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Transcriptomic characterization of soybean (Glycıne max) roots ın response to rhizobium infection by RNA sequencıng

Qingyuan He, Hongyan Yang, Zhengpeng Li, Songhua Wang, Changwei Zhu and Shoucheng Huang

Legumes interacting with rhizobium to convert N2 into ammonia for plant use has attracted worldwide interest. However, the plant basal nitrogen fixation mechanisms induced in response to Rhizobium, giving differential gene expression of plants, have not yet been fully realized. The differential expressed genes of soybean between inoculated and mock-inoculated were analyzed by a RNA-Seq. The results of the sequencing were aligned against the Williams 82 genome sequence, which contain 55787 transcripts; 280 and 316 transcripts were found to be up- and down-regulated, respectively, for inoculated and mock-inoculated soybean roots at stage V1. Gene ontology (GO) analyses detected 104, 182 and 178 genes associated with the cell component category, molecular function category and biological process category, respectively. Pathway analysis revealed that 98 differentially expressed genes (115 transcripts) were involved in 169 biological pathways. We selected 19 differentially expressed genes and analyzed their expressions in mock-inoculated, inoculated USDA110 and CCBAU45436 using qRT-PCR. The results were in accordance with those obtained from rhizobia infected RNA-Seq data. These showed that the results of RNA-Seq had reliability and universality. Additionally, this study showed some novel genes associated with the nitrogen fixation process in comparison to previously identified QTLs.

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