Coiled Pollen Tubes (image) Brown University Caption With the proper genes disabled, pollen tubes coiling in the ovule of plants don't burst to release their pollen. Instead, they just keep coiling. Credit Johnson lab/Brown University Usage Restrictions With credit. Higher res available. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.