LOSS OF NUCLEOLAR-ORGANIZER REGIONS DURING POLYPLOID EVOLUTION IN SCILLA-AUTUMNALIS

被引：58

作者：

VAUGHAN, HE

JAMILENA, M

REJON, CR

PARKER, JS

GARRIDORAMOS, MA

机构：

[1] UNIV LONDON,QUEEN MARY & WESTFIELD COLL,SCH BIOL SCI,LONDON E1 4NS,ENGLAND

[2] UNIV GRANADA,FAC CIENCIAS,DEPT GENET,E-18071 GRANADA,SPAIN

来源：

HEREDITY | 1993年 / 71卷

关键词：

ALLOPOLYPLOIDS; IN SITU HYBRIDIZATION; NUCLEOLAR DOMINANCE; NUCLEOLAR-ORGANIZERS;

D O I：

10.1038/hdy.1993.181

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

The organization and behaviour of nucleolar-organizer regions (NOR) of Scilla autumnalis were studied in two diploid races, their allotetraploid and autoallohexaploid derivatives and hybrids between them. The diploids of genome constitution AA and (BB7)-B-7 each have a pair of nucleolar-organizer chromosomes while the polyploids AAB(7)B(7) and AAB(7)B(7)B(7)B(7) only carry visible organizers on the B-7 chromosomes. In situ hybridization using ribosomal probe pTA71 was used to localize ribosomal cistrons. In polyploids the sites of hybridization are limited to the B-7-derived nucleolar-organizer chromosomes and ribosomal cistrons have thus been deleted from the A genome. A NOR-associated C-band has also been deleted.

引用

页码：574 / 580

页数：7

共 27 条

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