A Revaluation of the Systematic Positions of the Cercidiphyllaceae and Daphniphyllaceae Based on rbc L Gene Sequence Analysis, with Reference to the Relationship in the “Lower” Hamamelidae

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A Revaluation of the Systematic Positions of the Cercidiphyllaceae and Daphniphyllaceae Based on rbc L Gene Sequence Analysis, with Reference to the Relationship in the “Lower” Hamamelidae

FENG Yu-Xing, WANG Xiao-Quan, PAN Kai-Yu, HONG De-Yuan

Received:1900-01-01 Revised:1900-01-01 Online:1998-09-10 Published:1998-09-10
Contact: FENG Yu-Xing

Abstract

Abstract:

The rbcL gene sequences of six species representing five subfamilies of the

Hamamelidaceae and the Platanaceae were determined and used in the phylogenetic analysis

on the “lower” Hamamelidae sensu Endress (1989) and its allies newly suggested. Four most

parsimonious trees were obtained, all having 893 steps with CI = 0. 558 and RI = 0. 591.

The families Cercidiphyllaceae, Daphniphyllaceae, Hamamelidaceae and Saxifragaceae are

closely located, while the relationships among them remain unsolved even if more representa-

tives of the Hamamelidaceae were further added in this parsimony analysis. Our results con-

firm the phylogenetic trees revealed by Chase et al. (1993) and Soltis et al. (1997), instead

of those of Hoot and Crane (1996). Considering the morphological features they share, it is

suggested that the Cercidiphyllaceae and Daphniphyllaceae be placed into the Hamamelidales.

The relationship between the Platanaceae and the Hamamelidaceae shown in our analysis is

not so closed as suggested by the cladistic analyses by using morphological characters only(e.

g. Lu et al., 1991), while those among the Platanaceae, Trochodendraceae and Tetracen-

traceae are close as indicated by this study. The Eupteleaceae falls into the Ranunculales.

The Eucommiaceae seems to show closer relationship with the Hamamelidaceae, the “core”

family of the “lower” Hamamelidae, than with the other members except the Cercidiphyl-

laceae. The rbcL gene trees imply that the “lower” Hamamelidae is a heterogeneous group,

composed of isolated ancient families.

Key words: The “lower” Hamamelidae, Cercidiphyllaceae, Daphniphyllaceae, MolecularPhylogeny, rbcL gene

FENG Yu-Xing, WANG Xiao-Quan, PAN Kai-Yu, HONG De-Yuan. A Revaluation of the Systematic Positions of the Cercidiphyllaceae and Daphniphyllaceae Based on rbc L Gene Sequence Analysis, with Reference to the Relationship in the “Lower” Hamamelidae[J]. .

[1]	WANG Xiao-Quan, LI Zhen-Yu. The Application of Sequence Analysis of rDNA Fragment to the Systematic Study of the Subfamily Cyrtandroideae (Gesneriaceae) [J]. , 1998, 36(2): 97-105.
[2]	Wang Xiao-quan, Han Ying, Deng Zheng-rong, Hong De-yuan. Phylogeny of the Pinaceae Evidenced By Molecular Biology [J]. , 1997, 35(2): 97-106.
[3]	Zhang Zhi-Yun, Lu An-Ming. On the Systematic Position of Daphniphyllaceae [J]. , 1989, 27(1): 17-26.

A Revaluation of the Systematic Positions of the Cercidiphyllaceae and Daphniphyllaceae Based on rbc L Gene Sequence Analysis, with Reference to the Relationship in the “Lower” Hamamelidae

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