Scientific Journal

The Effect of Thermopriming on the Expression of Some Hub Genes in Nitrogen Metabolism and Evaluation of Regulatory Mechanism of These Genes in Rapeseed (Brassica napus L.)

Document Type : Original Article

Authors

Department of Plant Production and Genetics, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Iran

Abstract
The present study aimed to analyze in silico transcriptomic data to identify hub nitrogen assimilation genes (NAGs), regulatory factors, and further examined the effect of thermopriming on the expression of selected genes. After identifying hub genes with CytoHubba plugin, cis-regulatory elements (CRE) were investigated by using the Tomtom tool. In addition, interactions between hub nitrogen assimilation genes and rapeseed miRNAs were predicted using the psRNATarget tool. Codon usage bias (CUB) was analyzed in Rstudio. Finally, the expression of nitrate reductase (NR) and nitrite reductase (NiR) genes under thermopriming and recurrent heat stress was examined using qRT-PCR method. Bioinformatics analysis of the function of hub genes in the NAG interaction network confirmed their role in enhancing nitrogen use efficiency, especially under environmental stresses. Also, the function of various transcription factors, including Dof elements, in regulating the expression of nitrogen assimilation genes was confirmed, and the role of members of the miR156, miR395, miR6028, miR6034, and miR6035 families in regulating the expression of these genes was determined. The correlation study of CUB indices showed the role of mutation and natural selection in the formation of the codon pattern of the studied genes. Finally, the increased expression of NR and NiR genes under thermopriming compared to non-primed plants confirmed the importance of heat stress memory in enhancing nitrogen use efficiency in rapeseed. The findings of this study are an important step towards identifying effective components in engineering nitrogen metabolism and developing heat stress-tolerant varieties in rapeseed.

Keywords

Subjects


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