江南油杉和台湾油杉核型的比较研究

<正> 江南油杉(Keteleeria cyclolepis Flous)和台湾油杉(Keteleeria formcsana Hayata)均为松科(Pinaceae)油杉属的常绿乔木,我国的特产树种,前者分布于云南、贵州、广西、广东、湖南,江西等省区,后者分布于台湾。油杉属(keteleeria)的细胞学资料已有Sugihara和王伏雄分别报道过铁坚油杉(K.dayidiana Beissn.)和云南油杉(K.

A COMPARATIVE KARYOTYPE ANALYSIS OF KETELEERIA CYCLOLEPIS FLOUS AND KETELEERiA FORMOSONA HAYATA

Ketclcerin cyclohpis Flous ( Pinaceae ) is a timber tree endemic to China. The chromosome count and karyotype of the species is reported here for the first time. The photomicrographs of the chromosome complements and idiogram of the karyotype are given in Fig, 1 and 2 respectively. Measurements in microns of the chromosomes are given in Table 1- I .The somatic chronscsomes in root tip cell have been found to be 24 with median and submedian constrictions. According to the terminolcgy defined ty Levan et al., the karyotype formula is K( 2n) = 24 = 18(M) + 6 sm, which is generally regarded as a rather primitive one, and belongs to "2 A" type of Stebtins' karyotypic symmetry .Upon a comparison of the karyotype cf keteleeria cyclolepis with that of K. formosana Hayata (Table 1-II ), which was investigated by Kuo et al. , it has been found that the latter belongs to "2B" type cf karyctypic symmetry and therefore a more advanced one than the former.