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Abstract:

Twenty-four males of Cylindrotettix obscurus and ten of C. santarosae (Leptysminae, Acrididae) from Rio Claro, Brazil, were cytologically analysed. Both species are 2n = 23 ♂ (22+XO), all chromosomes being telocentric except for 4 acrocentric pairs of C. obscurus. Two different B-chromosomes were found in C. obscurus: (1) a small, mitotically unstable telocentric (BT) and (2) a medium-sized, mitotically stable submetacentric (B1). B1 has a large pericentromeric heterochromatic portion and two distal euchromatic segments where both terminal associations and interstitial chiasmata are regularly formed producing a ring univalent at prophase I. B1 is almost certainly an iso-chromosome which has undergone a centromeric shift through pericentric inversion or centric transposition (heterochromatin duplication or deletion could also be the cause of arm inequality). In C. santarosae, a single male carried a small mitotically stable telocentric B-chromosome. Both B types of C. obscurus significantly increased the production of abnormal sperm (diploid, tetraploid and micro-spermatids) when compared to 0B individuals although their effects were differential: BT induced higher frequencies of microspermatids especially in those follicles with odd BT numbers, while in B1 carriers the increase was chiefly due to polyploid spermatids. None of the Bs of C. obscurus affected cell mean chiasma frequency nor the between-cell variance. The B of C. santarosae had no effect on abnormal sperm production but it probably increased cell mean chiasma frequency. © 1986 Dr W. Junk Publishers.

Registro:

Documento: Artículo
Título:The B-chromosomes of two species of Cylindrotettix (Leptysminae, Acrididae)
Autor:Confalonieri, V.A.; Bidau, C.J.
Filiación:Becaria Conicet, Argentina
Laboratorio de Genética, Depto Ciencias Biológicas, Fac. Cs Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, Buenos Aires, 1428, Argentina
Año:1986
Volumen:68
Número:2
Página de inicio:87
Página de fin:95
DOI: http://dx.doi.org/10.1007/BF02424404
Título revista:Genetica
Título revista abreviado:Genetica
ISSN:00166707
CODEN:GENEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v68_n2_p87_Confalonieri

Referencias:

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Citas:

---------- APA ----------
Confalonieri, V.A. & Bidau, C.J. (1986) . The B-chromosomes of two species of Cylindrotettix (Leptysminae, Acrididae). Genetica, 68(2), 87-95.
http://dx.doi.org/10.1007/BF02424404
---------- CHICAGO ----------
Confalonieri, V.A., Bidau, C.J. "The B-chromosomes of two species of Cylindrotettix (Leptysminae, Acrididae)" . Genetica 68, no. 2 (1986) : 87-95.
http://dx.doi.org/10.1007/BF02424404
---------- MLA ----------
Confalonieri, V.A., Bidau, C.J. "The B-chromosomes of two species of Cylindrotettix (Leptysminae, Acrididae)" . Genetica, vol. 68, no. 2, 1986, pp. 87-95.
http://dx.doi.org/10.1007/BF02424404
---------- VANCOUVER ----------
Confalonieri, V.A., Bidau, C.J. The B-chromosomes of two species of Cylindrotettix (Leptysminae, Acrididae). Genetica. 1986;68(2):87-95.
http://dx.doi.org/10.1007/BF02424404