Gustaf Otto Rosenberg, termed Otto Rosenberg in publications, born June 9, 1872 in

Gothenburg Gothenburg (; abbreviated Gbg; sv, Göteborg ) is the second-largest city in Sweden, fifth-largest in the Nordic countries, and capital of the Västra Götaland County. It is situated by the Kattegat, on the west coast of Sweden, and has ...

Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...

, died November 30, 1948, was a Swedish botanist; son of Johan Olof Rosenberg. Rosenberg studied in

Uppsala Uppsala (, or all ending in , ; archaically spelled ''Upsala'') is the county seat of Uppsala County and the List of urban areas in Sweden by population, fourth-largest city in Sweden, after Stockholm, Gothenburg, and Malmö. It had 177,074 inha ...

Stockholm Stockholm () is the Capital city, capital and List of urban areas in Sweden by population, largest city of Sweden as well as the List of urban areas in the Nordic countries, largest urban area in Scandinavia. Approximately 980,000 people liv ...

and

Bonn The federal city of Bonn ( lat, Bonna) is a city on the banks of the Rhine in the German state of North Rhine-Westphalia, with a population of over 300,000. About south-southeast of Cologne, Bonn is in the southernmost part of the Rhine-Ruhr r ...

, he gained a bachelor's degree at the

University of Uppsala Uppsala University ( sv, Uppsala universitet) is a public research university in Uppsala, Sweden. Founded in 1477, it is the oldest university in Sweden and the Nordic countries still in operation. The university rose to significance during ...

in 1895, and a PhD in

in 1899 where he studied under

Eduard Strasburger Eduard Adolf Strasburger (1 February 1844 – 18 May 1912) was a Polish-German professor and one of the most famous botanists of the 19th century. He discovered mitosis in plants. Life Eduard Strasburger was born in Warsaw, Congress Poland, the ...

(1844–1912). His PhD thesis addressed the cytological changes that occur in the cells of the Sundew plant (''

Drosera ''Drosera'', which is commonly known as the sundews, is one of the largest genus, genera of carnivorous plants, with at least 194 species. 2 volumes. These members of the family Droseraceae lure, capture, and digest insects using stalked mucil ...

'') when they are irritated. Also in 1899, he became an associate professor of Botany at the University of Stockholm. Rosenberg worked at the Botanical Institute in Stockholm from 1904 and was promoted to a professorship in plant anatomy and cytology in 1911, at the same university. Later, Rosenberg studied meiosis in the hybrid of ''Drosera longifolia'' crossed with ''D. rotundifolia'', this was the first cytologically examined plant hybrid. The former of the two parent species contained 40 chromosomes, the latter 20; however, the near-sterile hybrid (''D. obovata'') contained 30 chromosomes. This ''Drosera'' 'scheme’ was almost certainly the first example of the parents of a hybrid being identified through the analysis of chromosome pairing during

meiosis Meiosis (; , since it is a reductional division) is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells. It involves two rounds of division that ultimately resu ...

.ROSENBERG, O. 1909b. Cytologische und morphologische Studien an Drosera longifolia x rotundifolia. Kungliga Svenska Vetenskaps-Akademiens Skrifter Naturskyddsarenden Handlingar, 43: 1-64. Rosenberg's writings dealt mainly in cytology and plant embryology and he became very prominent in these fields. In 1917 he was elected a member of the

Royal Swedish Academy of Sciences The Royal Swedish Academy of Sciences ( sv, Kungliga Vetenskapsakademien) is one of the Swedish Royal Academies, royal academies of Sweden. Founded on 2 June 1739, it is an independent, non-governmental scientific organization that takes special ...

and, in 1925, a member of the

Royal Danish Academy of Sciences and Letters {{Infobox organization , name = The Royal Danish Academy of Sciences and Letters , full_name = , native_name = Det Kongelige Danske Videnskabernes Selskab , native_name_lang = , logo = Royal ...

. Rosenberg became a Commander of the

Order of the Polar Star The Royal Order of the Polar Star (Swedish: ''Kungliga Nordstjärneorden'') is a Swedish order of chivalry created by King Frederick I on 23 February 1748, together with the Order of the Sword and the Order of the Seraphim. The Order of the ...

, November 22, 1932.

References

{{DEFAULTSORT:Rosenberg, Otto 1872 births 1948 deaths People from Gothenburg Swedish botanists University of Bonn alumni Swedish scientists