The Morphological Variation and the Karyotypical Characters of Dendranthema indicum and D. lavandulifolium

Abstract

Abstract:

Dendranthema indicum L. and D. lavandulifolium (Fisch. ex Trautv. )

Ling et Shih are two species which are greatly variable in morphology. The

specimens collected from different habitats show distinct variation in characters

such as leaf division、 leaf pubescence、 size of capitula and number of capitula.

Some authors (Li 1983; Du 1989; Nakata 1987)have studied the chromosome

numbers and karyotypes of D. indicum and D. lavandulifolium and reported the

basic chromosome number and polyploidy of these two species. But some ques-

tions, such as the patterns and trends of morphological variation, the relation-

ships between morphological and karyotypical variations and the phylogenetic

relationship between D. indicum and D. lavandulifolium remain unclear . Based

on wide field investigation and cultivation experiments, the present authors made

a thorough study on D. indicum and D. lavandulifolium from morphology、

cytology with reference to geographical distribution and habit conditions. The re-

sults show that the amount of leaf pubescence of D. indicum is closely related to

the water content in its habitat; the diameter of capitula decreases, while the

number of capitula of D. lavandulifolium increases with the increase in elevation.

Comparing the karyotypical constitution of different populations of D. indicum

and D. lavandulifolium, the authors infer that natural hybridization, both

intraspecific hybridization and hybridization between D. indicum and D.

lavandulifolium, has played an important role in the origin of polyploids and in

the evolutionary process of karyotypes of D. indicum and D. lavandulifolium.

By a synthetic analysis from morphology, cytology and geography, the authors

also suggest that D. indicum and D. lavandulifolium be sister species,

derived from a common ancestor, and it is unreasonable to consider one of them

evolved from the other.

Key words: D. indicum, D. lavandulifolium, Morphological variation, Karyotype

Wang Jin-wu, Yang Ji, Li Mao-xue. The Morphological Variation and the Karyotypical Characters of Dendranthema indicum and D. lavandulifolium[J]. .

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The Morphological Variation and the Karyotypical Characters of Dendranthema indicum and D. lavandulifolium

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