Transcriptome analysis reveal the mechanism of susceptible wheat seedlings response to Puccinia striiformis f. sp.

Abstract

Background Wheat (Triticum aestivum L.) is most widely cultivated and a major staple food crops in the world. Stripe rust caused by Puccinia striiformis f. sp. tritici (Pst), which significantly reduce yield and quality of wheat. Although some resistant genes have been successfully used in wheat breeding, large of the regulating networks and the underlying molecular mechanisms of Pst response remains unknown. Therefore, to identify differentially expressed genes (DEGs) and regulate network involved in Pst resistance, we sequenced 15 cDNA libraries constructed from wheat seedlings with CYR34 infection.Results In this study, a highly susceptible cv. Chuanyu12 (CY12) were used to study the transcriptome profiles after inoculated with Pst physiological race CYR34. A total of 13892, 10195, 12268 and 14044 DEGs were investigated at 24h, 48h, 72h and 7days Pst infection, respectively. Certain key genes and pathways responsible for Pst-CYR34 in CY12 were identified. The results revealed that Pst-CYR34 inhibited the DEGs related to energy metabolism, biosynthesis, carbon fixation, phenylalanine metabolism, and plant hormone signaling pathway after Pst inoculation at 24h, 48h, 72h and 7d. These down-regulated DEGs including light-harvesting chlorophyll protein complex in photosystem I and photosystem II; cytochrome b6/f/ complex, F-type ATPase and photosynthetic electron transport; ethylene, jasmonic acid (JA) and salicylic acid (SA); lignin and flavonoids biosynthesis in CY12. Quantitative Real-time PCR analysis verified the expression patterns of these DEGs.Conclusions Our results give insights into the foundation for further exploring the molecular mechanism regulating networks of Pst response and pave the way for durable resistant breeding in bread wheat.