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Morphometric and molecular variation in the Nordic dogroses (Rosa Sect. Caninae, Rosaceae)

Olsson, Åsa LU (1999)
Abstract
In the present thesis, I investigate the hierarchical structure of morphometric and molecular diversity within and between the Nordic dogroses (Rosa Sect. Caninae, Rosaceae). I also investigate patterns of geographic differentiation and taxonomic relationships within the group. The dogroses are characterized by a unique genetic system, the so-called ”canina meiosis” that leads to an uneven allocation of maternal and paternal chromosomes to the progeny and results in a largely matroclinal mode of inheritance. The partitioning of morphometric and molecular diversity in the investigated taxa was similar to that found in selfing or apomictic species. However, because of the matroclinal effects of the canina meiosis, the partitioning of... (More)
In the present thesis, I investigate the hierarchical structure of morphometric and molecular diversity within and between the Nordic dogroses (Rosa Sect. Caninae, Rosaceae). I also investigate patterns of geographic differentiation and taxonomic relationships within the group. The dogroses are characterized by a unique genetic system, the so-called ”canina meiosis” that leads to an uneven allocation of maternal and paternal chromosomes to the progeny and results in a largely matroclinal mode of inheritance. The partitioning of morphometric and molecular diversity in the investigated taxa was similar to that found in selfing or apomictic species. However, because of the matroclinal effects of the canina meiosis, the partitioning of morphometric and molecular diversity within the dogrose taxa cannot be simply interpreted in terms of different levels of selfing or apomixis. Most of the investigated Sect. Caninae taxa show a somewhat mosaic pattern of geographic differentiation between populations in both leaflet shape and reproductive characters. Two of the taxa (R. dumalis subsp. dumalis and R. rubiginosa) show weak geographic differentiation in one of the character sets: R. dumalis subsp. dumalis in leaflet shape and R. rubiginosa in reproductive characters. The Nordic dogroses can be divided into three distinct groups: the R. canina group, the R. rubiginosa group and the R. villosa group, on the basis of morphology and RAPD marker variation. Neither morphometric or molecular data support the present delimitation of subspecies within R. dumalis and the variation within R. dumalis might be better described at a lower rank than that of subspecies. Morphometric data support the current taxonomic separation between R. villosa subsp. mollis and R. sherardii and the varietal subdivision of R. sherardii. (Less)
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author
opponent
  • Prof Nordal, Inger, Oslo university
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Systematisk botanik, chemotaxonomy. Physiology of nonvascular plants, Genetic diversity, Geographic differentiation, Systematic botany, RAPDs, taxonomy, morphology, phytogeography, kemotaxonomi. Växters fysiologi (inte kärlväxter)., taxonomi, morfologi
pages
149 pages
publisher
Department of Systematic Botany, Östra Vallgatan 14-20, 223 61 Lund, Sweden
defense location
Ö. Vallgatan 14, Lund
defense date
1999-11-19 10:15
external identifiers
  • Other:ISRN: LUNBDS/(NBBS-1028)/1-149/1999
ISBN
91-628-3842-3
language
English
LU publication?
yes
id
29eed288-03d9-4dd1-a9fb-14629a4cac41 (old id 39970)
date added to LUP
2007-07-31 14:45:15
date last changed
2016-09-19 08:45:07
@misc{29eed288-03d9-4dd1-a9fb-14629a4cac41,
  abstract     = {In the present thesis, I investigate the hierarchical structure of morphometric and molecular diversity within and between the Nordic dogroses (Rosa Sect. Caninae, Rosaceae). I also investigate patterns of geographic differentiation and taxonomic relationships within the group. The dogroses are characterized by a unique genetic system, the so-called ”canina meiosis” that leads to an uneven allocation of maternal and paternal chromosomes to the progeny and results in a largely matroclinal mode of inheritance. The partitioning of morphometric and molecular diversity in the investigated taxa was similar to that found in selfing or apomictic species. However, because of the matroclinal effects of the canina meiosis, the partitioning of morphometric and molecular diversity within the dogrose taxa cannot be simply interpreted in terms of different levels of selfing or apomixis. Most of the investigated Sect. Caninae taxa show a somewhat mosaic pattern of geographic differentiation between populations in both leaflet shape and reproductive characters. Two of the taxa (R. dumalis subsp. dumalis and R. rubiginosa) show weak geographic differentiation in one of the character sets: R. dumalis subsp. dumalis in leaflet shape and R. rubiginosa in reproductive characters. The Nordic dogroses can be divided into three distinct groups: the R. canina group, the R. rubiginosa group and the R. villosa group, on the basis of morphology and RAPD marker variation. Neither morphometric or molecular data support the present delimitation of subspecies within R. dumalis and the variation within R. dumalis might be better described at a lower rank than that of subspecies. Morphometric data support the current taxonomic separation between R. villosa subsp. mollis and R. sherardii and the varietal subdivision of R. sherardii.},
  author       = {Olsson, Åsa},
  isbn         = {91-628-3842-3},
  keyword      = {Systematisk botanik,chemotaxonomy. Physiology of nonvascular plants,Genetic diversity,Geographic differentiation,Systematic botany,RAPDs,taxonomy,morphology,phytogeography,kemotaxonomi. Växters fysiologi (inte kärlväxter).,taxonomi,morfologi},
  language     = {eng},
  pages        = {149},
  publisher    = {ARRAY(0x8a6b7d0)},
  title        = {Morphometric and molecular variation in the Nordic dogroses (Rosa Sect. Caninae, Rosaceae)},
  year         = {1999},
}