128; Downloads: 60
.pdf Full text (3,04 MB)
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Pomen analize dominantnih dreves za gozdnogospodarsko načrtovanje na primeru kisloljubnega bukovja z rebrenjačo
Andrej Bončina, 2022, original scientific article

Abstract: Poznavanje razvoja dominantnega drevja je pomembno za spremljavo razvoja enomernih sestojev, določanje režima redčenj, ciljnih premerov drevesnih vrst in optimalnega razmerja razvojnih faz ter ocenjevanje produkcijske sposobnosti gozdnih rastišč. S podatki stalnih vzorčnih ploskev smo analizirali debelinsko in višinsko rast dominantnih dreves petih drevesnih vrst kisloljubnega bukovja z rebrenjačo (smreka, bukev, graden, rdeči bor in kostanj). Za vrste smo ocenili rastiščni produkcijski indeks (SPI), ki je dominanta višina drevja pri prsnem premeru 45 cm, rastiščni indeks (SI) in prikazali postopek določanja optimalnega razmerja razvojnih faz glede na drevesno sestavo sestojev ter odločitev o ciljnih premerih drevja in pomlajevanju sestojev. Vrednosti SPI za bukev, smreko, graden, rdeči bor in kostanj so 28,4; 31,1; 25,1; 26,1 in 23,2, vrednosti SI pa 27,9; 32,5; 20,9; 22,9 in 21,7. Optimalni deleži razvojnih faz so odvisni od izbrane drevesne sestave gozdov ter odločitev glede ciljnih premerov in pomlajevanja sestojev. Model debelinskega priraščanja bukve kaže, da na njeno debelinsko rast pozitivno vplivajo prsni premer, produktivnost rastišča in raznomernost sestojev, negativno pa delež bukve v sestoju, sestojna temeljnica in naklon terena.
Keywords: višinska rast, debelinska rast, rastiščni indeks, rastiščni produkcijski indeks, Fagus sylvatica, Picea abies, Quercus petraea, Pinus sylvestris, Castanea sativa
Published in DiRROS: 11.08.2022; Views: 112; Downloads: 27
.pdf Full text (472,79 KB)

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