【摘要】 松香草(Silphium perfoliatum, 2n=14)全部染色体着丝点和第5及第7对染色体短臂端部显示稳定的Ag-带。第1,2和6对染色体长臂居间区各有一居间带呈不稳定银染正反应。推测第5和第7对染色体为NOR染色体NOR分别位于两对染色体短臂末端。更多还原

【Abstract】 All centromeres and the short arm ends of the 5th and the 7th pair of chromosmoes in root-tip cells of Silphium perfoliatum showed stable Ag-bands-when staining with 75% AgNO3, whereas intercalary Ag-bands on the long arms of the 1st, 2nd and 6th chromosomes were unstable. There were maximally 4 nucleoli in interphase nucleus. It is inferred that the 5th and 7th chromosomes are NOR-chromosomes, NORS are located at the ends of the four chromosomes.更多还原