The pollen tube clear zone: clues to the mechanism of polarized growth.

@article{Hepler2015ThePT,
  title={The pollen tube clear zone: clues to the mechanism of polarized growth.},
  author={Peter K Hepler and Lawrence J Winship},
  journal={Journal of integrative plant biology},
  year={2015},
  volume={57 1},
  pages={79-92}
}
Pollen tubes usually exhibit a prominent region at their apex called the "clear zone" because it lacks light refracting amyloplasts. A robust, long clear zone often associates with fast growing pollen tubes, and thus serves as an indicator of pollen tube health. Nevertheless we do not understand how it arises or how it is maintained. Here we review the structure of the clear zone, and attempt to explain the factors that contribute to its formation. While amyloplasts and vacuolar elements are… CONTINUE READING