Summary Statement
Pollen coat lipids play essential roles in pollen-stigma interaction. Mutation of tapetal-derived KCS proteins (KCS7, KCS15 and KCS21) affects pollen hydration and tube growth. A critical point of tapetal-derived lipids in pollen coat is required for pollen hydration.
Key words: pollen coat, lipid, 3-ketoacyl-coenzyme A synthase, pollen hydration