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J Integr Plant Biol
Plasma membrane H+-ATPases-mediated cytosolic proton gradient regulates pollen tube growth
Wei Chen1, Peng-Fei Jia1, Wei-Cai Yang1,2* and Hong-Ju Li1*
1State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, the Chinese Academy of Sciences, Beijing 100101, China
2College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

*Correspondences:
Email: : Hong‐Ju Li (hjli@genetics.ac.cn, Dr. Li is fully responsible for the distribution of the materials associated with this article); Wei‐Cai Yang (wcyang@genetics.ac.cn)
doi: 10.1111/jipb.12981
Abstract

The polar growth of pollen tubes is essential for the delivery of sperm cells during fertilization in angiosperms. How this polar growth is regulated has been a long‐standing question. An in vitro pharmacological assay previously implicated proton flux in pollen tube growth, although genetic and cellular supporting evidence was lacking. Here, we report that protons form a gradient from the pollen tube tip to the shank region and this gradient is generated by three members of Arabidopsis H+ATPases (AHAs). Genetic analysis suggested that these AHAs are essential for pollen tube growth, thus providing new insight into the regulation of polar growth.

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Received: 06 June 2020      Accepted:    Online on:10 June 2020
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