Pollinia Morphology of 14 Species in Dendrobium(Orchidaceae) and Taxonomic Significance

doi:10.7525/j.issn.1673-5102.2021.01.003

Abstract

Abstract:

The morphology and exine sculpture of pollinia in 14 species of Dendrobium Sw.(Orchidaceae) were investigated using stereoscope and scanning electron microscope in order to provide evidence for classification and systematic evolution of this genus. Under stereomicroscope, the anther is composed of 4 clavated pollinia with a golden, oily, waxy surface and a hard texture in 14 Dendrobium species. According to the general appearance, Dendrobium pollinia observed can be divided into 3 shapes(heart-shaped, nearly heart-shaped and long heart-shaped) and 4 types(extremely small pollinia, small pollinia, large pollinia and oversize pollinia). Based on the curvature of the boundary contour of a pollinium, it can be divided into four types(crescent-like, bow-like, stick-like and rice grain-like). There are 5 kinds of exine sculptures(psilate; psilate with threads; psilate-uneven,coarse reticulate and rugulate) under scanning electron microscope, as well as two types of crystals observed on the surface of pollinia in D.wislsonii Rolfe and D.thyrsiflorum Rchb. The morphology and exine sculpture of pollinia were distinguished in different species of Dendrobium, which is of some significance to its taxonomic clarification.

Key words: Orchidaceae, Dendrobium, pollinia morphology, exine sculpture, taxonomy

CLC Number:

S682.31

Yan-Ping WANG, Lu LI, Chen-Xuan YANG, Yan LUO, Qing-Qing LI. Pollinia Morphology of 14 Species in Dendrobium(Orchidaceae) and Taxonomic Significance[J]. Bulletin of Botanical Research, 2021, 41(1): 12-25.

Figures/Tables 1

References 43

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