ibclogo XVI International Botanical Congess

Abstract Number: 5419
Poster No. = 878


KARYOTYPE ANALYSIS IN SCHISANDRACEAE AND THE PRELIMINARY EVALUATION ON ITS SYSTEMATIC SIGNIFICANCE


Cheng-ren Sun* and Cheng-bin Chen^, *Sichuan Teacher's College, Nanchong, Sichuan, ^Nankai University, Tianjin, People's Republic of China


11 samples of 5 populations belonging to 2 species (Schisandra sphenanthera Rehd. & Wils. and S. glaucescens Diels) and 1 variety (S. propinqua (Wall) Baill. var. sinensis Oliv.) were examined cytologically. Not only counted their chromosome number but also analysed their karyotype (ß-karyology). All of the 11 samples have the same chromosome number and N.F value: 2n=2x=28.N.F=56. They have two karyotypes: 1A and 2A, according to Stebbins' standard of karyotype classification (1971). However, these two karyotypes do not occur in different species but in the same population of S. sphenanthera and one of the populations of S. glaucescens simultaneously. This will be undoubtedly a serious challenge to the systematic study of Schisandraceae. Besides, sex chromosomes of S. glaucescens were found. They are a pair of sat-chromosomes. This is the first time for the sex chromosome of Schisandraceae to be reported.

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