Search for dissertations about: "Ulla Rasmussen"

Showing result 6 - 8 of 8 swedish dissertations containing the words Ulla Rasmussen.

2. 6. Barley defense genes against aphids

   Author : Aleksandra Losvik; Lisbeth Jonsson; Ulla Rasmussen; Robert Glinwood; Bogumił Leszczyński; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Aphid resistance; protease inhibitor; lipoxygenase; induced plant resistance; volatiles; Hordeum vulgare; Rhopalosiphum padi; Myzus persicae; Plant Physiology; växtfysiologi;

   Abstract : Aphids are insect pests with major importance worldwide. By feeding from plant phloem, they directly withdraw nutrients. The feeding injury is often visible in the form of leaf rolling, chlorosis, necrosis or plant deformation. Their pest status is attributed also to vectoring of plant viruses. READ MORE

4. 7. Phylogeny, diversity and toxin production related to cyanobacterial symbioses

   Author : Dimitra Papaefthimiou; Ulla Rasmussen; Kaarina Sivonen; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Azolla; BMAA; cyanobacteria; cyanobionts; cyanolichens; diversity; HPLC; Nostoc; phylogeny; symbiosis; Plant physiology; Växtfysiologi; växtfysiologi; Plant Physiology;

   Abstract : Phylogeny and morphology were examined for the cyanobionts from the water fern Azolla and the cyanobacterial genus Nostoc originating from symbioses with different host plants (genera Gunnera, Cycas, Dioon, Encephalarthos, Macrozamia, and Anthoceros), the lichen genus Pannaria, and free-living Nostoc isolates from different habitats. Nostoc isolates of Pannaria formed a closely related group, but, in general, no monophyletic nature was attributed to the genus Nostoc, in contrast to the cyanobionts from Azolla which were contained in a unique monophyletic group. READ MORE

5. 8. Cyanobacteria in symbiosis with boreal forest feathermosses : from genome evolution and gene regulation to impact on the ecosystem

   Author : Denis Warshan; Ulla Rasmussen; Elke Dittmann; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Cyanobacteria; Feathermosses; Symbiosis; Boreal forest; Gene flow; Proteogenomic; Transcriptomic; Community structure and composition; Dinitrogen fixation; Plant Physiology; växtfysiologi;

   Abstract : Among dinitrogen (N2)-fixing some cyanobacteria can establish symbiosis with a broad range of host plants from all plant lineages including bryophytes, ferns, gymnosperms, and angiosperms. In the boreal forests, the symbiosis between epiphytic cyanobacteria and feathermosses Hylocomium splendens and Pleurozium schreberi is ecologically important. READ MORE