A study on cytotaxonomy of Sect. Anguinum of Allium

Abstract

Abstract:

Allium Sect. Anguinum G. Don (Liliaceae) includes five species and three vari-

eties. The results of investigation on 23 local populations, representing five species and one

variety of this section, are as follows: (1) In this section, the basic chromosome number is

x＝8, and the karyotypes of all the species belong to 2A type. All the populations have simi-

lar metaphase chromosomes. The similar karyotypical features support the viewpoint that

Sect. Anguinum is a natural taxon. (2) Despite the fact that the karyotypicat features appear

to be similar, karyotypical differences exist in some populations within the same species or

among the species. First, there are various levels of ploidy. Second, the occurrence, number

and shape of B chromosomes are variable among the populations. Third, as for the satellite

chromosomes, there is a polymorphism in occurrence of the tandem satellites. (3) Highly

sterile triploid of Allium ovalifolium has a kind of stolon and expands population by vegeta

tive propagation. (4) According to widely geographical distribution and relatively old geolog-

ical history of the geographical area, A. victorialis is considered as a primitive species in this

section. This species, by means of geographical (gradual) speciation, has evolved step by

step to the other species. (5) According to the geographical distribution and evolutionary

process of Sect. Anguinum, it is proposed that the region from the Hengduan Mountains to

the Qingling Range of China be the center of present distribution and differentiation of the

section.

Key words: Allium, Sect. Anguinum, Karyotype, Polyploid, B chromosome, Intraspecif-

JING Wang-Chun, XU Jie-Mei, YANG Lei. A study on cytotaxonomy of Sect. Anguinum of Allium[J]. .

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A study on cytotaxonomy of Sect. Anguinum of Allium

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