J Integr Plant Biol. ›› 1995, Vol. 37 ›› Issue (1): -.

• Research Articles •    

The Development and Structure of the Generative Cell Wall in Polygonatum simizui

Luo Yu-ying and Hu Shi-yi   

Abstract: The developmental structure and components of the generative cell wall in Polygonatum sirnizui Kitag were studied by means of cytochemical and electron microscope observation. The early generative cell wall separating the generative and vegetative cytoplasm contains callose and cellulose. From the time when the generative cell detaches from the intine untill it is freely suspended in the cytoplasm of the vegetative cell, the wall becomes progressively thinner and does not show the specific fluorescence when stained with aniline blue and cai- cofluor white although it remains PAS positive. At later developmental stage when the generative cell moves into the pollen tube but before its initiation of mitosis, an envelope with weak PAS positive reaction appears on the surface of the cell. Its morphological nature is similar to that of the sperm cell discribed as the "periplasm”. This study proves that a cell wall is present in the generative cell of Polygonatum simizui throughout the developmental process, althrough changes in structure and components of the wall may occur. The properties of the generative cell wall at different stages, its significance in differentiation between generative and vegetative cytoplasm and translocation of nutrient materials, and the possible mechanism of the detachment of the generative cell from the intine are the subjects to discussion.

Key words: Generative cell wall, Development, Polygonatum simizui

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