A Comparative study on pollen exine ultrastructure of Nothofagus and the other genera of Fagaceae

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A Comparative study on pollen exine ultrastructure of Nothofagus and the other genera of Fagaceae

ZHENG Zhong-Hua, WANG Ping-Li, PU Fa-Ding

Received:1900-01-01 Revised:1900-01-01 Online:1999-05-10 Published:1999-05-10
Contact: ZHENG Zhong-Hua

Abstract

Abstract:

The genus Nothofagus is mainly distributed in South America and New Zealand.

The present paper describes its pollen exine ultrastructure and compares the exine ultrastruc-

ture with that of the other genera of Fagaceae. The pollen grains were examined using ultra-

thin sectioning technique under transmission electron microscope. The study shows that the

pollen exine ultrastructure of Nothofagus differs from that of the other genera of Fagaceae by

its exine structure and thickness, type of aperture, and ornamentation. The pollen exine of

Nothofagus is thin and possesses granular bacules, regular foot layer and tectum, spinulate

ornamentation, and the endexine is usually visible at poral area, and 5～8 colpate. The pollen

exine of the other genera of Fagaceae possesses entire bacules, irregular foot layer and tec-

tum, granulate and tuberculate ornamentation, thicker endexine, and is 3-colporate ( 3-colpate

or 3-colporoidate). The pollen exine ultrastructure of Nothofagus may belong to primitive

type. The pollen exine ultrastructure data support Kuprianova’s opinion that Nothofagus

should be separated from Fagaceae and established as a monogenetic family, i.e. Nothofa-

gaceae.

Key words: Nothofagus, Fagaceae, Pollen exine, Ultrastructure

ZHENG Zhong-Hua, WANG Ping-Li, PU Fa-Ding. A Comparative study on pollen exine ultrastructure of Nothofagus and the other genera of Fagaceae[J]. .

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A Comparative study on pollen exine ultrastructure of Nothofagus and the other genera of Fagaceae

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