Sökning: "internal transcribed spacer"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden internal transcribed spacer.

  1. 1. Disentangling the Reticulate History of Polyploids in Silene (Caryophyllaceae)

    Författare :Magnus Popp; Bengt Oxelman; Magnus Lidén; Jeff J. Doyle; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Silene; Sileneae; polyploidy; low copy nuclear DNA; RNA polymerase; RPA2; RPB2; RPD2; internal transcribed spacer; rps16; psbE-petL; concerted evolution; reticulate evolution; lineage sorting; Biologi; Biology; Biologi;

    Sammanfattning : DNA sequences from the rps16 intron and the psbE-petL spacer from the chloroplast genome, the ribosomal nuclear ITS region, and introns from the low copy nuclear genes RPA2, RPB2, RPD2a and RPD2b, are in different combinations used to infer phylogenetic relationships in Sileneae (Caryophyllaceae). Used in concert, the biparentally inherited nuclear regions are useful to distinguish between paralogy due to allopolyploidy and single gene duplications, respectively, because the latter are not expected to give rise to repeated phylogenetic patterns in potentially unlinked sequence regions. LÄS MER

  3. 2. Phylogenetics of the genus sorghum, genetic diversity and nutritional value of its cultivated species

    Författare :Dickson Ng'uni; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Sorghum (Sorghum bicolor (L.) Moench) ranks fifth among cereal crops and second highest in production after maize in Africa particularly in the semi arid regions where it is a food security crop. LÄS MER

  4. 3. Stem canker and dieback disease on Grevillea robusta Cunn ex R. Br : distribution, causes and implications systems in agroforestry systems in Kenya

    Författare :Jane Wangu Njuguna; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : A widespread stem canker and dieback disease threatened the cultivation of Grevillea robusta on farms in Kenya. Disease index increased from 18% in the humid zone to 67% in the semi-arid zones and strongly correlated with altitude and length of drought period in the zones. LÄS MER

  5. 4. Filamentous fungi in wrapped forages

    Författare :Jessica Schenck; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Wrapped forages of higher dry matter (DM) concentrations (> 50 %), also referred to as haylage are common in Sweden and Norway. Such forages are preserved by a combination of semi-drying and anaerobic storage leading to an environment that may affect the composition of filamentous fungi differently than in hay or silage. LÄS MER

  7. 5. Dieback of Fraxinus excelsior : biology of ash dieback and genetic variation of the fungus Hymenoscyphus pseudoalbidus

    Författare :Stina Bengtsson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Ash dieback caused by Hymenoscyphus pseudoalbidus (anamorph Chalara fraxinea) is a disease that has emerged during the past twenty years. It was first observed in Poland and has expanded over most of the distribution area of European ash (Fraxinus excelsior) in Europe. This thesis comprises four scientific papers. LÄS MER