Conventional Taxonomy (Wild Roses) ☆

Wissemann, Volker

doi:10.1016/b978-0-12-809633-8.05017-2

Cited by 26 publications

(33 citation statements)

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“…The genus Rosa L. comprises 200 species distributed widely throughout the temperate and subtropical regions of the northern hemisphere (Ku and Robertson, 2003;Rehder, 1940;Wissemann, 2003). However, less than 10 species have likely contributed to modern cultivated roses (Wylie, 1954).…”

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confidence: 99%

“…The genetic background of cultivated roses is, therefore, very narrow compared with the abundant germplasm resources available in this genus (Bruneau et al, 2007;Matsumoto et al, 1998). Genetic relationship studies within the genus based on morphology are difficult owing to intraspecific variability, polyploidy, and interspecific hybridization (Bruneau et al, 2007;Wissemann, 2003).…”

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confidence: 99%

“…Conventional taxonomy (Rehder, 1940;Wissemann, 2003) divides the genus into four subgenera: R. subgen. Hulthemia (Dumort.)…”

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Phylogenetic Relationships in the Genus Rosa Revisited Based on rpl16, trnL-F, and atpB-rbcL Sequences

Liu

Wang²,

Wang³

et al. 2015

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Three chloroplast DNA (cpDNA) sequences [the rpl16 intron, the trnL-F, and atpB-rbcL intergenic spacer (IGS)] were employed to study phylogenetic relationships in the genus Rosa. Phylogenetic analyses using these three concatenated sequences were performed using maximum parsimony (MP) and Bayesian inference (BI) methods. Both analyses results suggest that the molecular phylogeny conforms closely to the conventional classification of botanical sections. Morphological similarities between R. sects. Synstylae and Chinenses, and R. sects. Rosa and Carolinae are corroborated on the molecular level in our analyses. Four taxa from R. sect. Pimpinellifoliae are further divided into two small clades, which reflect the morphological characters for these species on a molecular level. Whereas three accessions of R. foetida from R. sect. Pimpinellifoliae form a separate clade. R. ×fortuniana forms a clade with R. laevigata based on its maternal inheritance of cpDNA. R. ×cooperii is hypothesized to be a hybrid with seed parent from R. sects. Synstylae and Chinenses. And R. roxburghii should be classified as a section within the R. subgen. Rosa, rather than being treated as its own subgenus, based on molecular analyses.

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Phylogenetic Relationships in the Genus Rosa Revisited Based on rpl16, trnL-F, and atpB-rbcL Sequences

Liu

Wang²,

Wang³

et al. 2015

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“…Rose is the most economically important ornamental crop worldwide because of its popularity as a garden, landscape and potted plant, and as cut flower (Gudin ). The genus Rosa subgenus Rosa comprises ten sections and more than 200 species (Wissemann , Fougère‐Danezan et al. ).…”

mentioning

confidence: 99%

“…Rose is the most economically important ornamental crop worldwide because of its popularity as a garden, landscape and potted plant, and as cut flower (Gudin 2000). The genus Rosa subgenus Rosa comprises ten sections and more than 200 species (Wissemann 2003, Foug ere-Danezan et al 2015. Ma€ ıa and Venard (1976) and Berninger (1992) showed that <10 species belonging to three sections are at the origin of roses (Rosa hybrida L.) cultivated today.…”

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Effect of high temperature on the production of 2n pollen grains in diploid roses and obtaining tetraploids via unilateral polyploidization

et al. 2015

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To integrate the gene pool of a wild species (primarily diploid) into a cultivated pool (primarily tetraploid), a crossing between a dihaploid cultivated rose and a hybrid of Rosa wichurana allowed to obtain interspecific diploid hybrids that produced 2n pollen grains. A return to a tetraploid level sought by breeders can then be considered using sexual polyploidization, obtained by crossing a tetraploid cultivated rose with these hybrids. Application of a high-temperature regime led to a small but significant increase in the percentage of 2n pollen grains in these hybrids of up to 4.6%. This result was obtained by applying high temperatures close to 32°C during the day to plants cultivated in a glasshouse during recurrent cycles of bloom. Crosses were made between an unreleased tetraploid hybrid tea rose, as a female, and the diploid hybrid that produces the most 2n pollen grains. Tetraploid (42.1%) and triploid (57.9%) offspring were obtained. The use of these 2n pollen grains of the first division restitution type should facilitate the introgression of complex traits of interest. Key words: 2n gametesRose is the most economically important ornamental crop worldwide because of its popularity as a garden, landscape and potted plant, and as cut flower (Gudin 2000). The genus Rosa subgenus Rosa comprises ten sections and more than 200 species (Wissemann 2003, Foug ere-Danezan et al. 2015. Ma€ ıa and Venard (1976) and Berninger (1992) showed that <10 species belonging to three sections are at the origin of roses (Rosa hybrida L.) cultivated today. Many cultivated roses are tetraploid (2n = 4x = 28), whereas many wild species are generally diploid (2n = 2x = 14).Rose breeders have attempted to enrich the variability of the gene pool of cultivated roses by introducing germplasm of new diploid wild species. Many interspecific hybridizations between tetraploid rose cultivars and wild diploid species were carried out, but produced triploids that were generally sterile, making it very difficult to generate additional generations (Wylie 1955). To integrate the variability of diploid species into the gene pool of cultivated roses, a haploidization programme of cultivated roses was developed in the 1990s by Meynet et al. (1994) that consisted of reducing the ploidy level of cultivated rose from tetraploid to diploid. This programme involved three steps: (i) producing dihaploids (diploid) from tetraploid rose cultivars, (ii) creating progeny of interspecific diploid hybrids developed by crossing dihaploid cultivated rose cultivars with wild diploid species and (iii) returning to the tetraploid level (ploidy level most frequently encountered in the cultivated rose) (Crespel and Meynet 2003).Only the first two steps of this programme were carried out. Dihaploids of tetraploid rose cultivars were obtained by parthenogenesis in situ induced by irradiated pollen and immature embryo rescue techniques in vitro (Meynet et al. 1994). The study of their gametogenesis revealed different meiotic anomalies such as abnormal spind...

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Ecological Distribution, Phytochemistry and Biological Properties of Rosa Species in Tunisia

et al. 2021

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Conventional Taxonomy (Wild Roses) ☆

Cited by 26 publications

References 2 publications

Phylogenetic Relationships in the Genus Rosa Revisited Based on rpl16, trnL-F, and atpB-rbcL Sequences

Phylogenetic Relationships in the Genus Rosa Revisited Based on rpl16, trnL-F, and atpB-rbcL Sequences

Effect of high temperature on the production of 2n pollen grains in diploid roses and obtaining tetraploids via unilateral polyploidization

Ecological Distribution, Phytochemistry and Biological Properties of Rosa Species in Tunisia

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