A systematic study on the trib. Polygonateae (Liliaceae s. l.) with reference to the evidence from leaf abaxial epidermis and seed coat-文献传递-植物通论文库

作者：Lü Hai-Liang, WU Shi-An, YANG Ji, RAO Guang-Yuan

期刊：植物分类学报 2000年 1期

Abstract:

The morphological features of leaf abaxial epidermis and micromorphological features of

testa were observed in the tribe Polygonateae(Liliaceae, s. l. ). Seventy nine species from 7 genera

of Polygonateae and 15 species from 12 genera of related tribes were examined with light microscope

and SEM. In Polygonateae, the features of leaf and seed coat showed diversity in the genera Polyg-

onatum and Smilacina. According to the characteristics of the leaf abaxial epidermis and seed coat,

Polygonatum could be roughly categorized as two groups. One was characterized by the irregular

shape and the sinuate anticlinal wall of epidermal cells and the shallow pits on the testa, the other

was characterized by the rectangular or rhombic shape and the straight anticlinal wall of epidermal

cells and the ridge and reseau on the seed coat. In some plants of the two groups, the anticlinal wall

of epidermal cells was found to be curved rather than sinuate, and might be of an intermediate na-

ture. The leaf epidermis and seed coat showed common features among Disporopsis, Smilacina and

Polygonatum. The seed coat of Maianthemum was found to be of the same features as that of Smi-

lacina stellata and S. trifolia. Disporum possessed uniform leaf epidermical features, but the spe-

cies distributed in eastern Asia showed different features of seed coat from those in North America.

The features of leaf epidermis and seed coat were uniform within the genus Streptopus. S. ovalis

was indistinguishable from other species in the genus in the features of leaf epidermis and testa, thus

its position in the genus was confirmed. Streptopus, Disporum and Clintonia were quite different

from the remaining genera in the Polygonateae in the features of leaf epideimis and testa. The first

two genera showed resemblance to Tricyrtis and Uvularia of Uvulariaceae, and thus Dahlgren‘s

viewpoint that they should be moved to Uvulariaceae was corroborated. Among the outgroups stud-

ied, only Convallaria showed similarity to Polygonatae in the features of leaf epidermis and testa.

A systematic study on the trib. Polygonateae (Liliaceae s. l.) with reference to the evidence from leaf abaxial epidermis and seed coat