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Arabidopsis exocyst subunit SEC3A has been reported to participate in embryo development. Here we report that  SEC3A  is involved during pollen germination. A T-DNA insertion in  SEC3A  leads to an absolute, male-specific transmission defect that can be complemented by the expression of  SEC3A  coding sequence from the  LAT52  promoter or  SEC3A  genomic DNA. No obvious abnormalities in the microgametogenesis are observed in the  sec3a/SEC3A  mutant, however,  in vitro  and  in vivo  pollen germination are defective. Further studies reveal that the callose, pectin, and cellulose are apparently not deposited at the germination site during pollen germination.  SEC3A  is expressed ubiquitously, including in pollen grains and pollen tubes. Notably, SEC3A-GFP fusion proteins are specifically recruited to the future pollen germination site. This particular localization pattern is independent of phosphatidylinositol 4,5-bisphosphate (PI-4,5P 2 ), although SEC3-HIS fusion proteins are able to bind to several phosphoinositols  in vitro . These results suggest that  SEC3A  plays an important role in the establishment of the polar site for pollen germination.

Exocyst subunit SEC3A marks the germination site and is essential for pollen germination in Arabidopsis thaliana