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Tapetal 3-Ketoacyl-Coenzyme A synthases are involved in pollen coat lipid accumulation for pollen-stigma interaction in Arabidopsis
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  • Zaibao Zhang,
  • Huadong Zhan,
  • Jieyang Lu,
  • Shuangxi Xiong,
  • Naiying Yang,
  • Hongyu Yuan,
  • Zhong-Nan Yang
Zaibao Zhang
Xinyang Normal University
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Huadong Zhan
Shanghai Normal University
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Jieyang Lu
Shanghai Normal University
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Shuangxi Xiong
Shanghai Normal University
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Naiying Yang
Shanghai Normal University
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Hongyu Yuan
Xinyang Normal University
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Zhong-Nan Yang
Shanghai Normal University
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Abstract

Pollen coat lipids form an outer barrier to protect pollen itself and play essential roles in pollen-stigma interaction. However, the precise molecular mechanisms underlying pollen coat lipids production, deposition, regulation and function during anther development remain largely elusive. 3-ketoacyl-coenzyme A synthases (KCS) are involved in fatty acid elongation or very long chain fatty acid (VLCFA) synthesis. Here, we identified six members of Arabidopsis KCS family expressed in anther. Of them, KCS7, KCS15 and KCS21 express in tapetal cells at stages 8-10. Further analysis demonstrated that they act downstream of Male sterility1 (MS1), a regulator for late tapetum development. The kcs7/15/21 triple-mutant is fertile. Both cellular observation and lipid staining showed pollen coat lipid was decreased in triple mutant. After landing on stigma, the wild-type pollen was hydrated in about 5 min while the triple mutant pollen took about 10 min. Pollen tube growth of the triple mutant was also delayed. These results demonstrate the pathway in tapetum to produce pollen coat lipid, and reveal the roles of tapetal-derived pollen coat lipid for pollen-stigma interaction.