The pollen tube of Prunus avium (cherry) consists of a growth zone of vesicles at the tip and an assemblage of organelles typical of an actively metabolizing cell. Electron opaque globules are closely associated with the plasma membrane and fibrillar cell wall layer at the tip. Acid phosphatase (EC 3.1.3.2) activity is localized in the membranes of 120 nm vesicles and ER system, the lumen of 50 nm vesicles, the plasma membrane and the tube nucleus.
Proportions of cellular components in the midstylar transmitting tissue of Prunus avium L., sweet cherry, were determined using the point interception method on transmission electron micrographs. Changes were measured during the development of the style when comparing pistils collected 1 week before anthesis with unpollinated pistils at the anthesis stage. Transmitting tissue was also examined 20 h after cross- and self-pollination. The results illustrate complex patterns of cellular development including changes in vacuolation, cell wall – intercellular substances, and starch. Other cellular components were also quantified and are discussed. After pollination, further cell wall – intercellular substances increases occur but no differences were found between cross- and self-pollination.
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