Cytological Studies of the Genus Nomocharis and Its Related Genera

Abstract

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.

Key words: Liliaceae, Nomocharis, Lilium, Cardiocrinum giganteum, Fritillaria cirrhosa, Karyotype

Xie Xiao-Yang, Gu Zhi-Jian, Wu Quan-An. Cytological Studies of the Genus Nomocharis and Its Related Genera[J]. .

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Cytological Studies of the Genus Nomocharis and Its Related Genera

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