Akademik Veri Yönetim Sistemi
Acta Agrobotanica, cilt.74, ss.1-17, 2021 (ESCI)
he role of manganese in pollen germination and pollen tube growth. Pollen
germination was adversely affected by the presence of manganese (>10−8 M),
whereas low concentrations (10−12–10−10 M) stimulated the process. Manganese
caused morphological anomalies during tube growth, characterized by irregular
pollen tube thickening and swollen tips. e main effect was the anomalous cell
wall formation at the tip, in which the presence of several organelles reduced the
number of secretory vesicles. A loose network of fibrillar material and spherical
aggregates, mostly in the tip region, was detected, and this material was
progressively loosened into the surrounding medium. As a response to potential
toxicity, the excess manganese was isolated in vacuoles, which formed an internal
barrier against penetration of manganese to the tip area. Elevated manganese
concentrations might affect plant reproduction, resulting in anomalies in gamete
development. Consequently, the loss in genetic diversity and decreased fruit set
ultimately lower yield.