NADPH oxidase activity in pollen tubes is affected by calcium ions, signaling phospholipids and Rac/Rop GTPases
Reactive oxygen species (ROS) generated by NADPH oxidase (NOX) are crucial for tip
growth of pollen tubes. However, the regulation of NOX activity in pollen tubes remains
unknown. Using purified plasma membrane fractions from tobacco and olive pollen and
tobacco BY-2 cells, we demonstrate that pollen NOX is activated by calcium ions and low
abundant signaling phospholipids, such as phosphatidic acid and phosphatidylinositol 4, 5-
bisphosphate in vitro and in vivo. Our data also suggest possible synergism between Ca2+ …
growth of pollen tubes. However, the regulation of NOX activity in pollen tubes remains
unknown. Using purified plasma membrane fractions from tobacco and olive pollen and
tobacco BY-2 cells, we demonstrate that pollen NOX is activated by calcium ions and low
abundant signaling phospholipids, such as phosphatidic acid and phosphatidylinositol 4, 5-
bisphosphate in vitro and in vivo. Our data also suggest possible synergism between Ca2+ …
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