Pollen morphology of 15 species in nine genera of the Hydrocharitaceae

doi:10.7523/j.issn.2095-6134.2002.6.002

›› 2002, Vol. 40 ›› Issue (6): 490-500.DOI: 10.7523/j.issn.2095-6134.2002.6.002

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Pollen morphology of 15 species in nine genera of the Hydrocharitaceae

SUN Kun, CHEN Jia-Kuan, ZHANG Zhi-Yun

Received:1900-01-01 Revised:1900-01-01 Online:2002-11-10
Contact: SUN Kun

Abstract

Abstract:

Pollen morphology of 15 species in nine genera of Hydrocharitaceae was examined with

light microscope (LM), scanning electron microscope (SEM) and transmission electron microscope

(TEM). The pollen grains are usually inaperturate, spheroidal to subellipsoidal in shape, but those

of Stratiotes aloides and Halophila ovalis are monosulcate. The ornamentation of exine is spinulose

with tuberculae, verrueae, granules or rugulae on pollen surface under SEM. The exine is composed

of three indistinct layers, e.g. tectum, columellae and foot layer, but the columellae are only

slightly developed. Some characters, such as the size of pollen grain, shape and length of spinules

and wall structure are of some systematic value. The treatment of Stratiotes and Hydrilla as inde-

pendent tribes respectively is supported. The ornamentation and structure of exine in the Hydrochari-

taceae are similar to those in the Alismataceae, Aponogetonaceae and Butomaceae, but the presence

of inaperturate pollen grains in most taxa of Hydrocharitaceae shows its affinity with Najadales.

Key words: Hydrocharitaceae, Pollen morphology, Systematics

SUN Kun, CHEN Jia-Kuan, ZHANG Zhi-Yun. Pollen morphology of 15 species in nine genera of the Hydrocharitaceae[J]. , 2002, 40(6): 490-500.

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Pollen morphology of 15 species in nine genera of the Hydrocharitaceae

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