Study in Female Plant Chromosome Ag-NOR of Ginkgo biloba
银杏雌株染色体Ag-NOR的研究 Study in Female Plant Chromosome Ag-NOR of Ginkgo biloba

In this paper, the Ag-NOR of somatic chromosomes of young ovulum in Ginkgo biloba was studied. It was found that the number of Ag-NORs (satellite) were four constantly, though there were two kinds in size, homoeotype and heterotype.So we considered that the number and morphology of NOR (satellite) can not bc used as identification markers of sex chromosome in Ginkgo biloba. In addi-tion, the heterozygosity and polymorphism of NOR are discussed.