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Pathogenesis-related proteins (PR proteins) play crucial roles in the plant defense system. A novel PRP gene was isolated from highly resistant soybean infected with  Phytophthora sojae  ( P .  sojae ) and was named  GmPRP  (GenBank accession number: KM506762). The amino acid sequences of GmPRP showed identities of 74%, 73%, 72% and 69% with PRP proteins from  Vitis vinifera ,  Populus trichocarpa ,  Citrus sinensis  and  Theobroma cacao , respectively. Quantitative real-time reverse transcription PCR (qRT-PCR) data showed that the expression of  GmPRP  was highest in roots, followed by the stems and leaves.  GmPRP  expression was upregulated in soybean leaves infected with  P .  sojae . Similarly,  GmPRP  expression also responded to defense/stress signaling molecules, including salicylic acid (SA), ethylene (ET), abscisic acid (ABA) and jasmonic acid (JA). GmPRP was localized in the cell plasma membrane and cytoplasm. Recombinant GmPRP protein exhibited ribonuclease activity and significant inhibition of hyphal growth of  P .  sojae  1  in vitro . Overexpression of the  GmPRP  gene in T 2  transgenic tobacco and T 2  soybean plants resulted in enhanced resistance to  Phytophthora nicotianae  ( P .  nicotianae ) and  P .  sojae  race 1, respectively. These results indicated that the GmPRP protein played an important role in the defense of soybean against  P .  sojae  infection.

plos one

Isolation and Characterization of a Novel Pathogenesis-Related Protein Gene (GmPRP) with Induced Expression in Soybean (Glycine max) during Infection with Phytophthora sojae