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Karyotypes of two species of {\sl Cycas} from China

Qin Guangquan, Nian Liu

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Abstract

Chromosome numbers and of the two Cycas species from China are all 2n=2x=22, and the karyotypes are classified to be 3B according to stebbin's category. The karyotype formulas are 2n=2x=22=4m+2sm+4st+12T for C.hainanensis, and 2n=2x=22=2m+4sm+4st+12T for C.szechuanensis subsp. fairylakea. The two karyotypes are reported for the first time. The results support that Cycas can be divided into two groups based on the chromosome data.

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What this paper is about

Chromosome numbers and of the two Cycas species from China are all 2n=2x=22, and the karyotypes are classified to be 3B according to stebbin's category. The karyotype formulas are 2n=2x=22=4m+2sm+4st+12T for C.hainanensis, and 2n=2x=22=2m+4sm+4st+12T for C.szechuanensis subsp. fairylakea. The two karyotypes are reported for the first time. The results support that Cycas can be divided into two groups based on the chromosome data.

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Available abstract

Chromosome numbers and of the two Cycas species from China are all 2n=2x=22, and the karyotypes are classified to be 3B according to stebbin's category. The karyotype formulas are 2n=2x=22=4m+2sm+4st+12T for C.hainanensis, and 2n=2x=22=2m+4sm+4st+12T for C.szechuanensis subsp. fairylakea. The two karyotypes are reported for the first time. The results support that Cycas can be divided into two groups based on the chromosome data.

Key concepts: Karyotype, Biology, Botany, Chromosome, Chromosome number, Zoology, Genetics, Gene

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