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1.
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: 14; Downloads: 5
.pdf Full text (3,04 MB)
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In memoriam : Janez Ponikvar (1940–2021)
Vili Potočnik, 2022, popular article

Published in DiRROS: 11.08.2022; Views: 17; Downloads: 4
.pdf Full text (140,92 KB)

4.
Upravljanje z mestnimi gozdovi postaja vse aktualnejši izziv slovenskih mest
Tina Simončič, Matjaž Guček, Jurij Kobe, 2022, professional article

Keywords: mestni gozdovi, upravljanje z gozdovi, Slovenija
Published in DiRROS: 11.08.2022; Views: 15; Downloads: 9
.pdf Full text (96,37 KB)

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Namnožitev bukovega rilčkarja skakača in bukove listne uši v letu 2022
Marija Kolšek, 2022, professional article

Keywords: varstvo gozdov, hrošči, bukev, bukov rilčkar skakač, bukova listna uš, hiranje
Published in DiRROS: 11.08.2022; Views: 9; Downloads: 4
.pdf Full text (147,39 KB)

7.
Izpust risa Bliska in praznovanje 30-letnice programa LIFE
Maja Sever, 2022, popular article

Keywords: ris, doselitev, Slovenija, gospodarjenje z divjadjo
Published in DiRROS: 11.08.2022; Views: 8; Downloads: 6
.pdf Full text (192,15 KB)

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Rast in kakovost metasekvoje (Metasequoia glyptostroboides Hu et Cheng) v živem arhivu pri Ljubljani
Iza Petek, Gregor Božič, Dušan Jurc, Maja Jurc, Kristjan Jarni, Robert Brus, 2022, original scientific article

Abstract: Analizirali smo živi arhiv metasekvoje (Metasequoia glyptostroboides Hu et Cheng) na obrečnem rastišču ob Savi pri Ljubljani. Osnovan je bil v letih 1993 in 1994 s sadikami, vzgojenimi iz originalnih semen z območja na Kitajskem, kjer je bila vrsta opisana (klasično nahajališče oz. locus classicus). Drevesa v nasadu so bila prvič izmerjena spomladi leta 2000 in nato še leta 2006, spomladi v letu 2020 pa smo meritve ponovili. V starosti 30 let je povprečno drevo merilo v višino 20,7 m, povprečni premer koreninskega vratu na višini debla 0,1 m je znašal 72,3 cm, povprečni premer debla na prsni višini pa 51,4 cm. Ugotovili smo, da je pogostnost reproduktivnih organov, torej storžev in moških cvetov, povezana s premerom in višino drevesa. Užlebljenost debla je zelo variabilna in povezana s premerom, zelo variabilno je tudi zmanjšanje premera z višino. Povezave med omenjenimi znaki in lego drevesa v nasadu nismo ugotovili. Svetloba oziroma lega v nasadu ni edini dejavnik, ki vpliva na lastnosti posameznega drevesa, vzrok je tudi genetska variabilnost med drevesi.
Keywords: Metasequoia glyptostroboides, semenski nasad, rast, kakovost, Slovenija
Published in DiRROS: 11.08.2022; Views: 7; Downloads: 7
.pdf Full text (694,92 KB)

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