Morphological Studies on Circaeaster agrestis Maxim. (1) Process of Embryolo gical Development

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Morphological Studies on Circaeaster agrestis Maxim. (1) Process of Embryolo gical Development

Hu Zheng-Hai, Yang Jing

(Department of Biology, North-western University, Xi'an)

Received:1900-01-01 Revised:1900-01-01 Online:1987-10-18 Published:1987-10-18
Contact: Hu Zheng-Hai

Abstract

Abstract:

The present paper aims at discovering the characters of embryological development

of Circaeaster agrestis, which makes up a monotypic genus, Circaeaster, to establish the phylo-

genetic relationships of the genus. The different opinions on its systematic position among bo-

tanists are briefly explained.

The embryological studies show that the most important advanced characters of the genus

are as follows. The ovule is amphitropous, unitegmic and tenuinucelar; the embryo sac forma-

tion is in accordance with the Polygonum type; endosperm formation is of the cellular type, the

primary endosperm nucleus dividing to form two cells and the first wall vertical; embryo

formation follows the variation of the Caryophyllad type; at the early stage of development of

embryo, the integument has been already atrophied and at last disappeared, so that the seed coat

is absent in the mature fruit.

On the basis of the embryological and some morphological evidence, the authors consider

that a close relationship between the genus and Ranunculaceae and its related families seems to

be unlikely. The affinities of the genus Circaeaster are still uncertain.

Key words: Circaeaster agrestis, embryo, endosperm

Hu Zheng-Hai, Yang Jing. Morphological Studies on Circaeaster agrestis Maxim. (1) Process of Embryolo gical Development[J]. .

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Morphological Studies on Circaeaster agrestis Maxim. (1) Process of Embryolo gical Development

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