LAMPBRUSH AND MITOTIC CHROMOSOMES OF THE HEMICLONALLY REPRODUCING HYBRID RANA-ESCULENTA AND ITS PARENTAL SPECIES

被引:43
作者
BUCCI, S
RAGGHIANTI, M
MANCINO, G
BERGER, L
HOTZ, H
UZZELL, T
机构
[1] UNIV ILLINOIS, DEPT ECOL ETHOL & EVOLUT, URBANA, IL 61801 USA
[2] UNIV ILLINOIS, MUSEUM NAT HIST, URBANA, IL 61801 USA
[3] POLISH ACAD SCI, DEPT AGR BIOL & FORESTRY, PL-60809 POZNAN, POLAND
来源
JOURNAL OF EXPERIMENTAL ZOOLOGY | 1990年 / 255卷 / 01期
关键词
D O I
10.1002/jez.1402550107
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
Mitotic chromosomes of the European water frogs Rana ridibunda and Rana lessonae, the parental species of Rana esculenta, differ significantly in their centromeric regions: when C‐banded or when made fluorescent, the centromeres of R. ridibunda (and of the ridibunda chromosomes in R. esculenta) are visible as a conspicuous dark granule or as a conspicuous fluorescent spot; the centromeres of R. lessonae (and of the lessonae chromosomes in R. esculenta) are inconspicuous or not fluorescent. Lampbrush chromosomes of these three taxa are described in detail for the first time; those of R. ridibunda and R. lessonae differ significantly in morphostructural characters such as conspicuousness of centromeres and number, form, and location of giant loops as well as in chiasma frequency. Chromosomes of the two parental species can thus be distinguished when present in lampbrush complements of hybrids. Reproduction in both sexes of natural R. esculenta lineages is hemiclonal: only the unrecombined genome of one parental species, usually R. ridibunda, is transmitted to haploid gametes (hybridogenesis). In 18 hybrids from natural populations of Poland, somatic tissues had allodiploid complements with chromosomes from each parental species. In contrast, spermatocytes I of five males and oocytes I of seven of eight females (221 of 222 oocytes) were autodiploid and contained only R. ridibunda chromosomes that formed n bivalents. These 12 hybrids thus were hybridogenetic. A single female hybrid had oocytes I (33 of 34) with genomes of both parental species; they showed various disturbances including tetraploidy, reduced number of chiasmata, and incomplete synapsis resulting in univalents. This individual thus was not hybridogenetic. The irregular lampbrush patterns indicate that such hybrids will have severely reduced fertility and most of their successful gametes will result in allotriploid progeny. Copyright © 1990 Wiley‐Liss, Inc., A Wiley Company
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页码:37 / 56
页数:20
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