Abstract: During the study on microspore formation and its development in Ginkgo biloba L. the authors have noticed in DAPI stained squashed specimen, some abnormal chromosomal arrangements appeared in metaphase Ⅰ and metaphase Ⅱ. There were also some chromosomal bridges in telophase Ⅰ and Ⅱ and some micronuclei in tetrads too. One of the five observed trees even has abnormality frequency as high as 6.5 %. These micronucleus-contained cells could subsequently become sterile. Study of such diversities, when referred to that in paleobotany may provide insight into the evolution trends of this species.

Key words: Ginkgo biloba, Microspore, Micronucleus