An histophotometrical evaluation of the DNA content in post-kinetic nuclei has been performed in the two karyological forms of Rattus rattus (L.), i.e. the Japanese one with 42 chromosomes complement and the European one with 38 chromosomes, and in Rattus norvegicus (Erxl.). Statistically significant differences have been demonstrated between the two chromosomal forms of Rattus rattus and this datum has been discussed in order to interpret the interrelationships between karyotypic transformation and DNA content variation. Hypotheses on the evolution of the karyotype within the subgenus Rattus Fisherand taxonomical speculations have also been proposed.
Referenze Bibliografiche
[1] N. O. BIANCHI, J. PAULETE-VANRELL e L. A. DE VIDAL RIOJA, Complement with 38 chromosomes in two South-American population of Rattus rattus, «Experientia», 25, 1111-1112 (1969).
[2] T. H. YOSIDA, K. TSUCHIYA, H. IMAI e K. MORIWAKI, New chromosome types of the black rat, Rattus rattus, collected in Oceania and F1 hybrids between Japanese and Australian Rats, «Jap. J. Genetics», 44, 89-91 (1969).
[3] H. S. YONG, Karyotypes of Malayan Rats, «Chromosoma», 27, 245-267 (1969).
[4] E. CAPANNA e M. V. CIVITELLI, An endemic population of Rattus rattus (L.) with a 38 chromosomes complement, «Mamm. Chrom. Newsletter», 10, 220-222 (1969).
[5] E. CAPANNA, M. V. CIVITELLI e R. NEZER, The Karyotype of the Black Rat (Rattus rattus L.). Another population with a 38 - Chromosomes complement, «Experientia», 26, 422-425 (1970).
[6] H. S. YONG, Centric fusion in the Malayan house rat Rattus rattus diardii, «Experientia», 27, 467-468 (1971).
[7] T. H. YOSIDA, A. NAKAMURA e T. FUKAYA, Chromosomal polymorphism in Rattus rattus (L.) collected in Kusudomari and Misima, «Chomosoma», 16, 70-78 (1965).
[8] T. H. YOSIDA, K. TSUCHIYA e K. MORIWAKI, Frequency of Chromosome Polymorphism in Rattus rattus Collected in Japan, «Chromosoma», 33, 30-40 (1971).
[9] H. S. YONG e S. S. DHALIWAL, Chromosomal polymorphysm in the Malayan house rat, Rattus (rattus) diardii (Jentik), «Mamm. chrom. Newsletter», 11, 30-33 (1970).
[10] A. GROPP, J. MARSHALL, G. FLATZ, M. OLBRICH, K. MANYANONDHA e A. SANTADUSIT, Chromosomen-polymorphismus durch überzählige Autosomen. Beobachtungen an der Hausratte (Rattus rattus), «Z. f. Suägertierkunde», 35, 363-371 (1970).
[11] E. CAPANNA e M. V. CIVITELLI, On the Chromosomic Polymorphism of Rattus rattus L. A study on West-European Population, «Experientia», 27, 383-384 (1971).
[12] E. CAPANNA e V. CIVITELLI, Karyological analysis of four African populations of Rattus rattus (L.); a statment of the problem of chromosomal polymorphism in the black rat, «Boll. Zool.», 28, in stampa (1971).
[13] E. CAPANNA e M. G. MANFREDI ROMANINI, Nuclear DNA Content and Morphology of the Karyotype in certain paleartic Microchiroptera, «Caryologia», 24, in stampa (1971); E. CAPANNA, G. SAVOIA e M. G. MANFREDI ROMANINI, Contenuto in DNA e area nucleare dei linfociti di alcune specie di Microchirotteri, «Boll. Zool.», 37 (1970).
[14] M. G. MANFREDI ROMANINI, M. MINAZZA e E. CAPANNA, DNA Nuclear Content in Lymphocytes from Mus musculus L. e Mus poschiavinus Fatio, «Boll. Zool.», 38.In stampa (1971).
[15] N. TAKAGI e S. MARINO, An autoradiographic study of the chromosomes of the with special regard to the sex chromosomes, «Chromosoma», 18, 359-370 (1966).
[16] J. R. ELLERMAN , The families and genera of living rodents. Vol. II Family Muridae (London 1941).
[17] G. GERZELI, Fondamenti per l'impiego dei preparati allestiti per apposizione e striscio in ricerche di citomorfologia e citochimica, «Studia Ghisleriana », ser. III, 2,103 (1955).
[18] K. NOESKE, Discrepancies between cytomorphometric Feulgen values and deoxyribonucleic acid content, «J. Histoch. Cytoch.», 19, 169-174 (1971).
[19] J. CHALINE e R. MATTHEY, Hypotheses relatives à la formule chromosomique d'Allophaiomys pliocaenicus (Rodentia-Arcicolidae) et à la diversification de cette espèce, «C. R. Acad. Sc. Paris», 272, 1071-1074 (1971).
Con il contributo del Ministero per i Beni e le Attività Culturali