Abstract
The primexine formation and plasma membrane undulation are the crucial steps of pollen wall formation in many angiosperms. However, the molecular mechanism underlining these processes is largely unknown. In Arabidopsis, NEW ENHANCER OF ROOT DWARFISM1 (NERD1), a transmembrane protein, was reported to play pleiotropic roles in plant development including male fertility control; while, how NERD1 disruption impacts male reproduction is yet unclear. Here, we revealed that the male sterility of nerd1 mutants is attributed to defects in early steps of pollen wall formation. We found that nerd1-2 is void of primexine formation and microspore plasma membrane undulation, defective in callose deposition. Consequently, sporopollenin precursors are unable to deposit and assemble on the microspore surface, but instead accumulated in the anther locule and tapetal cells, and ultimately leading to microspore abortion. NERD1 is localized in the Golgi and is expressed in both vegetative and reproductive organs, with the highest expression in reproductive tissues, including the tapetum, male meiocytes, tetrads and mature pollen grains. Our results suggest that NERD1 is required for the primexine deposition and microspore plasma membrane undulation, thus essential for sporopollenin assembly and pollen exine formation.
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The gene sequence of NERD1 is available in the tair website (http://www.arabidopsis.org/) under accession number AT3G51050. The supporting data of the article is included within the article and its additional files.
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Acknowledgements
We are grateful to the Salk Genomic Analysis Laboratory for providing the T-DNA mutants seeds. The authors thank Wanwan Zhu, Ruifeng Fu and Lu Zhu for their help in TEM analysis. We thank Staffan Persson (University of Melbourne) for helpful comments and advice.
Funding
This research was supported by the National Key Research and Development Program of China (2016YFD0100903); the National Natural Science Foundation of China (U19A2031, 31670309, 31900611); China Innovative Research Team, Ministry of Education, and the Programme of Introducing Talents of Discipline to Universities (111 Project, B14016); JSPS KAKENHI Grant (JP19H05362).
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WQL, DBZ and DWX were involved in the design of the experiments and analyzed the data. DWX and PCM performed the experiments. IS helped for the immunolocalization experiment. DWX, DBZ, JXS and WQL wrote the manuscript. All authors have read, edited and approved publication of the present paper.
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Xu, D., Mondol, P.C., Ishiguro, S. et al. NERD1 is required for primexine formation and plasma membrane undulation during microsporogenesis in Arabidopsis thaliana. aBIOTECH 1, 205–218 (2020). https://doi.org/10.1007/s42994-020-00022-1
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DOI: https://doi.org/10.1007/s42994-020-00022-1