dc.contributor.advisor | Kļaviņa, Dārta | |
dc.contributor.author | Berena, Samanta | |
dc.contributor.other | Latvijas Universitāte. Bioloģijas fakultāte | |
dc.date.accessioned | 2024-06-20T01:03:55Z | |
dc.date.available | 2024-06-20T01:03:55Z | |
dc.date.issued | 2024 | |
dc.identifier.other | 102963 | |
dc.identifier.uri | https://dspace.lu.lv/dspace/handle/7/65969 | |
dc.description.abstract | Skujbiri izraisošās sēņu sugas rada būtiskus ekoloģiskus un ekonomiskus bojājumus Pinus sylvestris audzēs. Klimata pārmaiņu un globālās tirdzniecības dēļ šīs sugas kļūst arvien biežāk sastopamas arī Eiropas ziemeļos, tostarp Latvijā. Šajā darbā apskatītas Dothistroma septosporum, Dothistroma pini, Lecanosticta acicola un Diplodia sapinea sēņu sugas. Lai novērtētu šo sēņu sastopamību un skujbires simptomu intensitāti Pinus sylvestris jaunaudzēs, veikta audžu apsekošana visā Latvijas teritorijā. Audzēs kokiem noteikta skujbires intensitāte ballēs un ievākti simptomātisku skuju paraugi, kas analizēti mikroskopiski un ar molekulārām metodēm patogēnu noteikšanai. Sākotnēji 2021. gadā apsekotas 168 audzes, balstoties uz sugu sastopamību tajās, veikta atkārtota apsekošana 50 audzēs 2022. gadā, 30 no tām dinamiskai novērošanai veikti arī koku augstuma un diametra (1,3 m augstumā) mērījumi.. Pamatojoties uz skuju molekulāro analīžu rezultātiem par Lecanosticta acicola klātbūtni septiņu koku skuju paraugos, 2023. gadā veikta konkrēto koku apsekošana un parauglaukumu ierīkošana ap tiem, lai precizētu sugas sastopamību šajās jaunaudzēs. Visu apsekošanu ietvaros kopā mikroskopiski analizēti 563 paraugi un molekulāri - 353 paraugi. Pētījuma rezultāti liecina, ka biežāk sastopamā skujbiri izraisošā sēņu suga Latvijas teritorijā ir Dothistroma septosporum. Būtiska korelācija atrasta starp skujbires simptomu intensitāti un koku parametriem – augstumu un diametru 1,3 m augstumā. Lecanosticta acicola pirmo reizi novērota vietējās Pinus sylvestris jaunaudzēs, līdz šim suga Latvijā bija novērota tikai dekoratīvajos apstādījumos. | |
dc.description.abstract | Fungal species that cause needle cast result in significant ecological and economic damage to Pinus sylvestris stands. Due to climate change and global trade, these species are becoming increasingly common in northern Europe, including Latvia. This study examines Dothistroma septosporum, Dothistroma pini, Lecanosticta acicola and Diplodia sapinea species. In order to assess the occurrence of these fungi and the intensity of needle cast symptoms in young Pinus sylvestris stands, a survey of the stands was conducted throughout the territory of Latvia. On a stand level, the intensity of the needle cast symptoms was graded. For the detection of pathogens, samples of symptomatic needles were collected, which were later analyzed both microscopically and with molecular methods. Initially, 168 stands were surveyed in 2021, based on the occurrence of species in those stands, another survey was carried out in 50 of those stands in 2022, 30 of them were chosen for dynamic monitoring in which measurements of the height and diameter of the trees at a height of 1.3 m were taken. Based on the results of the molecular analyzes of these stands, trees with Lecanosticta acicola infection were chosen for further surveying in 2023. Circular plots were established around each of the infected trees to determine the spread of the fungi. Within this study, total of 563 samples were analyzed microscopically and 353 were analyzed with molecular methods. The results of the study show that the most common species of fungus that causes needle cast in the territory of Latvia is Dothistroma septosporum. A significant correlation was found between the intensity of needle cast symptoms and tree parameters - height and diameter at a height of 1.3 m. Lecanosticta was observed in native Pinus sylvestris stands, ntil now, the species has only been observed in decorative stands in urban areas. | |
dc.language.iso | lav | |
dc.publisher | Latvijas Universitāte | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.subject | Bioloģija | |
dc.subject | Fitopatoloģija | |
dc.subject | Skujbire | |
dc.subject | Lecanosticta acicola | |
dc.subject | Dothistroma septosporum | |
dc.subject | Dothistroma pini | |
dc.title | Skujas kolonizējošo invazīvo sēņu sastopamība un ekoloģija parastās priedes (Pinus sylvestris L.) jaunaudzēs Latvijā | |
dc.title.alternative | Occurrence and ecology of needle-colonizing invasive fungi in young Scots pine (Pinus sylvestris L.) stands in Latvia | |
dc.type | info:eu-repo/semantics/bachelorThesis | |