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Among various abiotic stress factors, soil salinity decreases the photosynthetic rate, growth, and yield of plants. Recentl y, many genes have been reported to enhance salt tolerance. The objective of this study was to characterize the Brassica rapaSalt Stress Resistance ( BrSSR) gene, of which the function was unclear, although the full-length sequence was known. To characterize the role of BrSSR, a B. rapa Chinese cabbage inbred line (‘CT001’) was transformed with pSL94 vector containing the full len gth BrSSR cDNA. Quantitative real-time polymerase chain reaction (qRT-PCR) analysis showed that the expression of BrSSR in the transgenic line was 2.59-fold higher than that in the wild type. Analysis of phenotypic characteristics showed that plants overexpressing BrSSR were resistant to salinity stress and showed normal growth. Microarray analysis of BrSSR over-expressing plants confirmed that BrSSR was strongly associated with ERD15 (AT2G41430), a gene encoding a protein containing a PAM2 motif (AT4G14270), and GABA-T (AT3G22200), all of which have been a ssociated with salt tolerance, in the co-expression network of genes related to salt stress. The results of this study indicate that BrSSR plays an important role in plant growth and tolerance to salinity.Additional key words:

Characterization and Gene Co-expression Network Analysis of a Salt Tolerance-related Gene, BrSSR, in Brassica rapa