Karyotype Analysis in Lycoris longituba Y. Hsu et Fan

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Karyotype Analysis in Lycoris longituba Y. Hsu et Fan

Hsu Ping-Sheng, Huang Shao-Fu, Mao Zong-Guo, Yu Zhi-Zhou, Lin Jin-Zhen

Received:1900-01-01 Revised:1900-01-01 Online:1984-02-18 Published:1984-02-18
Contact: Hsu Ping-Sheng

Abstract

Abstract:

A karyotypic analysis of Lycoris longituba Y. Hsu et Fan was carried

out. The voucher specimen, Z. G. Mao 10501, is preserved in the Herbarium of Hangchow

Botanical Garden. The chromosome number in root tip cells of the species is found for the

first time to be 16, among which 6 are large, V-shaped with submedian primary constric-

tions, and the other 10 are short, rod-shaped with terminal primary constrictions. Photomi-

crograph of the chromosome complement and idiogram are given in Fig. 1-3 respectively.

The karyotype formula of the species is therefore 2n=16=6m+6t+4t (SAT) in the light

of the chromosomal terminology defined by Levan and al.^[5]

Based on the view stressed by Jones^[3] and Brandham^[4], successive fusion of the ch-

romosomes should be taken as the essential mechanism for karyotype evolution and specia-

tion in Lycoris. Reciprocal translocation, with the loss of one of the centromeres, might be

the mechanism of origin for a V chromosome. It is, then, suggested that the decrease in ch-

romosome number as a result of fusion of the rods with terminal or subterminal primary

constrictions has taken place in the speciation of L. longituba.

Key words: Lycoris, L.longituba, Karyotype

Hsu Ping-Sheng, Huang Shao-Fu, Mao Zong-Guo, Yu Zhi-Zhou, Lin Jin-Zhen. Karyotype Analysis in Lycoris longituba Y. Hsu et Fan[J]. .

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Karyotype Analysis in Lycoris longituba Y. Hsu et Fan

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