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The Golgi apparatus in Tradescantia pollen undergoes marked morphological changes during development of the pollen grains (Maruyama 1965). It consists of hundreds of tiny dictyosomes scattered randomly throughout the cytoplasm. These dictyosomes grow, mature and degenerate synchronously during the pollen devel opment. Namely, young dictyosomes are composed of a few, concentrically arranged ring form of cisternae. These ring dictyosomes are growing, and the num ber of the cisternae increases. The ring dictyosomes transform themselves by open-out of the ring cisternae to stacks of straight and parallel cisternae. These mature dictyosomes, then, produce secretory vesicles at the cost of the cisternae, and degenerate. In the present study, we have investigated the cytochemical aspects of the Golgi apparatus during the course of development. Recent advances of cytochemical staining methods enable us to localize polysaccharides in the cell at the ultrastruc tural level (Pease 1966, Pickett-Heaps 1967, Rambourg 1967, Thiery 1967, Ram bourg et al. 1969). Enzyme cytochemistry has demonstrated that phosphatases such as TPPase (thiamine pyrophosphatase), IDPase (inosine diphosphatase) and acid phosphatase are localized in the Golgi apparatus of variety of animal cells (Allen and Slater 1961, Novikoff and Goldfischer 1961, Novikoff et al. 1962, Allen 1963, Goldfischer et al. 1964, Novikoff 1964, Otero-Vilardebo et al. 1964, and others) and plant cells (Poux 1967, Dauwalder et al. 1969, Zaar and Schnepf 1969). Present report deals with polysaccharides and two phosphatases, TPPase and IDPase. Cytochemical studies of enzymes demonstrate only a fraction of the total activity. The absence of staining can not be interpreted as demonstrating the absence of enzyme activity. Despite the limitations in the techniques, however, the data indicate some correlations of changes in the phosphatase activities and the syn thesis of polysaccharides with the morphological modifications of the Golgi ap paratus.

Localization of Polysaccharides and Phosphatases in the Golgi Apparatus of <i>Tradescantia</i> Pollen