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The glycine-rich domain proteins ( GRDP ) have been functionally implicated in the cell wall structure, biotic, and abiotic stress responses. However, little is known about  GRDP  genes in female gametophyte development of  Arabidopsis . This study shows that  GRDP2 , a  GRDP , plays a crucial role in female gametophyte development. In  GRDP2  overexpression lines,  grdp2-3 , the embryo sacs were arrested at FG1 and no nucleus stages. Furthermore, callose staining shows that cell plate formation during megasporogenesis is disturbed in  grdp2-3 . In contrast, the pollen development is not affected in  grdp2-3 . The expression patterns of auxin-specific marker lines in female gametophytes showed that the auxin distribution and transport were significantly changed during megagametogenesis in  grdp2-3 . In addition, compared with the membrane-localized pattern of  PIN1 ,  PIN2 , and  PIN7  in WT, the signals were detected in the cytoplasm in  grdp2-3 . Together, our data suggest that  GRDP2  plays an essential role in auxin-mediated female gametophyte development.

The Glycine-Rich Domain Protein GRDP2 Regulates Ovule Development via the Auxin Pathway in Arabidopsis