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Proteins with glycine-rich signatures have been reported in a wide variety of organisms including plants, mammalians, fungi, and bacteria. Plant glycine-rich protein genes exhibit developmental and tissue-specific expression patterns. Herein, we present the characterization of the  AtGRDP2  gene using Arabidopsis null and knockdown mutants and, Arabidopsis and lettuce over-expression lines.  AtGRDP2  encodes a short glycine-rich domain protein, containing a DUF1399 domain and a putative RNA recognition motif (RRM).  AtGRDP2  transcript is mainly expressed in Arabidopsis floral organs, and its deregulation in Arabidopsis  Atgrdp2  mutants and  35S::AtGRDP2  over-expression lines produces alterations in development. The  35S::AtGRDP2  over-expression lines grow faster than the WT, while the  Atgrdp2  mutants have a delay in growth and development. The over-expression lines accumulate higher levels of indole-3-acetic acid and, have alterations in the expression pattern of  ARF6 ,  ARF8 , and  miR167  regulators of floral development and auxin signaling. Under salt stress conditions,  35S::AtGRDP2  over-expression lines displayed higher tolerance and increased expression of stress marker genes. Likewise, transgenic lettuce plants over-expressing the  AtGRDP2  gene manifest increased growth rate and early flowering time. Our data reveal an important role for  AtGRDP2  in Arabidopsis development and stress response, and suggest a connection between  AtGRDP2  and auxin signaling.

Overexpression of AtGRDP2, a novel glycine-rich domain protein, accelerates plant growth and improves stress tolerance