Abiotic stress and plant-microbe interactions in Norway spruce
Norway spruce (Picea abies) is a dominant tree species in boreal forests with extensive ecological and economic value. Climate change is threatening these ecosystems, with rising temperatures impacting cold hardening and increasing drought stress in regions experiencing lower precipitation. Increasi...
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Umeå universitet, Institutionen för fysiologisk botanik
2018
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ftumeauniv:oai:DiVA.org:umu-152835 2023-10-09T21:54:36+02:00 Abiotic stress and plant-microbe interactions in Norway spruce Haas, Julia Christa 2018 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-152835 eng eng Umeå universitet, Institutionen för fysiologisk botanik Umeå : Umeå University http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-152835 urn:isbn:978-91-7601-970-2 info:eu-repo/semantics/openAccess Norway spruce boreal forest cold drought bacteria fungi plant-microbe interactions climate change Botany Botanik Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2018 ftumeauniv 2023-09-22T13:50:39Z Norway spruce (Picea abies) is a dominant tree species in boreal forests with extensive ecological and economic value. Climate change is threatening these ecosystems, with rising temperatures impacting cold hardening and increasing drought stress in regions experiencing lower precipitation. Increasing atmospheric CO2 concentrations and nitrogen deposition can, in contrast, partially offset such negative effects by improving tree growth and carbon uptake. Similar to aboveground carbon fixation, carbon sequestration in boreal soils is important. Bacteria and fungi mineralize organic matter and, by making nutrients available for plants, are important for tree health. The ability of Norway spruce and the associated microbiota to adapt to climate change is of fundamental importance for ecosystem functioning and is the focus of this thesis. Norway spruce seedlings were subjected to cold or drought stress and the transcriptional response compared to known mechanisms in the model plant Arabidopsis thaliana. Analyses revealed that while there was overlap in the stress responses between species, including increased osmotic and oxidative stress tolerance, the majority of differentially expressed genes were stress-responsive only in Norway spruce. Importantly, transcription factors of the abscisic acid dependent and independent pathways were not differentially expressed or were missing homolog sequences in Norway spruce, indicating that different regulatory pathways are active in Norway spruce and suggesting that stress response has evolved differently in the species. Furthermore, differential gene expression in roots differed extensively from that of needles in response to stress and highlighted the need for separate profiling in above- and belowground tissues. In another study at the Flakaliden research site in northern Sweden, the effects of long-term nutrient addition on the microbiota associated with mature Norway spruce were tested. In agreement with earlier findings, nutrient addition improved tree growth and ... Doctoral or Postdoctoral Thesis Northern Sweden Umeå University: Publications (DiVA) Norway |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
Norway spruce boreal forest cold drought bacteria fungi plant-microbe interactions climate change Botany Botanik |
spellingShingle |
Norway spruce boreal forest cold drought bacteria fungi plant-microbe interactions climate change Botany Botanik Haas, Julia Christa Abiotic stress and plant-microbe interactions in Norway spruce |
topic_facet |
Norway spruce boreal forest cold drought bacteria fungi plant-microbe interactions climate change Botany Botanik |
description |
Norway spruce (Picea abies) is a dominant tree species in boreal forests with extensive ecological and economic value. Climate change is threatening these ecosystems, with rising temperatures impacting cold hardening and increasing drought stress in regions experiencing lower precipitation. Increasing atmospheric CO2 concentrations and nitrogen deposition can, in contrast, partially offset such negative effects by improving tree growth and carbon uptake. Similar to aboveground carbon fixation, carbon sequestration in boreal soils is important. Bacteria and fungi mineralize organic matter and, by making nutrients available for plants, are important for tree health. The ability of Norway spruce and the associated microbiota to adapt to climate change is of fundamental importance for ecosystem functioning and is the focus of this thesis. Norway spruce seedlings were subjected to cold or drought stress and the transcriptional response compared to known mechanisms in the model plant Arabidopsis thaliana. Analyses revealed that while there was overlap in the stress responses between species, including increased osmotic and oxidative stress tolerance, the majority of differentially expressed genes were stress-responsive only in Norway spruce. Importantly, transcription factors of the abscisic acid dependent and independent pathways were not differentially expressed or were missing homolog sequences in Norway spruce, indicating that different regulatory pathways are active in Norway spruce and suggesting that stress response has evolved differently in the species. Furthermore, differential gene expression in roots differed extensively from that of needles in response to stress and highlighted the need for separate profiling in above- and belowground tissues. In another study at the Flakaliden research site in northern Sweden, the effects of long-term nutrient addition on the microbiota associated with mature Norway spruce were tested. In agreement with earlier findings, nutrient addition improved tree growth and ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Haas, Julia Christa |
author_facet |
Haas, Julia Christa |
author_sort |
Haas, Julia Christa |
title |
Abiotic stress and plant-microbe interactions in Norway spruce |
title_short |
Abiotic stress and plant-microbe interactions in Norway spruce |
title_full |
Abiotic stress and plant-microbe interactions in Norway spruce |
title_fullStr |
Abiotic stress and plant-microbe interactions in Norway spruce |
title_full_unstemmed |
Abiotic stress and plant-microbe interactions in Norway spruce |
title_sort |
abiotic stress and plant-microbe interactions in norway spruce |
publisher |
Umeå universitet, Institutionen för fysiologisk botanik |
publishDate |
2018 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-152835 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-152835 urn:isbn:978-91-7601-970-2 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1779318234181271552 |