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The anther cuticle, which is mainly composed of lipid polymers, functions as physical barriers to protect genetic material intact; however, the mechanism of lipid biosynthesis in maize ( Zea mays. L. ) anther remains unclear. Herein, we report a male sterile mutant,  male sterile 305  ( ms305 ), in maize. It was shown that the mutant displayed a defective anther tapetum development and premature microspore degradation. Three pathways that are associated with the development of male sterile, including phenylpropanoid biosynthesis, biosynthesis of secondary metabolites, as well as cutin, suberine, and wax biosynthesis, were identified by transcriptome analysis. Gas chromatography-mass spectrometry disclosed that the content of cutin in  ms305  anther was significantly lower than that of fertile siblings during the abortion stage, so did the total fatty acids, which indicated that  ms305  mutation might lead to blocked synthesis of cutin and fatty acids in anther. Lipidome analysis uncovered that the content of phosphatidylcholine, phosphatidylserine, diacylglycerol, monogalactosyldiacylglycerol, and digalactosyldiacylglycerol in  ms305  anther was significantly lower when compared with its fertile siblings, which suggested that  ms305  mutation disrupted lipid synthesis. In conclusion, our findings indicated that  ms305  might affect anther cuticle and microspore development by regulating the temporal progression of the lipidome in maize.

Male sterile 305 Mutation Leads the Misregulation of Anther Cuticle Formation by Disrupting Lipid Metabolism in Maize