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<p>FER protein kinases present in the ovule control the production of highly reactive derivatives of oxygen called <a href="page.php?w=reactive_oxygen_species">reactive oxygen species</a> (ROS). ROS levels have been shown via <a href="page.php?w=Green_fluorescent_protein">GFP</a> to be at their highest during floral stages when the ovule is the most receptive to pollen tubes, and lowest during times of development and following fertilisation. High amounts of ROS activate calcium ion channels in the pollen tube, causing these channels to take up</p><p>
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