Studies on the Pollen Morphology of Trapa from Zhejiang

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Studies on the Pollen Morphology of Trapa from Zhejiang

Ding Bing-Yang, Fang Yun-Yi, Zhang Hui-Ming, Liang Hong, Zhao Lie

Received:1900-01-01 Revised:1900-01-01 Online:1991-03-10 Published:1991-03-10
Contact: Ding Bing-Yang

Abstract

Abstract:

In the present work, pollen grains of 9 species of Trapa L. from Zhejiang were ex-

amined under LM and SEM. They are subsphaeroidal or subprolate, obtuse-triangular in

polar view, elliptic or subrounded in equatorial view, and 3-colpate. In the equatorial area,

there are three ridge-shaped appendages which elongates along apertures toward two poles

and ultimately combined, the ornamentation of other part of exine is minute-verrucate. The

genus Trapa is uniform in shape of pollen grains, type and position of apertures and

ornamentation of exine, while differentiation can be found in size of pollen grains and shape

of ridge-shaped appendage. All of these provide valuable evidence for the classification of

Trapa and the verification of their affinities. The validity of Trapaceae, the evolutionary

trends of pollen morphology and the affinities of some species are discussed in this paper.

Key words: Pollen morphology, Trapa, Zhejiang, China

Ding Bing-Yang, Fang Yun-Yi, Zhang Hui-Ming, Liang Hong, Zhao Lie. Studies on the Pollen Morphology of Trapa from Zhejiang[J]. .

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