Exine Export in Pollen

Chapter
Part of the Signaling and Communication in Plants book series (SIGCOMM, volume 22)

Abstract

Pollen as a sperm cell carrier is mainly protected by outer pollen wall (called exine) from physical and biological stresses. The major composition of exine is the highly resistant biopolymer sporopollenin, which mainly consists of hydrophobic lipids, phenylpropanoids, and aromatic compounds. The biosynthesis of these constituents has been shown to be catalyzed by enzymes preferentially expressed in the sporophytic tapetal layer, a nutritive tissue supporting pollen development. How the synthesized sporopollenin precursors are exported from tapetal cells onto the surface of microspore for pollen exine formation remains largely unknown. Here, we review the structure of tapetal cella and pollen exine in the model monocot rice (Oryza sativa) and the model dicot Arabidopsis thaliana. In addition, we highlight the update understanding on the role of ATP-binding cassette (ABC), lipid transfer protein (LTP), and multidrug and toxic efflux (MATE) transporters in trafficking of sporopollenin precursors across tapetal cells for exine development in rice and Arabidopsis. We also discuss the future research focus on the transport of sporopollenin precursors for exine synthesis.

Notes

Acknowledgments

We thank Dr. Jianxin Shi for comments and reading on this chapter. This work was supported by funds from National Natural Science Foundation of China Grants 31230051, 30971739, 31270222 and 31110103915; China Innovative Research Team, Ministry of Education; 111 Project (B14016).

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghaiChina
  2. 2.Department of Botany and Plant SciencesUniversity of CaliforniaRiversideUSA

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