Abstract:
The karyotype of Baccharis coridifolia DC., a dioecious diploid species consists of 16 chromosomes with median (m) and 2 with submedian centromeric positions (sm) (2n = 18). Meiotic analyses of 219 male plants belonging to 12 populations showed across a wide geographical range one quadrivalent and seven bivalents in all of them. The quadrivalent involves the four biggest m chromosomes and probably constitutes a sex multivalent carrying in tight linkage the sex genes and provides a mechanism whereby permanent translocation heterozygosity is maintained. In metaphase I alternate orientation of the quadrivalent was predominant (85.71 %). Fourteen megaspore mother cells were analyzed and did not show the quadrivalent. A model for the origin and maintenance of the sexual translocation system is presented. It is assumed that there are two non-allelic factors M and n; M would be a dominant female suppresor and n a recessive male-suppresor. The excess of male plants observed in several populations at different localities might result from heterotic effects of some gene complexes carried by the translocation. This excess probably ensures a good supply of pollen for the vagaries of insect pollination at flowering time.
Registro:
Documento: |
Artículo
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Título: | Permanent translocation heterozygosity in dioecious Baccharis coridifolia DC. (Asteraceae) |
Autor: | Hunziker, J.H.; Wulff, A.F.; Escobar, A. |
Filiación: | Instituto de Botanica Darwinion, C. C. 22 San Isidro, B1642HYD Buenos Aires, Argentina Departamento de Ciencias Biologicas, Fac. de Ciencias Exactas y Naturales, Buenos Aires, Argentina
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Palabras clave: | allele; article; Asteraceae; centromere; chromosome; chromosome bivalent; chromosome translocation; controlled study; diploidy; dominant gene; flowering; genetic linkage; geographic distribution; heterozygosity; karyotype; meiosis; metaphase; nonhuman; plant insect interaction; pollen; pollen mother cell; pollination; population genetics; recessive gene; sex ratio; suppressor gene; Asteraceae; Chromosomes, Plant; Heterozygote; Translocation, Genetic; Asteraceae; Baccharis; Embryophyta; Insecta |
Año: | 2002
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Volumen: | 137
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Número: | 2
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Página de inicio: | 132
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Página de fin: | 139
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DOI: |
http://dx.doi.org/10.1034/j.1601-5223.2002.01610.x |
Título revista: | Hereditas
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Título revista abreviado: | Hereditas
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ISSN: | 00180661
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CODEN: | HEREA
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PDF: | https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00180661_v137_n2_p132_Hunziker.pdf |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00180661_v137_n2_p132_Hunziker |
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Citas:
---------- APA ----------
Hunziker, J.H., Wulff, A.F. & Escobar, A.
(2002)
. Permanent translocation heterozygosity in dioecious Baccharis coridifolia DC. (Asteraceae). Hereditas, 137(2), 132-139.
http://dx.doi.org/10.1034/j.1601-5223.2002.01610.x---------- CHICAGO ----------
Hunziker, J.H., Wulff, A.F., Escobar, A.
"Permanent translocation heterozygosity in dioecious Baccharis coridifolia DC. (Asteraceae)"
. Hereditas 137, no. 2
(2002) : 132-139.
http://dx.doi.org/10.1034/j.1601-5223.2002.01610.x---------- MLA ----------
Hunziker, J.H., Wulff, A.F., Escobar, A.
"Permanent translocation heterozygosity in dioecious Baccharis coridifolia DC. (Asteraceae)"
. Hereditas, vol. 137, no. 2, 2002, pp. 132-139.
http://dx.doi.org/10.1034/j.1601-5223.2002.01610.x---------- VANCOUVER ----------
Hunziker, J.H., Wulff, A.F., Escobar, A. Permanent translocation heterozygosity in dioecious Baccharis coridifolia DC. (Asteraceae). Hereditas. 2002;137(2):132-139.
http://dx.doi.org/10.1034/j.1601-5223.2002.01610.x