J Integr Plant Biol. ›› 1988, Vol. 30 ›› Issue (6): -.

• Research Articles •    

The Cytological Studies on Albuminous Cells in Secondary Phloem of Pinus bungeana

Gao Xin-zeng, Chen Yao-tang, Tan Jing and Xie Hong   

Abstract: This paper emphatically deals with the ultrastructure of albuminous cells in different stages of development in the secondary phloem of Pinus bungeana. The secondary phloem of Pinus bungeana is composed of sieve cells, axial parenchyma cells, radial plates and rays. Among the constituents, most of upright ray cells and radial plate parenchyma cells are albuminous cells. Although the shape and distribution of this kind of albuminous cells may be different, they possess the following common cytological characteristics. These cells have dense cytoplasm with abundant mitochondria, ribosomes, rough endoplasmic reticula and a large nucleus, the nuclei of some albuminous cells are lobed in shape which increases the outer surface of the nuclei. Usually the albuminous cell contains some starch granules, the quantity of the starch granules in albuminous cells is less than the other parenchyma cells of the secondary phloem. All these cytological characteristics suggest that albuminous cells are active physiologically. The distinguishing characteristics of albuminous cells from other parenchyma ceils are that the albuminous cells are associated with sieve cells through unilateral sieve area and they died together with the sieve cells.

Key words: Pinus bungeana, Phloem, Albuminous cell

Editorial Office, Journal of Integrative Plant Biology, Institute of Botany, CAS
No. 20 Nanxincun, Xiangshan, Beijing 100093, China
Tel: +86 10 6283 6133 Fax: +86 10 8259 2636 E-mail: jipb@ibcas.ac.cn
Copyright © 2022 by the Institute of Botany, the Chinese Academy of Sciences
Online ISSN: 1744-7909 Print ISSN: 1672-9072 CN: 11-5067/Q
备案号:京ICP备16067583号-22