Abstract
When calcium carbonate crystals are formed in mulberry (Morus abla) idioblasts, they are deposited in newly formed cell wall sacs. The initial cytological events leading to cell wall sac formation were observed in the distal end of young idioblasts and tentatively categorized into four stages. The first indication of formation was the separation of the innermost cell wall layer from the cell wall, which is followed by the deposition of egg-shaped polysaccharide on the inner cell wall surface. The size of the deposit area increased, while the thickness of the cell wall significantly decreased during the next stage. Finally, the condensed cellulosic lamella was invaginated into the deposition area, resulting in the formation of an elongated cell wall sac. The internal cell wall sac was composed of numerous fibers with different morphologies. Application of gelatin-methenamine-silver staining allowed us to observe the spatial distribution of cellulosic polysaccharides as electron-dense images.
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