1942
DOI: 10.1098/rspb.1942.0004
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Abstract: When subjected to low temperature, certain segments of the chromosomes of Triton vulgaris , T. palmatus and T. cristatus are heterochromatic. At mitosis these segments are undercharged and at meiosis uncharged with nucleic acid. These segments show the same type of allocyclic behaviour as do similar segments in Paris , Trillium and Fritillaria . They form Feulgen-posit… Show more

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Cited by 46 publications
(5 citation statements)
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References 9 publications
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“…We now have consistent evidence from three genera of flowering plants, and from Triton (Callan, 1942), of large chromosomes with blocks of heterochromatin capable of cold-starvation.…”
Section: Evolution Of H-segmentsmentioning
confidence: 71%
“…We now have consistent evidence from three genera of flowering plants, and from Triton (Callan, 1942), of large chromosomes with blocks of heterochromatin capable of cold-starvation.…”
Section: Evolution Of H-segmentsmentioning
confidence: 71%
“…There is little need of elaboration of the wealth of evidence in support of this view. It comes both from the similarity in natural occurring phenomena, such as occurs in sex chromosomes and from a wide variety of observations elsewhere (Callan, 1942Levan, 1942Wickbom, ,945;La Cour, 5944;Koller, 1946;Darlington and La Cour, 1945). Not all heterochromatin, however, is influenced by treatment with cold.…”
Section: The Competition For Nucleic Acid Supplymentioning
confidence: 99%
“…Under the conditions of cold, heterochromatic parts become differentiated as segments of reduced diameter and, as shown with Feulgen, having a reduced nucleic acid charge (Darlington and La Cour, 1940Cour, , 1941Geitler, io ;Callan, 1942 ; i; Haga and Kurabayashi, 1948). The chromomere-like differentiation obtained with special fixation methods by Shmargon (1938) in Secale and by Kakhidze (i) in Crepis capillaris, has been compared with the differentiation produced by this nucleic acid starvation (Wilson and Boothroyd,1.4).…”
Section: Introductionmentioning
confidence: 99%
“…In animals, Callan (1942) observed that the heterochromatic segments appeared as constrictions after cold treatment in Triton meiotic chromosomes. Koller (1946) reported a differential segment of heterochromatin on the X-chromosome in the hamster, Cricetus auratus, which he attributed to winter condition (anoestrus), undernourishment, disease and old age, and therefore the differential reactivity of chromosome segments was physiologically conditioned.…”
mentioning
confidence: 99%