Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 73, Issue -, Pages 405-411Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2013.10.027
Keywords
Arabidopsis thaliana; Abiotic stress; Plastic-specific ribosomal protein; Ribosome function; RNA-binding protein
Categories
Funding
- Mid-career Researcher Program through the National Research Foundation of Korea
- Ministry of Education, Science, and Technology [2011-0017357]
- Next-Generation BioGreen 21 Program, Rural Development Administration, Republic of Korea [PJ00820303]
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Plastids possess a small set of proteins unique to plastid ribosome, named plastid-specific ribosomal proteins (PSRPs). Among the six PSRPs found in Arabidopsis thaliana, PSRP2 is unique in that it harbors two RNA-recognition motifs found in diverse RNA-binding proteins. A recent report demonstrated that PSRP2 is not essential for ribosome function and plant growth under standard greenhouse conditions. Here, we investigated the functional role of PSRP2 during Arabidopsis seed germination and seedling growth under different light environments and various stress conditions, including high salinity, dehydration, and low temperature. The transgenic Arabidopsis plants overexpressing PSRP2 showed delayed germination compared with that of the wild-type plants under salt, dehydration, or low temperature stress conditions. The T-DNA insertion psrp2 mutant displayed better seedling growth but PSRP2-overexpressing transgenic plants showed poorer seedling growth than that of the wild-type plants under salt stress conditions. No noticeable differences in seedling growth were observed between the genotypes when grown under different light environments including dark, red, far-red, and blue light. Interestingly, the PSRP2 protein possessed RNA chaperone activity. Taken together, these results suggest that PSRP2 harboring RNA chaperone activity plays a role as a negative regulator in seed germination under all three abiotic stress conditions tested and in seedling growth of Arabidopsis under salt stress but not under cold or dehydration stress conditions. (C) 2013 Elsevier Masson SAS. All rights reserved.
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