Home About Browse Search

Genetic variability and reproductive strategies in Nordic dogroses, Rosa section Caninae

Werlemark, Gun (1999). Genetic variability and reproductive strategies in Nordic dogroses, Rosa section Caninae. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Agraria, 1401-6249 ; 257
ISBN 91-576-5775-0
[Doctoral thesis]

[img] PDF


In the present thesis, I investigate the morphological variation among and within Nordic dogrose species (Rosa section Carzirzae), and the transmittal of morphological characters and molecular markers to interspecific progeny plants. The occurrence of apomixis within the section is also investigated. All species within section Caninae are polyploid and characterised by their unique meiosis with unequal distribution of maternal and paternal chromosomes to their progeny. The pollen parent contributes only seven chromosomes, whereas the seed parent contributes 21, 28 or 35 chromosomes depending on ploidy level. The dogrose species are morphologically rather distinct. Both reproductive and vegetative morphological characters could differentiate among the investigated taxa, with the exception of the two subspecies of R. dumalis, subsp. corifoliia and subsp. dumalis. Rosa rubiginosa appeared to be the most homogeneous of the species, both within and among populations, and R. dumalis the most heterogeneous, both within and among populations. Rosa villosa was heterogeneous among populations but showed high within-population homogeneity. Morphological characters could also separate interspecific hybrids from progeny groups representing the parental species and the influence from the seed parent was apparent as expected from the skewed distribution of chromosomes. The matroclinal inheritance of molecular markers is also very pronounced, since all but two maternal markers were transmitted to all the interspecific progeny plants. In contrast, only approximately half of the paternal markers were transmitted to the progenies. The degree of homology between the constituent genomes in the parents decide to what extent the genetic contribution of the pollen parent will be recognizable in the progeny plant, both in morphological characters and in molecular markers. The genomes could be separated by size polymorphism in their respective NOR sites. Apparently two of the five consituent genomes in one pentaploid plant were never involved in the bivalent formation. Apomixis appears to occur to a limited extent within the dogroses, indicated by elevated pollen via- bility compared to the experimentally derived hybrid plants, and a complete lack of paternal parent-specific molecular marke

Authors/Creators:Werlemark, Gun
Title:Genetic variability and reproductive strategies in Nordic dogroses, Rosa section Caninae
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Agraria
Year of publishing :January 1999
Number of Pages:33
ALLI. Werlemark G, Carlson-Nilsson U, Uggla M and Nybom H (1995) Effects of temperature treatments on seedling emergence in dogroses, Rosa sect. Caninae (L). Acta Agric. Scand: Sect. B, Soil and Plant Sci. 45: 278-282 II. Nybom H, Olsson A and Werlemark G (1996) Morphornetsic variation in Nordic dogroses (Rosa sect. Caninae, Rosaceae). Acta Univ. Ups. Symb. Bot. Ups. 31 : 59-68 III. Nybom H, Carlsoii-Nilssuii U. Werlemark G and Uggla M (1997) Different levels of morphometric variation in three heterogamous dogrose species (Rosa sect. Caninae, Rosaceae). Pl. Syst. Evol. 204: 207-224 IV. Werlemark G, Uggla M and Nybom H (1999) Morphological and RAPD markers show a highly skewed distribution in a pair of reciprocal crosses between hemisexual dogrose species, Rosa sect. Caninae. Theor. Appl. Genet. 98: 557-563 V. Werlemark G (2000) Evidence of apomixis in hemisexual dogroses, Rosa section Caninae. Sex. Plant Reprod. 12: 353-359 VI. Werlemark G and Nybom H. Skewed distribution of morphological character scores and molecular markers in three interspecific crosses in Rosa section Caninae (manuscript submitted) VII. Nybom H, Esselink D, Werlemark G and Vosman B. Inheritance of microsatellite DNA markers in hemisexual dogroses, Rosa L. sect. Canine (manuscript) VIII. Lim KY, Bringloe JB, Werlemark G, Meynet J , Roberts AV and Leitch AR. Molecular cytogenetic investigation in Rosa section Caninae (manuscript
Place of Publication:Alnarp
ISBN for printed version:91-576-5775-0
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F63 Plant physiology - Reproduction
Subjects:Not in use, please see Agris categories
Agrovoc terms:rosa, genetic variation, apomixis, hybridization, scandinavia
Keywords:Rosa sect. Caninae, Rosaceae, genetic diversity, matroclinal inheritance, apomixis, RAPD, microsatellites, in situ hybridization
Permanent URL:
ID Code:44
Department:?? 4040 ??
Deposited By: Staff Epsilon
Deposited On:04 Jun 2002 00:00
Metadata Last Modified:02 Dec 2014 10:01

Repository Staff Only: item control page


Downloads per year (since September 2012)

View more statistics