First evidence of sex chromosome pre-reduction in male meiosis in the Miridae bugs (Heteroptera)

被引:18
作者
Grozeva, S
Nokkala, S
Simov, N
机构
[1] Bulgarian Acad Sci, Inst Zool, Sofia 1000, Bulgaria
[2] Univ Turku, Dept Biol, Genet Lab, FIN-20014 Turku, Finland
[3] Bulgarian Acad Sci, Natl Museum Nat Hist, Sofia 1000, Bulgaria
来源
FOLIA BIOLOGICA-KRAKOW | 2006年 / 54卷 / 1-2期
关键词
Macrolophus costalis; Miridae; Heteroptera; holokinetic chromosomes; achasmatic male meiosis; sex chromosome pre-reduction;
D O I
10.3409/173491606777919166
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The karyotype and male meiosis of Macrolophus costalis Fieber (Insecta, Heteroptera, Miridae) were studied using C-banding, AgNOR-banding and DNA sequence specific fluorochrome staining. The chromosome formula of the species is 2n=28(24+X1X2X3Y). Male meiotic prophase is characterized by a prominent condensation stage. At this stage, two sex chromosomes, "X" and Y are positively heteropycnotic and always appeared together, while in autosomal bivalents homologous chromosomes were aligned side by side along their entire length, that is, meiosis is achiasmatic. At metaphase 1, "X" and Y form a pseudobivalent and orient to the opposite poles. At early anaphase 1, the "X" chromosome disintegrates into three separate small chromosomes, X-1, X-2, and X-3. Hence both the autosomes and sex chromosomes segregate reductionally in the first anaphase, and separate equationally in the second anaphase. This is the first evidence of sex chromosome pre-reduction in the family Miridae. Data on C-heterochromatin distribution and its composition in the chromosomes of this species are discussed.
引用
收藏
页码:9 / 12
页数:4
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