作 者 ：Xie Xiao-Yang, Gu Zhi-Jian, Wu Quan-An
期 刊 ：植物分类学报 1992年 6期
Keywords:
Abstract:
The somatic cells of 12 taxa of the genera Nomocharis, Lilium,
Fritillaria and Cardiocrinum from north-western Yunnan were karyomorphologically
studied. The 12 taxa are similar to each other in chromosomal morphology at
the resting nucleus stage, which belongs to the complex chromocenter type. They
are also similar to each other in morphology of mitotic prophase chromosomes,
which belongs to the interstitial type. Their chromosome numbers are all 2n = 24,
and centromeric terminalization values range from 79.9- 82.2%. The above
results show that the four genera have close relationships. These 12 taxa,
however, exhibit some similarities and differences in the position of secondary
constrictions seemingly showing the karyological characters of each genus in the
area. Firstly, on m(sm)-chromosomes, secondary constrictions close to
centromeres appear stable in one of pairs in both Nomocharis( 6 taxa) and
Lilium (4 taxa); In Cardiocrinum giganteum, they were found distant from
centromeres on short arms in one of pairs; None was observed in Fritillaria
cirrhosa. Secondly, on st (t)- chromosomes, remarkable secondary constrictions
were generally found on long arms in Nomocharis, C. giganteum, F. cirrhosa
and the high mountain habitants of Lilium, such as L. souliei, while they were
always observed on short arms in L. nepalense, L. taliense and L. brownii,
which grow in the lower altitude region. So the Nomocharis and high mountain
members of Lilium have similary distribution of secondary constrictions, and they
are considered to be most closely related.