Considerações sobre o mecanismo da evolução

Brieger, F. G.

doi:10.1590/s0071-12761944000100009

Cited by 7 publications

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References 7 publications

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“…At Campinas, Carlos Krug who had moved from Piracicaba, taught genetics and started research on the genetics of coffee, which later brought to the Instituto Agronômico de Campinas an international reputation. Around 1940 they independently wrote papers on genetics and evolution, showing that they were acquainted with the available literature (Krug, 1940;Brieger, 1944). A name deeply important in this historical survey is that of André Dreyfus, not because he was a prominent researcher in genetics but instead, as a teacher of genetics and embryology since 1919 in Rio de Janeiro and from 1934 as the head of the Department of Biology in the newly founded University of São Paulo.…”

Section: Introductionmentioning

confidence: 99%

Spreading the evolutionary synthesis: Theodosius Dobzhansky and genetics in Brazil

Araújo

2004

Genet. Mol. Biol.

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The so-called Evolutionary Synthesis, the present paradigm for evolutionary explanations, was established during the 1920s, 1930s and 1940s. One of the leading scientists contributing to this was Theodosius Dobzhansky, a Russian born geneticist who emigrated to the United States of America in 1927 to study with Thomas Hunt Morgan. He was also responsible for the development of Drosophila genetics in Brazil, which was the main organism employed in experimental studies of evolution. Dobzhansky had several opportunities to visit Brazil starting in 1943, to do field and laboratory work as well as teaching. All these activities were fundamental in the spreading of new concepts, methodology, and objectives of the Synthesis to a new audience. This paper discusses the results of the interaction between Dobzhansky and a group of young Brazilian researchers, particularly from the University of São Paulo.

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Section: Introductionmentioning

confidence: 99%

Spreading the evolutionary synthesis: Theodosius Dobzhansky and genetics in Brazil

Araújo

2004

Genet. Mol. Biol.

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“…A importância do milho Tunicata para o problema da origem do milho foi discutida amplamente em alguns trabalhos recentes (MANGELSDORF e REEVES 1939, BRIEGER 1943, 1944a e b). Do ponto de vista da botânica, um estudo detalhado das inflorescências desta variedade dá resultados muito interessantes e que serão discutidos em outra publicação.…”

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Estudos genéticos sôbre o milho tunicata

Brieger¹

1945

An. Esc. Super. Agric. Luiz de Queiroz

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Estudos sôbre a inflorescência de milho com referência especial aos problemas filogenéticos

Brieger¹

1945

Bragantia

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1) The present paper deals with variations in the structure of the inflorescences of the Maydeae Americanae, especially of the ear of Zea Mays, which came under observation during our genetical studies during the last 10 years. Care was tauken to include only such structures which were observed frequently and had in general an aspect which could not be described as a pathological abnormality, but rather as a reversion to a phylogenetically primitive type or as a new form. The aberrations may be summarized as follows: a) Individual flowers. Eeversion to the hermaphrodite state of the usually unisexual flowers in Maydeae were described. Such flowers are however already so well known that no details need to be given. b) Many flowered spikelets. The spikelet in all the American Maydeae are normally two flowered. In forms of tunicata, obtained by selection, spikelets were obtained with up to three perfect flowers, all producing well developed kernels (Fig. 4-6), with a maximum of five flowers. The structure of three-flowered spikelets is explained in the diagrams Fig. 2 and 3. Owing to the organization of the flowers, the embryos of the first and third are turned towards the base of the inflorescence and the embryo of the second flower towards its tip. The embryos in two-flowered epike-lets are normally turned to the base (first flower) and to the tip (second flower). (Cutler, 10). Cases were observed of three flowered spikelets with one abortive flower, both the remaining embryos, produced by the first and third flower, turned towards the base of the inflorescence. c) Number of spikelets per alveolus. In maize and in the male parts of the inflorescences of Euchlaena and Tripsacum two spikelets are formed per alveolus, while in the female parts of the latter genera one spikelet is present, though occasionally exceptions are found. Collins (8) explained the appearance of the double spikelet as remainder of a small spikelet branch which has been lost during evolution. The normal structure and that of a spikelet branch is shown schematically in Fig. 3, e-f. In the tassels of several tunicata plants small and regular branches of spikelets appeared in the alveoli, their f

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Considerações sobre o mecanismo da evolução

Cited by 7 publications

References 7 publications

Spreading the evolutionary synthesis: Theodosius Dobzhansky and genetics in Brazil

Spreading the evolutionary synthesis: Theodosius Dobzhansky and genetics in Brazil

Estudos genéticos sôbre o milho tunicata

Estudos sôbre a inflorescência de milho com referência especial aos problemas filogenéticos

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