. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. »* •'•> 26 t ^ 28 30 FIGURES 25-30. Chlamydomonas microhalophila. Photomicrographs of living cells, except Figure 27. FIGURE 25, mature cell just prior to division; note contractile vacuoles. FIGURE 26, immature cell, median optical section; note unilateral pyrenoid and chromatophore thick- ness. FIGURE 27, cell treated with I2-KI, showing flagella. FIGURE 28, rotation of protoplast prior to cleavage. FIGURE 29, beginning of second cleavage. FIGURE 30, maturing zygote. Cytology As in many species of Chlamydomonas, the pro
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. »* •'•> 26 t ^ 28 30 FIGURES 25-30. Chlamydomonas microhalophila. Photomicrographs of living cells, except Figure 27. FIGURE 25, mature cell just prior to division; note contractile vacuoles. FIGURE 26, immature cell, median optical section; note unilateral pyrenoid and chromatophore thick- ness. FIGURE 27, cell treated with I2-KI, showing flagella. FIGURE 28, rotation of protoplast prior to cleavage. FIGURE 29, beginning of second cleavage. FIGURE 30, maturing zygote. Cytology As in many species of Chlamydomonas, the protoplast rotates 90° within the wall prior to cell division. Cytokinesis in this species is initiated by the appearance of a furrow in the region of the nucleus, and opposite the position of the pyrenoids or dividing pyrenoid (Fig. 20). The first division occurs perpendicular to the longitudinal axis of the cell. This coincides with the description given by Kater (1929) for C. nasuta, Akins (1941) for Carteria cnicifcm. Bold (1949) for C. chlamydogama, and by Buffaloe (1958) for four species of Chlamydomonas. The two daughter cells usually undergo one more division which takes place in the same manner (Figs. 23 and 29). Cytokinesis is unilateral in the cytoplasm surrounding the nucleus (Figs. 20 and 23). Buffaloe (1958) reported that for four species of Chlamydomonas he studied, there was no exact synchrony between the division of the nucleus and the division of the pyrenoid. The same is true for the present organism, but there is synchrony between division of the pyrenoid and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richa
Size: 1662px × 1503px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
